Diagenesis dan Mikrofasies Batupasir pada Formasi Lower Sihapas, Cekungan Sumatera Tengah.

LAMPIRAN

PETROGRAPHIC DATA SHEET

SAMPLE IDENTITY
Company
EMP
Well
A
Sample type
Core
Depth (ft)
5315,50
Formation
Lower Sihapas

GENERAL COMPOSITION
Particles
74,86
Other
0,00

Detrital Matrix
3,30
Replacement
1,30
Cements
15,20
Visibles pores
5,34
Total (%)
100,00

Rock Name

Sandstone

Classification

Sublitharenite (Pettijohn, 1975)

GRAIN COMPOSITION

%

Monocryst. Quartz
Straight extinction
Undolose extiction
Reworked

2,10
64,90
1,27

Feldspars
Potash Feldspars
Plagioclase
Rock Fragments
Igneous
(acid)
(basic)
Metamorphic

Polycrystalin qz
Low grade
Med grade
High grade
Sed. Rock fragments
Claystone
siltstone
Pyroclastic
Chert
Silisified grain
Accessory minerals
Glauconite
Carbonaceous mat.
Micas
Heavy minerals
Opaque minerals
Altered grain

2,05
1,34

1,10
0,00
0,70
0,30
0,00
0,00
0,00
0,00
0,00
0,00
0,00
1,40
0,00
0,70
0,00
0,00
0,00

GRAIN COMPOSITION

(Continued)
Carbonate grains
Clastic Lime, Bio, Physico Ch.
Intraclasts
Algal Stromatolites
Pellets
Oolites
Pisolites
Ooids

Skeletal grains
Red algae
Green algae
Blue green algae
Arenaceous forams
Planktonic forams
Small bent. Forams
Large Forams
Milliolids
Oncolites

Phylloid alga
Grapitolites
Corals
Bryozoan
Echinoderms
Brachiopods
Molluscs
Gastropods
Sponge
Indeterminate bioclasts
OTHERS
Pseudomatrix
Car. Sideritic lam. Clays
Carbon streak

// nikol

Grain size means
Grain size range
Sorting

Roundness
Grain contacts
Structure

%
0,00
0,00
0,00
0,00
0,00
0,00
0,00

0,00
0,00
0,00
0,00
0,00
0,00
0,00

0,00
0,00
0,00
0,00
0,00
0,00
0,00
0,00
0,00
0,00
0,00
0,00
0,00
%
0,00
0,00

x-nikol

TEXTURES

0,194 mm
0,109 – 0,572 mm
Well sorted
Angular – subangular
Suture > long
-

MATRIX
Detrital clays
Carbonate mud
Volcanic glass
CEMENTS
Indeterminate clays
Dolomite
Calcite
Micrite
Siderite
Pyrite
Kaolinite
Illite

Quartz overgrowth
Ferroan oxide
REPLACEMENT
Calcite
Micrite
siderite
Dolomite
Pyrite
Kaolinite
Zeolite
Indeterminate clays
Chlorite
Silica
POROSITY
Intergranular
Intragranular
Fracture
Micropore
Mouldic
Micro intercrystalin

Dissolution

%
1,10
2,20
0,00
%
0,00
8,90
1,70
1,20
0,00
1,10
0,60
0,00
1,70
0,00
%
0,00
0,00
0,00
0,00
1,30
0,00
0,00
0,00
0,00
0,00
%
1,13
0,00
1,86
0,00
0,00
0,00
2,35

PETROGRAPHIC DATA SHEET

SAMPLE IDENTITY
Company
EMP
Well
A
Sample type
Core
Depth (ft)
5319,50
Formation
Lower Sihapas

GENERAL COMPOSITION
Particles
68,20
Other
0,00
Detrital Matrix
3,50
Replacement
6,70
Cements
11,40
Visibles pores
10,20
Total (%)
100,00

Rock Name

Sandstone

Classification

Sublitharenite (Pettijohn, 1975)

GRAIN COMPOSITION

%

Monocryst. Quartz
Straight extinction
Undolose extiction
Reworked

0,90
58,40
0,30

Feldspars
Potash Feldspars
Plagioclase
Rock Fragments
Igneous
(acid)
(basic)
Metamorphic
Polycrystalin qz
Low grade
Med grade
High grade
Sed. Rock fragments
Claystone
siltstone
Pyroclastic
Chert
Silisified grain
Accessory minerals
Glauconite
Carbonaceous mat.
Micas
Heavy minerals
Opaque minerals
Altered grain

2,10
1,50

1,70
0,00
0,00
1,30
0,00
0,00
0,00
0,00
0,00
0,00
0,00
1,20
0,00
0,80
0,00
0,00
0,00

GRAIN COMPOSITION
(Continued)
Carbonate grains
Clastic Lime, Bio, Physico Ch.
Intraclasts
Algal Stromatolites
Pellets
Oolites
Pisolites
Ooids

Skeletal grains
Red algae
Green algae
Blue green algae
Arenaceous forams
Planktonic forams
Small bent. Forams
Large Forams
Milliolids
Oncolites
Phylloid alga
Grapitolites
Corals
Bryozoan
Echinoderms
Brachiopods
Molluscs
Gastropods
Sponge
Indeterminate bioclasts
OTHERS
Pseudomatrix
Car. Sideritic lam. Clays
Carbon streak

// nikol

Grain size means
Grain size range
Sorting
Roundness
Grain contacts
Structure

%
0,00
0,00
0,00
0,00
0,00
0,00
0,00

0,00
0,00
0,00
0,00
0,00
0,00
0,00
0,00
0,00
0,00
0,00
0,00
0,00
0,00
0,00
0,00
0,00
0,00
0,00
0,00
%
0,00
0,00

x nikol

TEXTURES
0,239 mm
0,125 – 0,537 mm
Moderately – well sorted
Angular – subangular
Point - suture
-

MATRIX
Detrital clays
Carbonate mud
Volcanic glass
CEMENTS
Indeterminate clays
Dolomite
Calcite
Micrite
Siderite
Pyrite
Kaolinite
Illite
Quartz overgrowth
Ferroan oxide
REPLACEMENT
Calcite
Micrite
siderite
Dolomite
Pyrite
Kaolinite
Zeolite
Indeterminate clays
Chlorite
Silica
POROSITY
Intergranular
Intragranular
Fracture
Micropore
Mouldic
Micro intercrystalin
Dissolution

%
1,40
2,10
0,00
%
0,00
5,80
1,40
1,20
0,00
1,10
0,00
0,00
1,90
0,00
%
2,90
0,70
0,00
0,00
0,60
2,50
0,00
0,00
0,00
0,00
%
2,90
0,00
0,00
0,00
1,90
0,00
5,40

PETROGRAPHIC DATA SHEET

SAMPLE IDENTITY
Company
EMP
Well
A
Sample type
Core
Depth (ft)
5322,00
Formation
Lower Sihapas

GENERAL COMPOSITION
Particles
69,30
Other
0,00
Detrital Matrix
4,20
Replacement
6,80
Cements
9,20
Visibles pores
10,50
Total (%)
100,00

Rock Name

Sandstone

Classification

Sublitharenite (Pettijohn, 1975)

GRAIN COMPOSITION

%

Monocryst. Quartz
Straight extinction
Undolose extiction
Reworked

1,70
59,70
0,50

Feldspars
Potash Feldspars
Plagioclase
Rock Fragments
Igneous
(acid)
(basic)
Metamorphic
Polycrystalin qz
Low grade
Med grade
High grade
Sed. Rock fragments
Claystone
siltstone
Pyroclastic
Chert
Silisified grain
Accessory minerals
Glauconite
Carbonaceous mat.
Micas
Heavy minerals
Opaque minerals
Altered grain

2,10
1,30

1,10
0,00
0,00
0,90
0,00
0,00
0,00
0,00
0,00
0,00
0,00
0,00
0,00
2,00
0,00
0,00
0,00

GRAIN COMPOSITION
(Continued)
Carbonate grains
Clastic Lime, Bio, Physico Ch.
Intraclasts
Algal Stromatolites
Pellets
Oolites
Pisolites
Ooids

Skeletal grains
Red algae
Green algae
Blue green algae
Arenaceous forams
Planktonic forams
Small bent. Forams
Large Forams
Milliolids
Oncolites
Phylloid alga
Grapitolites
Corals
Bryozoan
Echinoderms
Brachiopods
Molluscs
Gastropods
Sponge
Indeterminate bioclasts
OTHERS
Pseudomatrix
Car. Sideritic lam. Clays
Carbon streak

// nikol

Grain size means
Grain size range
Sorting
Roundness
Grain contacts
Structure

%
0,00
0,00
0,00
0,00
0,00
0,00
0,00

0,00
0,00
0,00
0,00
0,00
0,00
0,00
0,00
0,00
0,00
0,00
0,00
0,00
0,00
0,00
0,00
0,00
0,00
0,00
0,00
%
0,00
0,00

x nikol

TEXTURES
0,203 mm
0,294 – 0,539 mm
Well sorted
Angular – subrounded
Point – long
-

MATRIX
Detrital clays
Carbonate mud
Volcanic glass
CEMENTS
Indeterminate clays
Dolomite
Calcite
Micrite
Siderite
Pyrite
Kaolinite
Illite
Quartz overgrowth
Ferroan oxide
REPLACEMENT
Calcite
Micrite
siderite
Dolomite
Pyrite
Kaolinite
Zeolite
Indeterminate clays
Chlorite
Silica
POROSITY
Intergranular
Intragranular
Fracture
Micropore
Mouldic
Micro intercrystalin
Dissolution

%
3,10
1,10
0,00
%
0,00
4,70
1,20
1,30
0,00
0,90
0,60
0,00
1,10
0,00
%
0,70
0,50
0,00
0,20
1,10
4,30
0,00
0,00
0,00
0,00
%
4,30
0,00
0,00
0,00
1,50
0,00
5,30

PETROGRAPHIC DATA SHEET

SAMPLE IDENTITY
Company
EMP
Well
A
Sample type
Core
Depth (ft)
5326,00
Formation
Lower Sihapas

GENERAL COMPOSITION
Particles
49,50
Other
0,00
Detrital Matrix
4,00
Replacement
14,30
Cements
18,90
Visibles pores
13,30
Total (%)
100,00

Rock Name

Sandstone

Classification

Subarkose (Pettijohn, 1975)

GRAIN COMPOSITION

%

Monocryst. Quartz
Straight extinction
Undolose extiction
Reworked

1,50
39,50
0,30

Feldspars
Potash Feldspars
Plagioclase
Rock Fragments
Igneous
(acid)
(basic)
Metamorphic
Polycrystalin qz
Low grade
Med grade
High grade
Sed. Rock fragments
Claystone
siltstone
Pyroclastic
Chert
Silisified grain
Accessory minerals
Glauconite
Carbonaceous mat.
Micas
Heavy minerals
Opaque minerals
Altered grain

2,70
1,80

0,90
0,00
0,00
0,20
0,00
0,00
0,00
0,00
0,00
0,00
0,00
0,70
0,00
1,90
0,00
0,00
0,00

GRAIN COMPOSITION
(Continued)
Carbonate grains
Clastic Lime, Bio, Physico Ch.
Intraclasts
Algal Stromatolites
Pellets
Oolites
Pisolites
Ooids

Skeletal grains
Red algae
Green algae
Blue green algae
Arenaceous forams
Planktonic forams
Small bent. Forams
Large Forams
Milliolids
Oncolites
Phylloid alga
Grapitolites
Corals
Bryozoan
Echinoderms
Brachiopods
Molluscs
Gastropods
Sponge
Indeterminate bioclasts
OTHERS
Pseudomatrix
Car. Sideritic lam. Clays
Carbon streak

// nikol

Grain size means
Grain size range
Sorting
Roundness
Grain contacts
Structure

%
0,00
0,00
0,00
0,00
0,00
0,00
0,00

0,00
0,00
0,00
0,00
0,00
0,00
0,00
0,00
0,00
0,00
0,00
0,00
0,00
0,00
0,00
0,00
0,00
0,00
0,00
0,00
%
0,00
0,00

x nikol

TEXTURES
0,214 mm
0,193 – 0,592 mm
Well – moderately sorted
Angular – subrounded
Suture – long
-

MATRIX
Detrital clays
Carbonate mud
Volcanic glass
CEMENTS
Indeterminate clays
Dolomite
Calcite
Micrite
Siderite
Pyrite
Kaolinite
Illite
Quartz overgrowth
Ferroan oxide
REPLACEMENT
Calcite
Micrite
siderite
Dolomite
Pyrite
Kaolinite
Zeolite
Indeterminate clays
Chlorite
Silica
POROSITY
Intergranular
Intragranular
Fracture
Micropore
Mouldic
Micro intercrystalin
Dissolution

%
2,10
1,90
0,00
%
0,00
6,20
1,50
2,20
0,00
0,70
3,70
2,30
2,30
0,00
%
2,10
1,30
0,00
2,70
2,90
5,30
0,00
0,00
0,00
0,00
%
2,10
1,20
0,00
0,00
3,70
0,00
6,30

PETROGRAPHIC DATA SHEET

SAMPLE IDENTITY
Company
EMP
Well
A
Sample type
Core
Depth (ft)
5330,10
Formation
Lower Sihapas

GENERAL COMPOSITION
Particles
34,50
Other
0,00
Detrital Matrix
4,60
Replacement
17,40
Cements
32,50
Visibles pores
11,00
Total (%)
100,00

Rock Name

Sandstone

Classification

Subarkose (Pettijohn, 1975)

GRAIN COMPOSITION

%

Monocryst. Quartz
Straight extinction
Undolose extiction
Reworked

1,20
26,10
0,20

Feldspars
Potash Feldspars
Plagioclase
Rock Fragments
Igneous
(acid)
(basic)
Metamorphic
Polycrystalin qz
Low grade
Med grade
High grade
Sed. Rock fragments
Claystone
siltstone
Pyroclastic
Chert
Silisified grain
Accessory minerals
Glauconite
Carbonaceous mat.
Micas
Heavy minerals
Opaque minerals
Altered grain

2,10
1,70

1,10
0,00
0,00
0,70
0,00
0,00
0,00
0,00
0,00
0,00
0,00
0,20
0,00
1,20
0,00
0,00
0,00

GRAIN COMPOSITION
(Continued)
Carbonate grains
Clastic Lime, Bio, Physico Ch.
Intraclasts
Algal Stromatolites
Pellets
Oolites
Pisolites
Ooids

Skeletal grains
Red algae
Green algae
Blue green algae
Arenaceous forams
Planktonic forams
Small bent. Forams
Large Forams
Milliolids
Oncolites
Phylloid alga
Grapitolites
Corals
Bryozoan
Echinoderms
Brachiopods
Molluscs
Gastropods
Sponge
Indeterminate bioclasts
OTHERS
Pseudomatrix
Car. Sideritic lam. Clays
Carbon streak

// nikol

Grain size means
Grain size range
Sorting
Roundness
Grain contacts
Structure

%
0,00
0,00
0,00
0,00
0,00
0,00
0,00

0,00
0,00
0,00
0,00
0,00
0,00
0,00
0,00
0,00
0,00
0,00
0,00
0,00
0,00
0,00
0,00
0,00
0,00
0,00
0,00
%
0,00
0,00

x nikol

TEXTURES
0,243 mm
0,132 – 0,697 mm
Moderately
Angular – subrounded
Suture – long
-

MATRIX
Detrital clays
Carbonate mud
Volcanic glass
CEMENTS
Indeterminate clays
Dolomite
Calcite
Micrite
Siderite
Pyrite
Kaolinite
Illite
Quartz overgrowth
Ferroan oxide
REPLACEMENT
Calcite
Micrite
siderite
Dolomite
Pyrite
Kaolinite
Zeolite
Indeterminate clays
Chlorite
Silica
POROSITY
Intergranular
Intragranular
Fracture
Micropore
Mouldic
Micro intercrystalin
Dissolution

%
2,10
2,50
0,00
%
0,00
18,50
2,10
1,10
0,00
4,60
4,40
0,00
1,80
0,00
%
5,50
2,70
0,00
4,70
1,90
0,90
0,00
0,00
0,00
1,70
%
1,80
0,00
0,00
0,00
2,90
0,00
6,30

PETROGRAPHIC DATA SHEET

SAMPLE IDENTITY
Company
EMP
Well
A
Sample type
Core
Depth (ft)
5334,15
Formation
Lower Sihapas

GENERAL COMPOSITION
Particles
44,80
Other
0,00
Detrital Matrix
2,70
Replacement
18,10
Cements
25,80
Visibles pores
8,60
Total (%)
100,00

Rock Name

Sandstone

Classification

Sublitharenite (Pettijohn, 1975)

GRAIN COMPOSITION

%

Monocryst. Quartz
Straight extinction
Undolose extiction
Reworked

3,90
33,20
1,50

Feldspars
Potash Feldspars
Plagioclase
Rock Fragments
Igneous
(acid)
(basic)
Metamorphic
Polycrystalin qz
Low grade
Med grade
High grade
Sed. Rock fragments
Claystone
siltstone
Pyroclastic
Chert
Silisified grain
Accessory minerals
Glauconite
Carbonaceous mat.
Micas
Heavy minerals
Opaque minerals
Altered grain

1,20
0,90

0,90
0,00
0,00
0,90
0,00
0,00
0,00
0,00
0,00
0,00
0,00
1,20
0,00
1,10
0,00
0,00
0,00

GRAIN COMPOSITION
(Continued)
Carbonate grains
Clastic Lime, Bio, Physico Ch.
Intraclasts
Algal Stromatolites
Pellets
Oolites
Pisolites
Ooids

Skeletal grains
Red algae
Green algae
Blue green algae
Arenaceous forams
Planktonic forams
Small bent. Forams
Large Forams
Milliolids
Oncolites
Phylloid alga
Grapitolites
Corals
Bryozoan
Echinoderms
Brachiopods
Molluscs
Gastropods
Sponge
Indeterminate bioclasts
OTHERS
Pseudomatrix
Car. Sideritic lam. Clays
Carbon streak

// nikol

Grain size means
Grain size range
Sorting
Roundness
Grain contacts
Structure

%
0,00
0,00
0,00
0,00
0,00
0,00
0,00

0,00
0,00
0,00
0,00
0,00
0,00
0,00
0,00
0,00
0,00
0,00
0,00
0,00
0,00
0,00
0,00
0,00
0,00
0,00
0,00
%
0,00
0,00

x nikol

TEXTURES
0,198 mm
0,134 – 0,543 mm
Moderately sorted
Subangular < subrounded
Suture – long
-

MATRIX
Detrital clays
Carbonate mud
Volcanic glass
CEMENTS
Indeterminate clays
Dolomite
Calcite
Micrite
Siderite
Pyrite
Kaolinite
Illite
Quartz overgrowth
Ferroan oxide
REPLACEMENT
Calcite
Micrite
siderite
Dolomite
Pyrite
Kaolinite
Zeolite
Indeterminate clays
Chlorite
Silica
POROSITY
Intergranular
Intragranular
Fracture
Micropore
Mouldic
Micro intercrystalin
Dissolution

%
1,50
1,20
0,00
%
0,00
13,70
1,70
1,10
0,00
1,20
3,60
3,40
1,10
0,00
%
1,40
1,30
0,00
3,30
0,90
11,20
0,00
0,00
0,00
0,00
%
2,30
0,00
1,20
0,00
1,90
0,00
3,20

PETROGRAPHIC DATA SHEET

SAMPLE IDENTITY
Company
EMP
Well
A
Sample type
Core
Depth (ft)
5339,55
Formation
Lower Sihapas

GENERAL COMPOSITION
Particles
63,80
Other
0,00
Detrital Matrix
3,70
Replacement
5,40
Cements
10,40
Visibles pores
16,70
Total (%)
100,00

Rock Name

Sandstone

Classification

Sublitharenite (Pettijohn, 1975)

GRAIN COMPOSITION

%

Monocryst. Quartz
Straight extinction
Undolose extiction
Reworked

5,00
44,60
2,30

Feldspars
Potash Feldspars
Plagioclase
Rock Fragments
Igneous
(acid)
(basic)
Metamorphic
Polycrystalin qz
Low grade
Med grade
High grade
Sed. Rock fragments
Claystone
siltstone
Pyroclastic
Chert
Silisified grain
Accessory minerals
Glauconite
Carbonaceous mat.
Micas
Heavy minerals
Opaque minerals
Altered grain

1,90
0,70

3,20
0,00
0,30
1,70
0,00
0,00
0,00
0,00
0,00
0,00
0,00
2,30
0,00
1,80
0,00
0,00
0,00

GRAIN COMPOSITION
(Continued)
Carbonate grains
Clastic Lime, Bio, Physico Ch.
Intraclasts
Algal Stromatolites
Pellets
Oolites
Pisolites
Ooids

Skeletal grains
Red algae
Green algae
Blue green algae
Arenaceous forams
Planktonic forams
Small bent. Forams
Large Forams
Milliolids
Oncolites
Phylloid alga
Grapitolites
Corals
Bryozoan
Echinoderms
Brachiopods
Molluscs
Gastropods
Sponge
Indeterminate bioclasts
OTHERS
Pseudomatrix
Car. Sideritic lam. Clays
Carbon streak

// nikol

Grain size means
Grain size range
Sorting
Roundness
Grain contacts
Structure

%
0,00
0,00
0,00
0,00
0,00
0,00
0,00

0,00
0,00
0,00
0,00
0,00
0,00
0,00
0,00
0,00
0,00
0,00
0,00
0,00
0,00
0,00
0,00
0,00
0,00
0,00
0,00
%
0,00
0,00

x nikol

TEXTURES
0,314 mm
0,235 – 0,723 mm
Moderately
Subangular – rounded
Suture - long
-

MATRIX
Detrital clays
Carbonate mud
Volcanic glass
CEMENTS
Indeterminate clays
Dolomite
Calcite
Micrite
Siderite
Pyrite
Kaolinite
Illite
Quartz overgrowth
Ferroan oxide
REPLACEMENT
Calcite
Micrite
siderite
Dolomite
Pyrite
Kaolinite
Zeolite
Indeterminate clays
Chlorite
Silica
POROSITY
Intergranular
Intragranular
Fracture
Micropore
Mouldic
Micro intercrystalin
Dissolution

%
1,10
1,70
0,90
%
1,40
0,00
2,90
1,80
0,00
0,00
0,20
1,80
2,30
0,00
%
0,70
0,40
0,00
0,00
0,00
4,30
0,00
0,00
0,00
0,00
%
10,70
0,00
0,00
0,00
1,20
0,00
4,80

PETROGRAPHIC DATA SHEET

SAMPLE IDENTITY
Company
EMP
Well
A
Sample type
Core
Depth (ft)
5342,20
Formation
Lower Sihapas

GENERAL COMPOSITION
Particles
50,10
Other
0,00
Detrital Matrix
3,70
Replacement
12,20
Cements
25,20
Visibles pores
8,80
Total (%)
100,00

Rock Name

Sandstone

Classification

Sublitharenite (Pettijohn, 1975)

GRAIN COMPOSITION

%

Monocryst. Quartz
Straight extinction
Undolose extiction
Reworked

6,10
36,20
0,30

Feldspars
Potash Feldspars
Plagioclase
Rock Fragments
Igneous
(acid)
(basic)
Metamorphic
Polycrystalin qz
Low grade
Med grade
High grade
Sed. Rock fragments
Claystone
siltstone
Pyroclastic
Chert
Silisified grain
Accessory minerals
Glauconite
Carbonaceous mat.
Micas
Heavy minerals
Opaque minerals
Altered grain

1,20
1,10

0,90
1,70
0,70
0,20
0,00
0,00
0,00
0,00
0,00
0,00
0,00
1,70
0,00
0,00
0,00
0,00
0,00

GRAIN COMPOSITION
(Continued)
Carbonate grains
Clastic Lime, Bio, Physico Ch.
Intraclasts
Algal Stromatolites
Pellets
Oolites
Pisolites
Ooids

Skeletal grains
Red algae
Green algae
Blue green algae
Arenaceous forams
Planktonic forams
Small bent. Forams
Large Forams
Milliolids
Oncolites
Phylloid alga
Grapitolites
Corals
Bryozoan
Echinoderms
Brachiopods
Molluscs
Gastropods
Sponge
Indeterminate bioclasts
OTHERS
Pseudomatrix
Car. Sideritic lam. Clays
Carbon streak

// nikol

Grain size means
Grain size range
Sorting
Roundness
Grain contacts
Structure

%
0,00
0,00
0,00
0,00
0,00
0,00
0,00

0,00
0,00
0,00
0,00
0,00
0,00
0,00
0,00
0,00
0,00
0,00
0,00
0,00
0,00
0,00
0,00
0,00
0,00
0,00
0,00
%
0,00
0,00

x nikol

TEXTURES
0,475 mm
0,435 – 1,02 mm
Well – moderately
Angular – subrounded
Suture – concav convex
-

MATRIX
Detrital clays
Carbonate mud
Volcanic glass
CEMENTS
Indeterminate clays
Dolomite
Calcite
Micrite
Siderite
Pyrite
Kaolinite
Illite
Quartz overgrowth
Ferroan oxide
REPLACEMENT
Calcite
Micrite
siderite
Dolomite
Pyrite
Kaolinite
Zeolite
Indeterminate clays
Chlorite
Silica
POROSITY
Intergranular
Intragranular
Fracture
Micropore
Mouldic
Micro intercrystalin
Dissolution

%
1,20
1,10
1,40
%
2,50
0,00
1,30
2,70
0,00
0,90
4,60
7,30
5,90
0,00
%
1,30
3,70
0,00
0,00
2,60
4,60
0,00
0,00
0,00
0,00
%
1,30
0,00
0,80
0,00
0,00
0,00
6,70

PETROGRAPHIC DATA SHEET

SAMPLE IDENTITY
Company
EMP
Well
A
Sample type
Core
Depth (ft)
5349,90
Formation
Lower Sihapas

GENERAL COMPOSITION
Particles
61,90
Other
0,00
Detrital Matrix
5,70
Replacement
9,00
Cements
13,80
Visibles pores
9,60
Total (%)
100,00

Rock Name

Sandstone

Classification

Sublitharenite (Pettijohn, 1975)

GRAIN COMPOSITION

%

Monocryst. Quartz
Straight extinction
Undolose extiction
Reworked

3,80
39,20
2,10

Feldspars
Potash Feldspars
Plagioclase
Rock Fragments
Igneous
(acid)
(basic)
Metamorphic
Polycrystalin qz
Low grade
Med grade
High grade
Sed. Rock fragments
Claystone
siltstone
Pyroclastic
Chert
Silisified grain
Accessory minerals
Glauconite
Carbonaceous mat.
Micas
Heavy minerals
Opaque minerals
Altered grain

2,30
1,10

1,30
1,10
2,10
0,30
0,00
0,00
0,00
0,00
0,00
0,00
0,00
6,20
0,00
2,70
0,00
0,00
0,00

GRAIN COMPOSITION
(Continued)
Carbonate grains
Clastic Lime, Bio, Physico Ch.
Intraclasts
Algal Stromatolites
Pellets
Oolites
Pisolites
Ooids

Skeletal grains
Red algae
Green algae
Blue green algae
Arenaceous forams
Planktonic forams
Small bent. Forams
Large Forams
Milliolids
Oncolites
Phylloid alga
Grapitolites
Corals
Bryozoan
Echinoderms
Brachiopods
Molluscs
Gastropods
Sponge
Indeterminate bioclasts
OTHERS
Pseudomatrix
Car. Sideritic lam. Clays
Carbon streak

// nikol

Grain size means
Grain size range
Sorting
Roundness
Grain contacts
Structure

%
0,00
0,00
0,00
0,00
0,00
0,00
0,00

0,00
0,00
0,00
0,00
0,00
0,00
0,00
0,00
0,00
0,00
0,00
0,00
0,00
0,00
0,00
0,00
0,00
0,00
0,00
0,00
%
0,00
0,00

x nikol

TEXTURES
0,357 mm
0,274 – 0,623 mm
Well sorted
Angular – subrounded
Suture – concav convex
-

MATRIX
Detrital clays
Carbonate mud
Volcanic glass
CEMENTS
Indeterminate clays
Dolomite
Calcite
Micrite
Siderite
Pyrite
Kaolinite
Illite
Quartz overgrowth
Ferroan oxide
REPLACEMENT
Calcite
Micrite
siderite
Dolomite
Pyrite
Kaolinite
Zeolite
Indeterminate clays
Chlorite
Silica
POROSITY
Intergranular
Intragranular
Fracture
Micropore
Mouldic
Micro intercrystalin
Dissolution

%
1,50
1,70
2,50
%
0,00
0,00
1,80
1,60
0,00
0,70
1,80
3,20
4,70
0,00
%
1,40
1,20
0,00
0,00
1,80
4,60
0,00
0,00
0,00
0,00
%
3,50
0,50
0,00
0,00
1,70
0,00
3,90

PETROGRAPHIC DATA SHEET

SAMPLE IDENTITY
Company
EMP
Well
A
Sample type
Core
Depth (ft)
5350,45
Formation
Lower Sihapas

GENERAL COMPOSITION
Particles
67,80
Other
0,00
Detrital Matrix
2,80
Replacement
9,10
Cements
6,40
Visibles pores
13,90
Total (%)
100,00

Rock Name

Sandstone

Classification

Sublitharenite (Pettijohn, 1975)

GRAIN COMPOSITION

%

Monocryst. Quartz
Straight extinction
Undolose extiction
Reworked

1,20
48,60
1,30

Feldspars
Potash Feldspars
Plagioclase
Rock Fragments
Igneous
(acid)
(basic)
Metamorphic
Polycrystalin qz
Low grade
Med grade
High grade
Sed. Rock fragments
Claystone
siltstone
Pyroclastic
Chert
Silisified grain
Accessory minerals
Glauconite
Carbonaceous mat.
Micas
Heavy minerals
Opaque minerals
Altered grain

3,10
1,10

1,90
1,80
1,70
0,00
0,00
0,00
0,00
0,00
0,00
0,00
0,00
4,80
0,00
2,30
0,00
0,00
0,00

GRAIN COMPOSITION
(Continued)
Carbonate grains
Clastic Lime, Bio, Physico Ch.
Intraclasts
Algal Stromatolites
Pellets
Oolites
Pisolites
Ooids

Skeletal grains
Red algae
Green algae
Blue green algae
Arenaceous forams
Planktonic forams
Small bent. Forams
Large Forams
Milliolids
Oncolites
Phylloid alga
Grapitolites
Corals
Bryozoan
Echinoderms
Brachiopods
Molluscs
Gastropods
Sponge
Indeterminate bioclasts
OTHERS
Pseudomatrix
Car. Sideritic lam. Clays
Carbon streak

// nikol

Grain size means
Grain size range
Sorting
Roundness
Grain contacts
Structure

%

TEXTURES
0,183 mm
0,093 – 0,412 mm
Well sorted
Subangular – subrounded
Suture – long
-

MATRIX

0,00
0,00
0,00
0,00
0,00
0,00
0,00

0,00
0,00
0,00
0,00
0,00
0,00
0,00
0,00
0,00
0,00
0,00
0,00
0,00
0,00
0,00
0,00
0,00
0,00
0,00
0,00
%
0,00
0,00

x nikol

Detrital clays
Carbonate mud
Volcanic glass
CEMENTS
Indeterminate clays
Dolomite
Calcite
Micrite
Siderite
Pyrite
Kaolinite
Illite
Quartz overgrowth
Ferroan oxide
REPLACEMENT
Calcite
Micrite
siderite
Dolomite
Pyrite
Kaolinite
Zeolite
Indeterminate clays
Chlorite
Silica
POROSITY
Intergranular
Intragranular
Fracture
Micropore
Mouldic
Micro intercrystalin
Dissolution

%
1,20
1,60
0,00
%
0,00
0,00
2,10
1,90
0,00
1,20
0,00
0,00
1,20
0,00
%
1,20
1,10
0,00
0,00
2,20
4,60
0,00
0,00
0,00
0,00
%
8,30
0,00
0,00
0,00
1,70
0,00
3,90

PETROGRAPHIC DATA SHEET

SAMPLE IDENTITY
Company
EMP
Well
A
Sample type
Core
Depth (ft)
5367,00
Formation
Lower Sihapas

GENERAL COMPOSITION
Particles
52,70
Other
0,00
Detrital Matrix
5,80
Replacement
25,10
Cements
10,10
Visibles pores
6,30
Total (%)
100,00

Rock Name

Sandstone

Classification

Sublitharenite (Pettijohn, 1975)

GRAIN COMPOSITION

%

Monocryst. Quartz
Straight extinction
Undolose extiction
Reworked

1,30
38,90
0,00

Feldspars
Potash Feldspars
Plagioclase
Rock Fragments
Igneous
(acid)
(basic)
Metamorphic
Polycrystalin qz
Low grade
Med grade
High grade
Sed. Rock fragments
Claystone
siltstone
Pyroclastic
Chert
Silisified grain
Accessory minerals
Glauconite
Carbonaceous mat.
Micas
Heavy minerals
Opaque minerals
Altered grain

3,20
1,10

0,00
0,90
1,80
0,00
0,00
0,00
0,00
0,00
0,00
0,00
0,00
3,40
0,00
2,10
0,00
0,00
0,00

GRAIN COMPOSITION
(Continued)
Carbonate grains
Clastic Lime, Bio, Physico Ch.
Intraclasts
Algal Stromatolites
Pellets
Oolites
Pisolites
Ooids

Skeletal grains
Red algae
Green algae
Blue green algae
Arenaceous forams
Planktonic forams
Small bent. Forams
Large Forams
Milliolids
Oncolites
Phylloid alga
Grapitolites
Corals
Bryozoan
Echinoderms
Brachiopods
Molluscs
Gastropods
Sponge
Indeterminate bioclasts
OTHERS
Pseudomatrix
Car. Sideritic lam. Clays
Carbon streak

// nikol

Grain size means
Grain size range
Sorting
Roundness
Grain contacts
Structure

%

TEXTURES
0,206 mm
0,103 – 0,427 mm
Poorly – moderately
Angular – subrounded
Point – suture, point >>
-

MATRIX

0,00
0,00
0,00
0,00
0,00
0,00
0,00

0,00
0,00
0,00
0,00
0,00
0,00
0,00
0,00
0,00
0,00
0,00
0,00
0,00
0,00
0,00
0,00
0,00
0,00
0,00
0,00
%
0,00
0,00

x nikol

Detrital clays
Carbonate mud
Volcanic glass
CEMENTS
Indeterminate clays
Dolomite
Calcite
Micrite
Siderite
Pyrite
Kaolinite
Illite
Quartz overgrowth
Ferroan oxide
REPLACEMENT
Calcite
Micrite
siderite
Dolomite
Pyrite
Kaolinite
Zeolite
Indeterminate clays
Chlorite
Silica
POROSITY
Intergranular
Intragranular
Fracture
Micropore
Mouldic
Micro intercrystalin
Dissolution

%
2,00
1,70
2,10
%
3,20
0,00
1,10
1,80
0,00
0,40
2,20
0,80
0,60
0,00
%
0,90
1,20
0,00
0,00
0,70
22,30
0,00
0,00
0,00
0,00
%
3,40
0,00
0,00
0,00
0,00
0,00
2,90

PETROGRAPHIC DATA SHEET

SAMPLE IDENTITY
Company
EMP
Well
A
Sample type
Core
Depth (ft)
5370,25
Formation
Lower Sihapas

GENERAL COMPOSITION
Particles
66,80
Other
0,00
Detrital Matrix
2,70
Replacement
8,80
Cements
13,60
Visibles pores
8,10
Total (%)
100,00

Rock Name

Sandstone

Classification

Sublitharenite (Pettijohn, 1975)

GRAIN COMPOSITION

%

Monocryst. Quartz
Straight extinction
Undolose extiction
Reworked

2,40
51,10
1,50

Feldspars
Potash Feldspars
Plagioclase
Rock Fragments
Igneous
(acid)
(basic)
Metamorphic
Polycrystalin qz
Low grade
Med grade
High grade
Sed. Rock fragments
Claystone
siltstone
Pyroclastic
Chert
Silisified grain
Accessory minerals
Glauconite
Carbonaceous mat.
Micas
Heavy minerals
Opaque minerals
Altered grain

1,70
1,60

0,90
0,50
1,30
0,70
0,00
0,00
0,00
0,00
0,00
0,00
0,00
2,20
0,00
2,90
0,00
0,00
0,00

GRAIN COMPOSITION
(Continued)
Carbonate grains
Clastic Lime, Bio, Physico Ch.
Intraclasts
Algal Stromatolites
Pellets
Oolites
Pisolites
Ooids

Skeletal grains
Red algae
Green algae
Blue green algae
Arenaceous forams
Planktonic forams
Small bent. Forams
Large Forams
Milliolids
Oncolites
Phylloid alga
Grapitolites
Corals
Bryozoan
Echinoderms
Brachiopods
Molluscs
Gastropods
Sponge
Indeterminate bioclasts
OTHERS
Pseudomatrix
Car. Sideritic lam. Clays
Carbon streak

// nikol

Grain size means
Grain size range
Sorting
Roundness
Grain contacts
Structure

%
0,00
0,00
0,00
0,00
0,00
0,00
0,00

0,00
0,00
0,00
0,00
0,00
0,00
0,00
0,00
0,00
0,00
0,00
0,00
0,00
0,00
0,00
0,00
0,00
0,00
0,00
0,00
%
0,00
0,00

x nikol

TEXTURES
0,205 mm
0,178 – 0,653 mm
Moderately – well sorted
Subangular – subrounded
Long – suture
-

MATRIX
Detrital clays
Carbonate mud
Volcanic glass
CEMENTS
Indeterminate clays
Dolomite
Calcite
Micrite
Siderite
Pyrite
Kaolinite
Illite
Quartz overgrowth
Ferroan oxide
REPLACEMENT
Calcite
Micrite
siderite
Dolomite
Pyrite
Kaolinite
Zeolite
Indeterminate clays
Chlorite
Silica
POROSITY
Intergranular
Intragranular
Fracture
Micropore
Mouldic
Micro intercrystalin
Dissolution

%
1,40
1,30
0,00
%
2,40
0,00
1,10
1,30
0,00
0,70
4,30
1,70
2,10
0,00
%
1,30
4,10
0,00
0,00
1,10
2,30
0,00
0,00
0,00
0,00
%
3,30
0,00
0,00
0,00
1,50
0,00
3,30

PETROGRAPHIC DATA SHEET

SAMPLE IDENTITY
Company
EMP
Well
A
Sample type
Core
Depth (ft)
5372,10
Formation
Lower Sihapas

GENERAL COMPOSITION
Particles
62,40
Other
0,00
Detrital Matrix
2,60
Replacement
12,00
Cements
13,00
Visibles pores
10,00
Total (%)
100,00

Rock Name

Sandstone

Classification

Sublitharenite (Pettijohn, 1975)

GRAIN COMPOSITION

%

Monocryst. Quartz
Straight extinction
Undolose extiction
Reworked

3,30
44,50
0,30

Feldspars
Potash Feldspars
Plagioclase
Rock Fragments
Igneous
(acid)
(basic)
Metamorphic
Polycrystalin qz
Low grade
Med grade
High grade
Sed. Rock fragments
Claystone
siltstone
Pyroclastic
Chert
Silisified grain
Accessory minerals
Glauconite
Carbonaceous mat.
Micas
Heavy minerals
Opaque minerals
Altered grain

1,90
2,30

1,30
1,60
1,40
0,00
0,00
0,00
0,00
0,00
0,00
0,00
0,00
4,30
0,00
1,50
0,00
0,00
0,00

GRAIN COMPOSITION
(Continued)
Carbonate grains
Clastic Lime, Bio, Physico Ch.
Intraclasts
Algal Stromatolites
Pellets
Oolites
Pisolites
Ooids

Skeletal grains
Red algae
Green algae
Blue green algae
Arenaceous forams
Planktonic forams
Small bent. Forams
Large Forams
Milliolids
Oncolites
Phylloid alga
Grapitolites
Corals
Bryozoan
Echinoderms
Brachiopods
Molluscs
Gastropods
Sponge
Indeterminate bioclasts
OTHERS
Pseudomatrix
Car. Sideritic lam. Clays
Carbon streak

// nikol

Grain size means
Grain size range
Sorting
Roundness
Grain contacts
Structure

%
0,00
0,00
0,00
0,00
0,00
0,00
0,00

0,00
0,00
0,00
0,00
0,00
0,00
0,00
0,00
0,00
0,00
0,00
0,00
0,00
0,00
0,00
0,00
0,00
0,00
0,00
0,00
%
0,00
0,00

x nikol

TEXTURES
0,237 mm
0,193 – 0,497 mm
Moderately – poorly sorted
Angular – subrounded
Suture – long
-

MATRIX
Detrital clays
Carbonate mud
Volcanic glass
CEMENTS
Indeterminate clays
Dolomite
Calcite
Micrite
Siderite
Pyrite
Kaolinite
Illite
Quartz overgrowth
Ferroan oxide
REPLACEMENT
Calcite
Micrite
siderite
Dolomite
Pyrite
Kaolinite
Zeolite
Indeterminate clays
Chlorite
Silica
POROSITY
Intergranular
Intragranular
Fracture
Micropore
Mouldic
Micro intercrystalin
Dissolution

%
1,40
1,20
0,00
%
1,90
0,00
1,40
1,20
0,00
0,40
3,10
2,90
2,10
0,00
%
1,20
1,40
0,00
0,00
1,10
8,30
0,00
0,00
0,00
0,00
%
2,40
1,10
0,00
0,00
1,10
0,00
5,40

PETROGRAPHIC DATA SHEET

SAMPLE IDENTITY
Company
EMP
Well
A
Sample type
Core
Depth (ft)
5375,30
Formation
Lower Sihapas

GENERAL COMPOSITION
Particles
71,10
Other
0,00
Detrital Matrix
4,40
Replacement
2,90
Cements
4,50
Visibles pores
17,10
Total (%)
100,00

Rock Name

Sandstone

Classification

Sublitharenite (Pettijohn, 1975)

GRAIN COMPOSITION

%

Monocryst. Quartz
Straight extinction
Undolose extiction
Reworked

1,30
55,10
2,10

Feldspars
Potash Feldspars
Plagioclase
Rock Fragments
Igneous
(acid)
(basic)
Metamorphic
Polycrystalin qz
Low grade
Med grade
High grade
Sed. Rock fragments
Claystone
siltstone
Pyroclastic
Chert
Silisified grain
Accessory minerals
Glauconite
Carbonaceous mat.
Micas
Heavy minerals
Opaque minerals
Altered grain

1,80
1,50

1,70
0,00
2,30
0,00
0,00
0,00
0,00
0,00
0,00
0,00
0,00
3,40
0,00
1,90
0,00
0,00
0,00

GRAIN COMPOSITION
(Continued)
Carbonate grains
Clastic Lime, Bio, Physico Ch.
Intraclasts
Algal Stromatolites
Pellets
Oolites
Pisolites
Ooids

Skeletal grains
Red algae
Green algae
Blue green algae
Arenaceous forams
Planktonic forams
Small bent. Forams
Large Forams
Milliolids
Oncolites
Phylloid alga
Grapitolites
Corals
Bryozoan
Echinoderms
Brachiopods
Molluscs
Gastropods
Sponge
Indeterminate bioclasts
OTHERS
Pseudomatrix
Car. Sideritic lam. Clays
Carbon streak

// nikol

Grain size means
Grain size range
Sorting
Roundness
Grain contacts
Structure

%
0,00
0,00
0,00
0,00
0,00
0,00
0,00

0,00
0,00
0,00
0,00
0,00
0,00
0,00
0,00
0,00
0,00
0,00
0,00
0,00
0,00
0,00
0,00
0,00
0,00
0,00
0,00
%
0,00
0,00

x nikol

TEXTURES
0,267 mm
0,095 – 1,253 mm
Well sorted
Subangular – rounded
Long > suture
-

MATRIX
Detrital clays
Carbonate mud
Volcanic glass
CEMENTS
Indeterminate clays
Dolomite
Calcite
Micrite
Siderite
Pyrite
Kaolinite
Illite
Quartz overgrowth
Ferroan oxide
REPLACEMENT
Calcite
Micrite
siderite
Dolomite
Pyrite
Kaolinite
Zeolite
Indeterminate clays
Chlorite
Silica
POROSITY
Intergranular
Intragranular
Fracture
Micropore
Mouldic
Micro intercrystalin
Dissolution

%
1,60
1,40
1,40
%
0,00
0,00
1,10
1,20
0,00
0,00
0,00
0,00
1,30
0,00
%
0,90
1,10
0,00
0,00
0,90
0,00
0,00
0,00
0,00
0,00
%
9,70
0,60
0,00
0,00
2,50
0,00
4,30

PETROGRAPHIC DATA SHEET

SAMPLE IDENTITY
Company
EMP
Well
A
Sample type
Core
Depth (ft)
5381,00
Formation
Lower Sihapas

GENERAL COMPOSITION
Particles
68,60
Other
0,00
Detrital Matrix
3,90
Replacement
4,00
Cements
4,50
Visibles pores
19,00
Total (%)
100,00

Rock Name

Sandstone

Classification

Sublitharenite (Pettijohn, 1975)

GRAIN COMPOSITION

%

Monocryst. Quartz
Straight extinction
Undolose extiction
Reworked

2,30
53,20
0,90

Feldspars
Potash Feldspars
Plagioclase
Rock Fragments
Igneous
(acid)
(basic)
Metamorphic
Polycrystalin qz
Low grade
Med grade
High grade
Sed. Rock fragments
Claystone
siltstone
Pyroclastic
Chert
Silisified grain
Accessory minerals
Glauconite
Carbonaceous mat.
Micas
Heavy minerals
Opaque minerals
Altered grain

1,50
1,70

0,50
0,70
1,20
0,00
0,00
0,00
0,00
0,00
0,00
0,00
2,70
2,20
0,00
1,70
0,00
0,00
0,00

GRAIN COMPOSITION
(Continued)
Carbonate grains
Clastic Lime, Bio, Physico Ch.
Intraclasts
Algal Stromatolites
Pellets
Oolites
Pisolites
Ooids

Skeletal grains
Red algae
Green algae
Blue green algae
Arenaceous forams
Planktonic forams
Small bent. Forams
Large Forams
Milliolids
Oncolites
Phylloid alga
Grapitolites
Corals
Bryozoan
Echinoderms
Brachiopods
Molluscs
Gastropods
Sponge
Indeterminate bioclasts
OTHERS
Pseudomatrix
Car. Sideritic lam. Clays
Carbon streak

// nikol

Grain size means
Grain size range
Sorting
Roundness
Grain contacts
Structure

%
0,00
0,00
0,00
0,00
0,00
0,00
0,00

0,00
0,00
0,00
0,00
0,00
0,00
0,00
0,00
0,00
0,00
0,00
0,00
0,00
0,00
0,00
0,00
0,00
0,00
0,00
0,00
%
0,00
0,00

x nikol

TEXTURES
0,269 mm
0,110 – 0,762 mm
Poorly – moderately sorted
Subangular – subrounded
Suture – concav convex
-

MATRIX
Detrital clays
Carbonate mud
Volcanic glass
CEMENTS
Indeterminate clays
Dolomite
Calcite
Micrite
Siderite
Pyrite
Kaolinite
Illite
Quartz overgrowth
Ferroan oxide
REPLACEMENT
Calcite
Micrite
siderite
Dolomite
Pyrite
Kaolinite
Zeolite
Indeterminate clays
Chlorite
Silica
POROSITY
Intergranular
Intragranular
Fracture
Micropore
Mouldic
Micro intercrystalin
Dissolution

%
1,50
1,10
1,30
%
0,00
0,00
1,30
1,10
0,00
0,50
0,00
0,00
1,10
0,50
%
1,20
1,50
0,00
0,00
0,00
1,30
0,00
0,00
0,00
0,00
%
12,80
2,20
0,00
0,00
1,30
0,00
2,70

PETROGRAPHIC DATA SHEET

SAMPLE IDENTITY
Company
EMP
Well
A
Sample type
Core
Depth (ft)
5387,20
Formation
Lower Sihapas

GENERAL COMPOSITION
Particles
62,40
Other
0,00
Detrital Matrix
6,50
Replacement
4,30
Cements
7,00
Visibles pores
19,80
Total (%)
100,00

Rock Name

Sandstone

Classification

Sublitharenite (Pettijohn, 1975)

GRAIN COMPOSITION

%

Monocryst. Quartz
Straight extinction
Undolose extiction
Reworked

1,70
46,30
0,90

Feldspars
Potash Feldspars
Plagioclase
Rock Fragments
Igneous
(acid)
(basic)
Metamorphic
Polycrystalin qz
Low grade
Med grade
High grade
Sed. Rock fragments
Claystone
siltstone
Pyroclastic
Chert
Silisified grain
Accessory minerals
Glauconite
Carbonaceous mat.
Micas
Heavy minerals
Opaque minerals
Altered grain

1,10
1,30

0,00
2,40
2,10
1,30
0,00
0,00
0,00
0,00
0,00
0,00
1,70
2,70,00
0,90
0,00
0,00
0,00

GRAIN COMPOSITION
(Continued)
Carbonate grains
Clastic Lime, Bio, Physico Ch.
Intraclasts
Algal Stromatolites
Pellets
Oolites
Pisolites
Ooids

Skeletal grains
Red algae
Green algae
Blue green algae
Arenaceous forams
Planktonic forams
Small bent. Forams
Large Forams
Milliolids
Oncolites
Phylloid alga
Grapitolites
Corals
Bryozoan
Echinoderms
Brachiopods
Molluscs
Gastropods
Sponge
Indeterminate bioclasts
OTHERS
Pseudomatrix
Car. Sideritic lam. Clays
Carbon streak

// nikol

Grain size means
Grain size range
Sorting
Roundness
Grain contacts
Structure

%
0,00
0,00
0,00
0,00
0,00
0,00
0,00

0,00
0,00
0,00
0,00
0,00
0,00
0,00
0,00
0,00
0,00
0,00
0,00
0,00
0,00
0,00
0,00
0,00
0,00
0,00
0,00
%
0,00
0,00

x nikol

TEXTURES
0,307 mm
0,125 – 0,823 mm
Moderately
Subangular – rounded
Long > concav convex
-

MATRIX
Detrital clays
Carbonate mud
Volcanic glass
CEMENTS
Indeterminate clays
Dolomite
Calcite
Micrite
Siderite
Pyrite
Kaolinite
Illite
Quartz overgrowth
Ferroan oxide
REPLACEMENT
Calcite
Micrite
siderite
Dolomite
Pyrite
Kaolinite
Zeolite
Indeterminate clays
Chlorite
Silica
POROSITY
Intergranular
Intragranular
Fracture
Micropore
Mouldic
Micro intercrystalin
Dissolution

%
1,50
1,20
3,80
%
0,00
0,00
1,20
1,10
0,00
2,10
0,00
0,00
1,50
1,10
%
1,30
1,50
0,00
0,00
1,50
0,00
0,00
0,00
0,00
0,00
%
9,20
0,00
0,00
0,00
3,30
0,00
7,30

PETROGRAPHIC DATA SHEET

SAMPLE IDENTITY
Company
EMP
Well
A
Sample type
Core
Depth (ft)
5391,10
Formation
Lower Sihapas

GENERAL COMPOSITION
Particles
62,80
Other
0,00
Detrital Matrix
5,40
Replacement
7,80
Cements
4,40
Visibles pores
19,60
Total (%)
100,00

Rock Name

Sandstone

Classification

Sublitharenite (Pettijohn, 1975)

GRAIN COMPOSITION

%

Monocryst. Quartz
Straight extinction
Undolose extiction
Reworked

2,40
48,30
0,90

Feldspars
Potash Feldspars
Plagioclase
Rock Fragments
Igneous
(acid)
(basic)
Metamorphic
Polycrystalin qz
Low grade
Med grade
High grade
Sed. Rock fragments
Claystone
siltstone
Pyroclastic
Chert
Silisified grain
Accessory minerals
Glauconite
Carbonaceous mat.
Micas
Heavy minerals
Opaque minerals
Altered grain

1,30
1,50

0,00
0,90
2,20
0,50
0,00
0,00
0,00
0,00
0,00
0,00
0,00
3,40
0,00
1,40
0,00
0,00
0,00

GRAIN COMPOSITION
(Continued)
Carbonate grains
Clastic Lime, Bio, Physico Ch.
Intraclasts
Algal Stromatolites
Pellets
Oolites
Pisolites
Ooids

Skeletal grains
Red algae
Green algae
Blue green algae
Arenaceous forams
Planktonic forams
Small bent. Forams
Large Forams
Milliolids
Oncolites
Phylloid alga
Grapitolites
Corals
Bryozoan
Echinoderms
Brachiopods
Molluscs
Gastropods
Sponge
Indeterminate bioclasts
OTHERS
Pseudomatrix
Car. Sideritic lam. Clays
Carbon streak

// nikol

Grain size means
Grain size range
Sorting
Roundness
Grain contacts
Structure

%
0,00
0,00
0,00
0,00
0,00
0,00
0,00

0,00
0,00
0,00
0,00
0,00
0,00
0,00
0,00
0,00
0,00
0,00
0,00
0,00
0,00
0,00
0,00
0,00
0,00
0,00
0,00
%
0,00
0,00

x nikol

TEXTURES
0,297 mm
0,132 – 0,759 mm
Moderately – well sorted
Subangular – rounded
Long > concav convex
-

MATRIX
Detrital clays
Carbonate mud
Volcanic glass
CEMENTS
Indeterminate clays
Dolomite
Calcite
Micrite
Siderite
Pyrite
Kaolinite
Illite
Quartz overgrowth
Ferroan oxide
REPLACEMENT
Calcite
Micrite
siderite
Dolomite
Pyrite
Kaolinite
Zeolite
Indeterminate clays
Chlorite
Silica
POROSITY
Intergranular
Intragranular
Fracture
Micropore
Mouldic
Micro intercrystalin
Dissolution

%
1,70
1,20
2,50
%
0,00
0,00
1,60
1,90
0,00
0,00
0,00
0,00
0,90
0,00
%
1,40
2,20
0,00
0,00
2,10
2,10
0,00
0,00
0,00
0,00
%
8,70
0,00
0,00
0,00
4,20
0,00
6,70

PETROGRAPHIC DATA SHEET

SAMPLE IDENTITY
Company
EMP
Well
A
Sample type
Core
Depth (ft)
5395,15
Formation
Lower Sihapas

GENERAL COMPOSITION
Particles
55,30
Other
0,00
Detrital Matrix
5,60
Replacement
14,60
Cements
6,90
Visibles pores
17,60
Total (%)
100,00

Rock Name

Sandstone

Classification

Sublitharenite (Pettijohn, 1975)

GRAIN COMPOSITION

%

Monocryst. Quartz
Straight extinction
Undolose extiction
Reworked

1,10
38,20
1,10

Feldspars
Potash Feldspars
Plagioclase
Rock Fragments
Igneous
(acid)
(basic)
Metamorphic
Polycrystalin qz
Low grade
Med grade
High grade
Sed. Rock fragments
Claystone
siltstone
Pyroclastic
Chert
Silisified grain
Accessory minerals
Glauconite
Carbonaceous mat.
Micas
Heavy minerals
Opaque minerals
Altered grain

0,60
1,10

2,10
0,90
1,20
0,90
0,00
0,00
2,10
0,00
0,00
0,00
1,70
2,90
0,00
1,40
0,00
0,00
0,00

GRAIN COMPOSITION
(Continued)
Carbonate grains
Clastic Lime, Bio, Physico Ch.
Intraclasts
Algal Stromatolites
Pellets
Oolites
Pisolites
Ooids

Skeletal grains
Red algae
Green algae
Blue green algae
Arenaceous forams
Planktonic forams
Small bent. Forams
Large Forams
Milliolids
Oncolites
Phylloid alga
Grapitolites
Corals
Bryozoan
Echinoderms
Brachiopods
Molluscs
Gastropods
Sponge
Indeterminate bioclasts
OTHERS
Pseudomatrix
Car. Sideritic lam. Clays
Carbon streak

// nikol

Grain size means
Grain size range
Sorting
Roundness
Grain contacts
Structure

%
0,00
0,00
0,00
0,00
0,00
0,00
0,00

0,00
0,00
0,00
0,00
0,00
0,00
0,00
0,00
0,00
0,00
0,00
0,00
0,00
0,00
0,00
0,00
0,00
0,00
0,00
0,00
%
0,00
0,00

x nikol

TEXTURES
0,259 mm
0,011 – 0, 905 mm
Poorly – moderately sorted
Anular – rounded
Concav convex - floating
-

MATRIX
Detrital clays
Carbonate mud
Volcanic glass
CEMENTS
Indeterminate clays
Dolomite
Calcite
Micrite
Siderite
Pyrite
Kaolinite
Illite
Quartz overgrowth
Ferroan oxide
REPLACEMENT
Calcite
Micrite
siderite
Dolomite
Pyrite
Kaolinite
Zeolite
Indeterminate clays
Chlorite
Silica
POROSITY
Intergranular
Intragranular
Fracture
Micropore
Mouldic
Micro intercrystalin
Dissolution

%
2,10
1,30
2,20
%
0,00
0,00
1,10
2,30
0,00
0,70
0,60
0,00
1,50
1,30
%
0,70
2,30
0,00
0,00
1,90
9,70
0,00
0,00
0,00
0,00
%
5,70
2,90
0,00
0,00
5,20
0,00
3,80

PETROGRAPHIC DATA SHEET

SAMPLE IDENTITY
Company
EMP
Well
A
Sample type
Core
Depth (ft)
5398,20
Formation
Lower Sihapas

GENERAL COMPOSITION
Particles
58,90
Other
0,00
Detrital Matrix
5,80
Replacement
10,00
Cements
6,00
Visibles pores
19,30
Total (%)
100,00

Rock Name

Sandstone

Classification

Sublitharenite (Pettijohn, 1975)

GRAIN COMPOSITION

%

Monocryst. Quartz
Straight extinction
Undolose extiction
Reworked

1,70
43,70
0,70

Feldspars
Potash Feldspars
Plagioclase
Rock Fragments
Igneous
(acid)
(basic)
Metamorphic
Polycrystalin qz
Low grade
Med grade
High grade
Sed. Rock fragments
Claystone
siltstone
Pyroclastic
Chert
Silisified grain
Accessory minerals
Glauconite
Carbonaceous mat.
Micas
Heavy minerals
Opaque minerals
Altered grain

0,90
1,70

1,20
0,00
1,90
2,40
0,00
0,00
0,00
0,00
0,00
0,00
0,00
2,30
0,00
2,40
0,00
0,00
0,00

GRAIN COMPOSITION
(Continued)
Carbonate grains
Clastic Lime, Bio, Physico Ch.
Intraclasts
Algal Stromatolites
Pellets
Oolites
Pisolites
Ooids

Skeletal grains
Red algae
Green algae
Blue green algae
Arenaceous forams
Planktonic forams
Small bent. Forams
Large Forams
Milliolids
Oncolites
Phylloid alga
Grapitolites
Corals
Bryozoan
Echinoderms
Brachiopods
Molluscs
Gastropods
Sponge
Indeterminate bioclasts
OTHERS
Pseudomatrix
Car. Sideritic lam. Clays
Carbon streak

// nikol

Grain size means
Grain size range
Sorting
Roundness
Grain contacts
Structure

%
0,00
0,00
0,00
0,00
0,00
0,00
0,00

0,00
0,00
0,00
0,00
0,00
0,00
0,00
0,00
0,00
0,00
0,00
0,00
0,00
0,00
0,00
0,00
0,00
0,00
0,00
0,00
%
0,00
0,00

x nikol

TEXTURES
0,230 mm
0,017 – 0,430 mm
Poorly – moderately sorted
Subangular – rounded
Concav convex > floating
-

MATRIX
Detrital clays
Carbonate mud
Volcanic glass
CEMENTS
Indeterminate clays
Dolomite
Calcite
Micrite
Siderite
Pyrite
Kaolinite
Illite
Quartz overgrowth
Ferroan oxide
REPLACEMENT
Calcite
Micrite
siderite
Dolomite
Pyrite
Kaolinite
Zeolite
Indeterminate clays
Chlorite
Silica
POROSITY
Intergranular
Intragranular
Fracture
Micropore
Mouldic
Micro intercrystalin
Dissolution

%
3,00
1,10
1,70
%
1,90
0,00
1,10
1,40
0,00
0,50
0,00
0,00
0,60
0,50
%
0,50
1,30
0,00
0,00
1,70
6,50
0,00
0,00
0,00
0,00
%
4,20
4,50
0,00
0,00
3,70
0,00
6,90

PETROGRAPHIC DATA SHEET

SAMPLE IDENTITY
Company
EMP
Well
A
Sample type
Core
Depth (ft)
5401,00
Formation
Lower Sihapas

GENERAL COMPOSITION
Particles
53,50
Other
0,00
Detrital Matrix
5,80
Replacement
8,50
Cements
5,90
Visibles pores
16,30
Total (%)
100,00

Rock Name

Sandstone

Classification

Sublitharenite (Pettijohn, 1975)

GRAIN COMPOSITION

%

Monocryst. Quartz
Straight extinction
Undolose extiction
Reworked

1,40
45,10
1,10

Feldspars
Potash Feldspars
Plagioclase
Rock Fragments
Igneous
(acid)
(basic)
Metamorphic
Polycrystalin qz
Low grade
Med grade
High grade
Sed. Rock fragments
Claystone
siltstone
Pyroclastic
Chert
Silisified grain
Accessory minerals
Glauconite
Carbonaceous mat.
Micas
Heavy minerals
Opaque minerals
Altered grain

1,60
1,20

0,90
1,20
2,40
1,30
0,00
0,00
0,70
0,00
0,00
0,00
0,00
5,20
0,00
1,40
0,00
0,00
0,00

GRAIN COMPOSITION
(Continued)
Carbonate grains
Clastic Lime, Bio, Physico Ch.
Intraclasts
Algal Stromatolites
Pellets
Oolites
Pisolites
Ooids

Skeletal grains
Red algae
Green algae
Blue green algae
Arenaceous forams
Planktonic forams
Small bent. Forams
Large Forams
Milliolids
Oncolites
Phylloid alga
Grapitolites
Corals
Bryozoan
Echinoderms
Brachiopods
Molluscs
Gastropods
Sponge
Indeterminate bioclasts
OTHERS
Pseudomatrix
Car. Sideritic lam. Clays
Carbon streak

// nikol

Grain size means
Grain size range
Sorting
Roundness
Grain contacts
Structure

%
0,00
0,00
0,00
0,00
0,00
0,00
0,00

0,00
0,00
0,00
0,00
0,00
0,00
0,00
0,00
0,00
0,00
0,00
0,00
0,00
0,00
0,00
0,00
0,00
0,00
0,00
0,00
%
0,00
0,00

x nikol

TEXTURES
0,197 mm
0,093 – 0,482 mm
Moderately
Subangular – rounded
Concav convex – floating
-

MATRIX
Detrital clays
Carbonate mud
Volcanic glass
CEMENTS
Indeterminate clays
Dolomite
Calcite
Micrite
Siderite
Pyrite
Kaolinite
Illite
Quartz overgrowth
Ferroan oxide
REPLACEMENT
Calcite
Micrite
siderite
Dolomite
Pyrite
Kaolinite
Zeolite
Indeterminate clays
Chlorite
Silica
POROSITY
Intergranular
Intragranular
Fracture
Micropore
Mouldic
Micro intercrystalin
Dissolution

%
3,10
1,20
1,50
%
1,70
0,00
1,20
1,40
0,00
0,70
0,00
0,00
0,90
0,00
%
0,90
1,10
0,00
0,00
1,30
5,20
0,00
0,00
0,00
0,00
%
3,80
1,40
1,70
0,00
3,20
0,00
6,20

PETROGRAPHIC DATA SHEET

SAMPLE IDENTITY
Company
EMP
Well
B
Sample type
Core
Depth (ft)
5458,00
Formation
Lower Sihapas

GENERAL COMPOSITION
Particles
19,70
Other
0,00
Detrital Matrix
9,40
Replacement
39,40
Cements
11,50
Visibles pores
20,00
Total (%)
100,00

Rock Name

Sandstone

Classification

Subarkose (Pettijohn, 1975)

GRAIN COMPOSITION

%

Monocryst. Quartz
Straight extinction
Undolose extiction
Reworked

1,30
15,50
0,00

Feldspars
Potash Feldspars
Plagioclase
Rock Fragments
Igneous
(acid)
(basic)
Metamorphic
Polycrystalin qz
Low grade
Med grade
High grade
Sed. Rock fragments
Claystone
siltstone
Pyroclastic
Chert
Silisified grain
Accessory minerals
Glauconite
Carbonaceous mat.
Micas
Heavy minerals
Opaque minerals
Altered grain

1,70
0,50

0,00
0,70
0,00
0,00
0,00
0,00
0,00
0,00
0,00
0,00
0,00
0,00
0,00
0,00
0,00
0,00
0,00

GRAIN COMPOSITION
(Continued)
Carbonate grains
Clastic Lime, Bio, Physico Ch.
Intraclasts
Algal Stromatolites
Pellets
Oolites
Pisolites
Ooids

Skeletal grains
Red algae
Green algae
Blue green algae
Arenaceous forams
Planktonic forams
Small bent. Forams
Large Forams
Milliolids
Oncolites
Phylloid alga
Grapitolites
Corals
Bryozoan
Echinoderms
Brachiopods
Molluscs
Gastropods
Sponge
Indeterminate bioclasts
OTHERS
Pseudomatrix
Car. Sideritic lam. Clays
Carbon streak

x nikol

Grain size means
Grain size range
Sorting
Roundness
Grain contacts
Structure

TEXTURES
0,170 mm
0,040 – 0,253 mm
Poorly sorted
Subangular
Floating
-

%

MATRIX

0,00
0,00
0,00
0,00
0,00
0,00
0,00

0,00
0,00
0,00
0,00
0,00
0,00
0,00
0,00
0,00
0,00
0,00
0,00
0,00
0,00
0,00
0,00
0,00
0,00
0,00
0,00
%
0,00
0,00

Detrital clays
Carbonate mud
Volcanic glass
CEMENTS
Indeterminate clays
Dolomite
Calcite
Micrite
Siderite
Pyrite
Kaolinite
Illite
Quartz overgrowth
Ferroan oxide
REPLACEMENT
Calcite
Micrite
siderite
Dolomite
Pyrite
Kaolinite
Zeolite
Indeterminate clays
Chlorite
Silica
POROSITY
Intergranular
Intragranular
Fracture
Micropore
Mouldic
Micro intercrystalin
Dissolution

%
2,10
7,30
0,00
%
0,00
3,70
4,50
2,10
0,00
1,20
0,00
0,00
0,00
0,00
%
17,50
2,40
0,00
19,50
0,00
0,00
0,00
0,00
0,00
0,00
%
2,10
0,00
9,50
0,00
0,00
0,00
5,40

PETROGRAPHIC DATA SHEET

SAMPLE IDENTITY
Company
EMP
Well
B
Sample type
Core
Depth (ft)
5570,00
Formation
Lower Sihapas

GENERAL COMPOSITION
Particles
53,10
Other
0,00
Detrital Matrix
5,50
Replacement
4,90
Cements
13,70
Visibles pores
22,80
Total (%)
100,00

Rock Name

Sandstone

Classification

Sublitharenite (Pettijohn, 1975)

GRAIN COMPOSITION

%

Monocryst. Quartz
Straight extinction
Undolose extiction
Reworked

1,10
34,20
2,10

Feldspars
Potash Feldspars
Plagioclase
Rock Fragments
Igneous
(acid)
(basic)
Metamorphic
Polycrystalin qz
Low grade
Med grade
High grade
Sed. Rock fragments
Claystone
siltstone
Pyroclastic
Chert
Silisified grain
Accessory minerals
Glauconite
Carbonaceous mat.
Micas
Heavy minerals
Opaque minerals
Altered grain

2,80
1,40

1,40
2,30
2,10
0,00
0,00
0,00
0,70
0,00
0,00
0,00
0,00
3,70
0,00
1,30
0,00
0,00
0,00

GRAIN COMPOSITION
(Continued)
Carbonate grains
Clastic Lime, Bio, Physico Ch.
Intraclasts
Algal Stromatolites
Pellets
Oolites
Pisolites
Ooids

Skeletal grains
Red algae
Green algae
Blue green algae
Arenaceous forams
Planktonic forams
Small bent. Forams
Large Forams
Milliolids
Oncolites
Phylloid alga
Grapitolites
Corals
Bryozoan
Echinoderms
Brachiopods
Molluscs
Gastropods
Sponge
Indeterminate bioclasts
OTHERS
Pseudomatrix
Car. Sideritic lam. Clays
Carbon streak

x nikol

Grain size means
Grain size range
Sorting
Roundness
Grain contacts
Structure

%
0,00
0,00
0,00
0,00
0,00
0,00
0,00

0,00
0,00
0,00
0,00
0,00
0,00
0,00
0,00
0,00
0,00
0,00
0,00
0,00
0,00
0,00
0,00
0,00
0,00
0,00
0,00
%
0,00
0,00

TEXTURES
0,130 mm
0,030 – 0,657 mm
Poorly sorted
Subangular – rounded
Floating
-

MATRIX
Detrital clays
Carbonate mud
Volcanic glass
CEMENTS
Indeterminate clays
Dolomite
Calcite
Micrite
Siderite
Pyrite
Kaolinite
Illite
Quartz overgrowth
Ferroan oxide
REPLACEMENT
Calcite
Micrite
siderite
Dolomite
Pyrite
Kaolinite
Zeolite
Indeterminate clays
Chlorite
Silica
POROSITY
Intergranular
Intragranular
Fracture
Micropore
Mouldic
Micro intercrystalin
Dissolution

%
4,30
1,20
0,00
%
0,00
0,00
2,10
2,70
0,00
0,00
0,00
0,00
7,60
1,30
%
1,30
1,50
0,00
0,00
0,00
0,00
0,00
0,00
0,00
2,10
%
1,40
0,00
18,90
0,00
2,50
0,00
0,00

PETROGRAPHIC DATA SHEET

SAMPLE IDENTITY
Company
EMP
Well
B
Sample type
Core
Depth (ft)
5664,00
Formation
Lower Sihapas

GENERAL COMPOSITION
Particles
66,40
Other
0,00
Detrital Matrix
7,30
Replacement
8,50
Cements
8,50
Visibles pores
9,30
Total (%)
100,00

Rock Name

Sandstone

Classification

Lithic Arenite (Pettijohn, 1975)

GRAIN COMPOSITION

%

Monocryst. Quartz
Straight extinction
Undolose extiction
Reworked

3,60
37,50
4,30

Feldspars
Potash Feldspars
Plagioclase
Rock Fragments
Igneous
(acid)
(basic)
Metamorphic
Polycrystalin qz
Low grade
Med grade
High grade
Sed. Rock fragments
Claystone
siltstone
Pyroclastic
Chert
Silisified grain
Accessory minerals
Glauconite
Carbonaceous mat.
Micas
Heavy minerals
Opaque minerals
Altered grain

0,50
1,70

2,10
1,20
4,80
2,10
0,00
0,00
1,50
0,00
0,00
0,00
1,70
4,30
0,00
1,10
0,00
0,00
0,00

GRAIN COMPOSITION
(Continued)
Carbonate grains
Clastic Lime, Bio, Physico Ch.
Intraclasts
Algal Stromatolites
Pellets
Oolites
Pisolites
Ooids

Skeletal grains
Red algae
Green algae
Blue green algae
Arenaceous forams
Planktonic forams
Small bent. Forams
Large Forams
Milliolids
Oncolites
Phylloid alga
Grapitolites
Corals
Bryozoan
Echinoderms
Brachiopods
Molluscs
Gastropods
Sponge
Indeterminate bioclasts
OTHERS
Pseudomatrix
Car. Sideritic lam. Clays
Carbon streak

x nikol

Grain size means
Grain size range
Sorting
Roundness
Grain contacts
Structure

%
0,00
0,00
0,00
0,00
0,00
0,00
0,00

0,00
0,00
0,00
0,00
0,00
0,00
0,00
0,00
0,00
0,00
0,00
0,00
0,00
0,00
0,00
0,00
0,00
0,00
0,00
0,00
%
0,00
0,00

TEXTURES
0, 314 mm
0,040 – 0,478 mm
Moderately – well sorted
Subangular – subrounded
Floating – Point
-

MATRIX
Detrital clays
Carbonate mud
Volcanic glass
CEMENTS
Indeterminate clays
Dolomi