GEOLOGIC FRAMEWORK AND RESERVOIR DISTRIBUTION, TENGIZ FIELD, KAZAKHSTAN

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GEOLOGIC FRAMEWORK AND RESERVOIR DISTRIBUTION,
TENGIZ FIELD, KAZAKHSTAN

• Paul M. (Mitch) Harris
• ChevronTexaco Energy Technology Company
• San Ramon, California U.S.A.

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BEG TALK OUTLINE
Introduction to Region and Stratigraphy of
Field Platform Facies, Stratigraphy and
Reservoir Character Flank Facies and Reservoir
Character Summary
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CARBONIFEROUS PLATFORMS IN CASPIAN BASIN
Map From Cook et al., 2000
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TENGIZ- STEEP-SIDED ISOLATED PLATFORM
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After Weber et al., 2003
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TENGIZ PLATFORM AND SEISMIC FACIES
DISTALSLOPE
PLATFORM
UPPER SLOPE
MID-SLOPE
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TENGIZ SEISMIC AND LITHOFACIES
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Honors Seismic, Well, Biostratigraphic,
and Outcrop Analog Data
After Weber et al., 2003
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BEG TALK OUTLINE
Introduction to Region and Stratigraphy of
Field Platform Facies, Stratigraphy and
Reservoir Character Flank Facies and Reservoir
Character Summary
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Implication Reservoir Boundaries and Coarse
Layering Scheme
After Weber et al., 2003
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DETAILED STRATIGRAPHIC FRAMEWORK
T-41
T-5056
T-5050
T-22
T-463
Potential Layering Scheme for Detailed Reservoir
Models
After Weber et al., 2003
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PLATFORM ENVIRONMENTS
UPPER MIDDLE SLOPE
LOWER SLOPE TOE OF SLOPE
SHALLOWPLATFORM
BASIN
DEEPER PLATFORM
SHALLOW PLATFORM
PLATFORM BREAK
OOID, PELOID, SKELETAL GRAINSTONE/PACKSTONE
GRAINSTONE PACKSTONE
PACKSTONE GRAINSTONE
mB
mB
DEEPER PLATFORM
SHALLOW PLATFORM
OOID, PELOID, SKELETAL GRAINSTONE/PACKSTONE
mB
SKELETAL PELOID GRAINSTONE/PACKSTONE
mB
mB
SKELETAL PELOID PACKSTONE/GRAINSTONE MICROBIAL
BOUNDSTONE
MICROBIAL
Basin Floor
BOUNSTONE
T 5050
T 5246
T 5857
Platform
AND
T 5034
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SLOPE
DEBRIS
Present-Day Structural Rim
T
T 6846
T 6337
T 7252
PLATFORM DEBRIS SPICULITIC LIME MUDSTONE
Slope
Basin Floor
S
Platform Break
Up to 10 kilometers
Several kilometers
After Weber et al., 2003
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After Weber et al., 2003
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Potential Layering Scheme for Detailed Reservoir
Models
After Weber et al., 2003
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(No Transcript)
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Template for Porosity Distribution in Detailed
Reservoir Models
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After Weber et al., 2003
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After Weber et al., 2003
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After Weber et al., 2003
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BEG TALK OUTLINE
Introduction to Region and Stratigraphy of
Field Platform Facies, Stratigraphy and
Reservoir Character Flank Facies and Reservoir
Character Summary
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Stratification Dominates
RESERVOIR ARCHITECTURE MDT PRESSURE PROFILES
T-5056 T-7252 T-5857
T-220
T-5050
Fractures Dominate
Bashkirian
Serpukhovian
Vertical perm baffles in platform Vertical
connectivity in flank
T-463
Fractures Dominate
Late Visean
Early Visean
T-47
T-6337
Stratification Dominates - Virgin Pressure
Fractures Dominate
Fractures Stratified
Tournaisian
Devonian
original pressure
original pressure
original pressure
original pressure
original pressure
Dolomite connected by fractures
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EVIDENCE OF FRACTURES Lost Circulation
Map Flow Capacity Index Map
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Serpukhovian
Visean
Tournaisian
Harris, 2001
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SEISMIC CHARACTER OF TENGIZ FLANK
AUTOBRECCIA FACIES WITH LOCAL HIGHER POROSITY OR
FRACTURED ZONES
CARBONATE DEBRIS BEDS WITH THIN INTERFINGERING
SHALES
THICK BASINAL SHALE WITH DISTAL CARBONATE BEDS
High amplitude discontinuous
Platform/Rim
Low amplitude dipping with onlaps
Upper Slope
High amplitude parallel, cyclic
Mid Slope
Distal Slope
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Harris, 2001
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FLANK ARCHITECTURE

• Facies-based rock regions for Porosity and Perm
  

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FRACTURES IN FLANK
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BEG TALK OUTLINE
Introduction to Region and Stratigraphy of
Field Platform Facies, Stratigraphy and
Reservoir Character Flank Facies and Reservoir
Character Summary
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RESERVOIR MODEL LAYERS
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POROSITY CROSS-SECTIONS
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PREDICTION OF FRACTURE DENSITY
Fracture density
Input to Neural Net
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CONCLUSIONS
Temporal and spatial variability in reservoir
quality observed on platform Matrix permeability
controlled primarily by intergranular porosity
Slope microbial boundstone and debris form
reservoirs with distinctive seismic facies and
production/performance characteristics
Fractures contribute to non-matrix permeability
in well-cemented boundstones. Tengiz appears
to be a relatively indivisible, hydrodynamically
linked reservoir.