9-fracture modelling methodology.pdf
Transcript of 9-fracture modelling methodology.pdf
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Reservoir Geology Rev. 00 July 07/EP
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Fractured reservoir modelling
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Main critical points
Fracture porosity evaluation Matrix - fracture exchange factor Equivalent permeability evaluation
Interaction between fractures at different scale
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Different scale fractures
Faults and main brittle lineaments can be important oil paths during the production phase, but can also anticipate breakthrough of water and/or gas at the wells
Intermediate scale fractures usually connect the fracture network to the wells and represent the drainage fracture system
Microfractures represent the storage (together with matrix porosity, if any)
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Discrete Fracture Network (DFN) models and on the simulation of hydrocarbon flow within the fracture system by means of a finite element single phase simulator
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The ENI Suite
(Golder packages)
FRED (Fractured Reservoir Evaluation and
Development)
Model Construction
DFN generation
Properties assignment
DFN analysis
Grid construction (FredMesh)
Results visualization
MAFICOIL
Single Phase Flow Simulation
K_Comp, SIGMA_BLOCK
Single Phase Flow Simulation
FRACA (Beicip/IFP package)
DFN simulation available tools
The software development is
carried out by the FRED
Consortium, which is
sponsored by the following
companies:
Marathon Oil Company
ExxonMobil Corporation
Enterprise Oil -> Shell
ENI Agip Division
Norsk Hydro
Golder Associates
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The workflow An overview
Available data
Production data
Evaluation of static DFN models
Dynamic model
Static DFN final model
Production data
Evaluation of static DFN model
Ranking of conceptual models
UPSCALING
Optimization
phase
Optimization
phase
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enables us to face each kind of fractured reservoir and to build reasonable and successful models (both dual or single porosity and permeability).
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3D Model Petrel/
Earthvision
Property
model.
Petrel
Fracture network
conceptual model
FRED/SIBYLFRAC
Flow sim. within
fracture network
MAFICOIL /WILMA
Seismic interpret.
Structural model
Reservoir layering
Fracture potential maps
Seismic attributes maps
Fracture properties from core
Fracture properties from imaging log
Production logs and tests
Fracture properties from outcrop and/or
seismics
Simulation Grid
Petrel/Eclipse/Sure
Eclipse/Sure 2 models
Fracture Analysis
AFRODITE
Stress field map (Poly3D)
Upscaling
Grid_K, -Block
Software chain
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The workflow Data integration
Available data
Production data
Evaluation of DFN static models
Dynamic model
Static DFN final model
Production data
Evaluation of static DFN model
Ranking of conceptual models
UPSCALING
Optimization
phase
Optimization
phase
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Conceptual model
Conceptual model refers to a schematisation of reality that describes the main features of the fracture system that control hydrocarbon flow behaviour
the geological drivers .
The choice of a sound conceptual model, and hence the geological driver, enables us to distribute fractures in a sensible way, also in the area not checked by the wells
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Geological Drivers
Qualitative and quantitative information related to geological
characteristics of the field.
They are used as trend to distribute to the whole field:
the fracture network
curvature map
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fracture
intensity map
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Layering driven
Homogeneus Faults driven
Mixed
Advanced Modeling Techniques CONCEPTUAL MODELS