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The AAPG/Datapages Combined Publications Database
AAPG Bulletin
Abstract
AAPG Bulletin, V.
2011. The American Association of Petroleum Geologists. All rights reserved.
DOI:10.1306/09131009132
The impact of
fault
envelope structure on fluid flow: A screening study using
fault
facies
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Muhammad Fachri,1 Jan Tveranger,2 Nestor Cardozo,3 Oystein Pettersen4
1Centre for Integrated Petroleum Research (CIPR), University of Bergen, Realfagbygget, Allegaten 41, N-5007 Bergen, Norway; present address: Department of Earth Science, University of Bergen, Realfagbygget, Allegaten 41, N-5007 Bergen, Norway; [email protected]
2Centre for Integrated Petroleum Research (CIPR), University of Bergen, Realfagbygget, Allegaten 41, N-5007 Bergen, Norway; [email protected]
3Department for Petroleum Engineering, University of Stavanger, 4036 Stavanger, Norway; [email protected]
4Centre for Integrated Petroleum Research (CIPR), University of Bergen, Realfagbygget, Allegaten 41, N-5007 Bergen, Norway; [email protected]
ABSTRACT
Structural elements of deformation-band fault
zones are implemented as volumetrically expressed building blocks, that is,
fault
facies, in a series of synthetic reservoir geomodels and simulation models. The models are designed and built to reproduce a predefined range of
fault
system configuration, sedimentary facies configuration, and
fault
zone architecture. Using petrophysical properties derived from published field studies, the geomodel realizations are run in a reservoir simulator to monitor reservoir responses to variations in modeling factors. The modeled
fault
zones act as dual barrier-conduit systems, resulting in simulation models that can capture contrasting waterfront velocities, changes in waterfront geometries, and flow channelizing and bifurcation in the
fault
envelopes. The simulation models also show the development and sweep efficiency of bypassed oil and poorly swept regions because of the presence of the
fault
zones. Statistical analysis reveals that the
fault
facies modeling factors can be ranked according to impact on reservoir responses in the following descending order:
fault
core thickness, the type of displacement function, sedimentary facies configuration, the fraction of total
fault
throw accommodated by
fault
core and damage zones,
fault
system configuration, and maximum damage zone width.
Fault
core thickness is the most important factor because it governs the space available for fluid flow in the
fault
-dip direction. Other modeling factors affect the reservoir responses by controlling the geometry and continuity of fluid flow paths in the modeled
fault
zones.
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