[First Hit]

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Herve Jourde1, Atilla Aydin1, Louis Durlofsky2
(1) Rock Fracture Project, Stanford University, Stanford, CA
(2) Department of petroleum Engineering, Stanford, CA

Abstract: Fault Zone Previous HitPermeabilityNext Hit Upscaling: From Field to Numerical Modeling

We will present a Previous HitpermeabilityNext Hit upscaling methodology using quantitative analog data from a faulted sandstone. Structure of faults resulting from slip along pre-existing joint zones and Previous HitpermeabilityNext Hit of each feature of the fault zone determined from various techniques are incorporated in a numerical procedure used to upscale the Previous HitpermeabilityNext Hit tensor of blocks comprising parts of the fault zone. In order to determine their upscaled Previous HitpermeabilityNext Hit properties, the large blocks are discretized in smaller grid blocks. At small slip magnitude, cross-plots of upscaled Previous HitpermeabilityNext Hit calculated for each grid block indicate that fault-parallel Previous HitpermeabilityNext Hit is strongly increased compared to the host rock and that fault normal Previous HitpermeabilityNext Hit is noticeably reduced. At large slip magnitude, although increased slip leads to higher density of shear-induced joints, fault-parallel Previous HitpermeabilityNext Hit is not necessarily increased and fault normal Previous HitpermeabilityNext Hit does not systematically decrease, which is related to the variability in the orientation of joints. Results of upscaling give a principal Previous HitpermeabilityNext Hit direction between mean joint trend and mean fault strike for faults with a small amount of slip. For larger slip values, the principal Previous HitpermeabilityTop direction approaches the mean fault strike. The validation of this upscaling methodology through in situ infiltration tests will be discussed.

AAPG Search and Discovery Article #90914©2000 AAPG Annual Convention, New Orleans, Louisiana