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Abstract: Reconciling Fracture and Test Previous HitPermeabilityNext Hit in 3d Heterogeneity Models

DALY, COLIN, Smedvig Technologies; ALISTAIR JONES, BP; KES HEFFER, BP; ANNE-LISE HEKTOEN, Norwegian Computing Centre; LARS HOLDEN, Norwegian Computing Centre; PETER KING, BP


Fractures can play a significant role in contributing to reservoir Previous HitpermeabilityNext Hit in some fields. The chief difficulty is that a sufficiently accurate knowledge of fracture Previous HitpermeabilityNext Hit in situ is rarely available. We propose a method of distributing fracture Previous HitpermeabilityNext Hit which takes into account test Previous HitpermeabilityNext Hit to provide a coherent description of reservoir Previous HitpermeabilityNext Hit.

Firstly, an attribute, S, related to fracture Previous HitpermeabilityNext Hit is identified and modelled throughout the field. In this case we use a strain model which is considered to provide a good causal link to the fracture Previous HitpermeabilityNext Hit. In is important that the variable chosen, S, may be modelled across the field and that at the wells there is a functional relationship between the variable and the Previous HitpermeabilityNext Hit. This relationship should be parametric, kf=f(S,Q) with parameters Q. Secondly, we must assign Previous HitpermeabilityNext Hit to the fractures. We use an empirical approach. The Previous HitpermeabilityNext Hit associated with the fractures is simply the difference between the dynamic Previous HitpermeabilityNext Hit obtained from well test and the Previous HitpermeabilityNext Hit of the matrix as measured by core, but since kf=f(S,Q) we simply use some curve fitting technique such as regression to find the best Q relating strain to the fracture component of Previous HitpermeabilityNext Hit. Since S is modelled over the field, this allows a model of kf in the reservoir. Finally, the well test Previous HitpermeabilityNext Hit is a further source of information. The Previous HitpermeabilityTop field previously obtained is then modified to account for this extra information. A technique based on kriging was used to account for the test information.

AAPG Search and Discovery Article #90937©1998 AAPG Annual Convention and Exhibition, Salt Lake City, Utah