--> ABSTRACT: Assigning Effective Values to Simulator Grid-Block Parameters: Heterogeneous Reservoirs, by S. H. Begg, R. R. Carter, and P. Dranfield; #91030 (2010)

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Assigning Effective Values to Simulator Grid-Block Parameters: Heterogeneous Reservoirs

S. H. Begg, R. R. Carter, P. Dranfield

Inspection of whole cores and logs from the Sherwood reservoir revealed it is extremely heterogeneous--containing short shales embedded in a mixture of sands and silts. A statistical approach was used to analyze core-plug porosity and permeability measurements and then discriminate between significantly different rock types. A successive rescaling procedure was then adopted in which we first calculated effective values for each rock type from the core-plug data. These results were then combined with the statistics of the spatial distribution of the rock types in order to calculate effective values for the nonshale part of each layer. Finally, the effect of the shales on the vertical permeability was incorporated. The resulting anisotropy ratios, of order 10-3, were used successfully in black-oil model studies to match observed production data with simulator predictions.

AAPG Search and Discovery Article #91030©1988 AAPG Annual Convention, Houston, Texas, 20-23 March 1988.