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ABSTRACT: Improved Reservoir Modeling using Gridded Seismic Attributes: North Concho Bluff Field, West Texas

WATTS, GEORGE P., PETER H. LUFHOLM, and LARRY K. LOFTON

The North Concho Bluff Field produces from the upper Guadalupian tidal-flat sandstone play of the Queen Formation. Recently, waterflood production from the field had decreased to where it was barely generating a positive cash-flow. A reservoir simulation model was constructed in an attempt to improve earnings by identifying areas of oil potentially bypassed during waterflooding. The special coverage of modern well log and core data within the field, however was inadequate for the simulator study in describing the reservoir. A better method of describing the reservoir heterogeneity was needed.

A 3-D seismic volume was interpreted across the field. The reservoir interval consisting of four clastic cycles, encased by evaporites, produces a classic trough-over-peak seismic response. Seismic attribute mapping from the 3-D volume was used to better define the reservoir characteristics within the inter-well region. Final seismic-guided porosity and permeability grid files were used as inputs into a single layer reservoir model. History matching using these grids was accomplished with only minor adjustments to the model, as compared to using well data alone. The model identified an additional potential recoverable reserve target in excess of 2 MMBO.

AAPG Search and Discovery Article #90947©1997 AAPG Southwest Section Meeting, San Angelo, Texas