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The AAPG/Datapages Combined Publications Database
Four Corners Geological Society
Abstract
Case History: Rulison Field, Colorado, Fracture Detection, Mapping, and Analysis of a Naturally Fractured Gas Reservoir Using P-wave Reflection Seismic
Abstract
This case history is part of one of three field projects funded by the U.S. Department of Energy as part of its ongoing research effort aimed to expand current levels of drilling and production efficiency of naturally fractured tight gas reservoirs. The acquisition, processing, and interpretation techniques described herein enabled the combined evaluation of two narrow-azimuth (source-receiver azimuth) 3D P-wave volumes for azimuthal 
anisotropy
and for the evidence of gas accumulation. The two seismic attributes best correlated with commercial gas pay were: the interval velocity ratio (N60E/N30W) and the sum of the interval AVO gradient (N60E + N30W), for the interval of the gas-saturated Mesaverde (the target reservoir).
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