In a U.S. Midcontinent gas field, a channel feature contained shale and reservoir sands ranging in porosity from 6% to 20%. Well logs, core data, and 3D seismic data were combined in a reservoir characterization study to map the lithology and variability of porosity within the target sand. The project was conducted in two phases—a qualitative, uncalibrated seismic attribute study and a detailed well-log-calibrated reservoir characterization.

In the first phase, multiple seismic attributes were computed and a statistical tool was used to combine them to illuminate variations in lithology and porosity. These rapidly computed “hybrid” attributes can reveal important structural...

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