Shear waves differ from compressional waves in that their velocity is not significantly affected by changes in the fluid content of a rock. Because of this relationship, a gas-related compressional-wave "bright spot" or direct hydrocarbon indicator will have no comparable shear-wave anomaly. In contrast, a lithology-related compressional-wave anomaly will have a corresponding shear-wave anomaly. Thus, it is possible to use shear-wave seismic data to evaluate compressional-wave direct hydrocarbon indicators. This case study presents data from Myrnam, Alberta which exhibit the relationship between compressional- and shear-wave seismic data over a gas reservoir and a low-velocity coal.

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