Rock physics and AVO effects in Mississippian-age rocks ///
In the Western Canadian Sedimentary Basin (WCSB), carbonates are often encountered at depths of 3,000 m or more, but the formations discussed here are found at 1,500-m depth; reflections from these shallower depths will be somewhat liberated from the distortions experienced by wavefronts traveling from deeper reflectors. Also, these carbonate sequences are usually studied in the Rocky Mountain foothills; but this basin is located in the plains, where data is unencumbered by structural complexities.
These formations are of interest for several reasons. The Mississippian Madison Group-aged carbonates have high porosity (28%), which is high for this group. It is found that thin carbonate reservoirs giving composite reflections may show up moderate values of LambdaRho for high porosities, which are confirmed by low impedance values.
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