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The limitations of using low-frequency 3-D seismic data for detailed reservoir characterization are well recognized. Nonetheless, these data are very well suited for quantitative estimates of the net-to-gross (N/G), which is a reservoir scale property critical in deepwater turbidite reservoir characterization and development projects. The acoustic impedance inversion of 3–D seismic has been routinely used with varying success to estimate N/G in many clastic reservoirs. Indeed, when the shale baseline impedance can be estimated, the departure from this trend can be argued to represent a certain measure of the hydrocarbon-saturated sand volume on the reservoir scale. We take this technique a step further by using both acoustic and shear impedance (AI and SI) and applying them to Horn Mountain deepwater reservoirs, Gulf of Mexico (GOM), where six appraisal wells were available for calibration.
Vernik et al. (Mon,) studied this question.