Abstract
Distinguishing between pressure and saturation is important when monitoring injection in hydrocarbon reservoirs and potential CO2 sequestration sites.Here, we investigate the possibility of using both velocity and attenuation changes derived from prestack time-lapse datasets to distinguish between gas saturation and effective pressure changes. Seismic attenuation is very sensitive to changes in gas saturation and effective pressure so by introducing this measurement, separation of pressure and saturation changes can potentially be made more robust. Quantitative interpretation of the results is made via a Monte Carlo based method utilizing an empirical relationship. Qualitative measurements are made of gas saturation changes using knowledge from theoretical relationships.
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