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A rock physics core study was successfully conducted to<br>investigate the effects different fluids and reservoir<br>pressure changes have on the velocity of carbonate<br>rocks. Eighty vertical core plugs representing all<br>reservoir and non-reservoir facies over a Cretaceous<br>interval of interest were selected for use in this study.<br>Dense non-reservoir facies with low porosity and<br>permeability showed minor to no velocity changes to<br>pressure changes. The velocity of reservoir facies with<br>significant porosity and permeability were observed to<br>change with fluid type, effective pressure and porosity.<br>Samples with higher porosity and more heterogeneity<br>showed the most velocity change with pressure. Based<br>on the ultrasonic velocity results, saturation changes will<br>produce larger velocity changes than pressure changes<br>in the reservoir.