Elastic Moduli Sensitivity to Reservoir Pore Fluids

Mohammed G. Al-Otaibi¹

(1) Saudi Aramco, Dhahran, Saudi Arabia.

A detailed seismic modeling work has been carried out to identify the most appropriate elastic rock modulus (or moduli) that are sensitive to reservoir pore fluid types. This work is being applied to both oil and gas bearing clastic and carbonate reservoirs from different fields within Saudi Arabia. The sensitivity of each modulus to the reservoir pore fluid saturation was also analyzed. Among those moduli are Vp/Vs ratio, lambda-Rho, and bulk modulus. Modeling results ranked investigated elastic moduli with regards to their effectiveness as “fluid indicators”. These results also set rules of thumb as to which modulus is suitable for a given set of reservoir conditions.