P-Wave Attenuation in Reservoir and Non-Reservoir Rock

H033 Z-99 P-WAVE ATTENUATION IN RESERVOIR AND Abstract 1 NON-RESERVOIR ROCK G. MAVKO 1 AND J. DVORKIN 1 2 1 Geophysics Department Stanford University Stanford CA 94305-2215 USA; and 2 Rock Solid Images 2600 South Gessner Suite 650 Houston TX 77063 USA Wave-induced variations of pore pressure in partially-saturated rock or in fully-saturated elastically heterogeneous rock result in oscillatory liquid flow. The viscous losses during this flow are responsible for wave attenuation. The same viscous effects determine the changes in the dynamic elastic moduli of the system versus frequency. These changes are necessarily linked to attenuation via the causality condition.