An Experimental and Modeling Study on the Response to Varying Pore Pressure and Reservoir Fluids in the Morrow A Sandstone

Figure 9

P- and S-wave velocities for the low-permeability number 1 sample versus differential pressure for dry rock, brine saturated, and when flushed with live oil, the oil-CO₂ mixture, and CO₂. (Note dry rock velocities were recorded at 20°C, fluid-saturated velocities were recorded at 63.9°C.)

(a) P-wave velocities for the low-permeability number 1 sample versus differential pressure

(b) S-wave velocities for the low-permeability number 1 sample versus differential pressure