Velocity Measurements of Conglomerates And Pressure Sensitivity Analysis of AVA Response Available to Purchase

During hydrocarbon depletion and enhanced oil recovery, the pore pressure and the fluid saturation levels in the reservoir will change. These changes can be reflected from the time-lapse seismic data. In order to better understand the AVO changes and time shift of the time-lapse data, P- and S-wave velocities were measured on a series of low porosity conglomerates under different confining and pore pressures and under both dry and water saturated conditions using standard pulse transmission methods. To better understand the time-lapse seismic data, we also performed the pressure sensitivity analysis of the P-P and P-SV reflectivity on a simple two layer interface using complete Zoeppritz's equations based on the laboratory velocity measurement. The result suggests that both of the P-P and P-SV reflections are very sensitive to the effective pressure at low effective pressure.