Using 2D–3C Seismic Data to Discriminate the Sandstone Reservoir in Guang’an Gas Field

This paper describes the interpretation of 2D-3C seismic survey acquired in the Guang’an Gas Field of Sichuan Basin, which is located at the southwest part of China. Estimating reservoir parameters from geophysical data is vitally important in hydrocarbon exploration and production. We present a joint-inversion algorithm to estimate reservoir parameters directly, using both PP and PS seismic amplitude variation with offset (AVO) data. Reservoir parameters are linked to geophysical parameters through a rock-properties model. The joint inversion method for PP and PS seismic data solves approximated linear expressions of PP and PS reflection coefficients simultaneously using simulated annealing algorithm. By combining the two independent measurements (PP and PS seismic data) together, we stabilize the system of equations for PP and PS seismic data separately, leading to more robust parameter estimation.