Study on the pre-stack seismic inversion prediction method for rich coal-bed-gas reservoirs: a case in southeastern Shanxi province

Pre-stack seismic inversion technique can combine sensitive parameters of oil and gas with many kinds of effective seismic information such as amplitude, offset, incidence angle, which will play a very important role in effective identifying oil and gas reservoirs. However, this technique still needs more work to do in prediction of coal-bed gas. This paper draws the idea of pre-stack seismic inversion for multi-parameter prediction. Through seismic modeling and measured data processing, we obtained various data volumes including P-wave velocity, S-wave velocity and density. With these data and elastic parameter equation, we used the methods of the Aki & Richard approximation formula and the pre-stack wide-angle inversion to search for sensitive parameters of coal-bed gas-bearing reservoirs. The application results on the coal-bed gas-bearing reservoir prediction in the Qinshui Basin show that the joint inversion method has good effects and we found the most sensitive elastic parameters of coal-bed gas reservoir. Comparison with the results of well logging curves indicates a high ratio of consistency, which proves that this method is feasible and practical.