Jingye Li Wang Shoudong
The effective pressure monitoring is very important to the management of the gas reservoir. In this paper, we presented a case of pressure monitoring in the thin inter-layer gas reservoir by time-lapse seismic method. During this study, the novel time-lapse seismic difference impedance inversion method was presented based on pre-stack elastic impedance inversion theory. The computational experiments show that the relationships constructed on the log data and the core lab data can not be used to compute the thin inter-layer reservoir parameters variations from the P wave and S wave impedance and their differences, such as pressure and saturation. The reason is that the measurement scale differences between seismic data and log data make the relationships inconsistent. Therefore, the accumulative attributes are tested, verified, and then applied for pressure variation prediction on the inversed impedance differences. The computed results have good conformance with the matters of fact of the real gas reservoir.
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