In this article, the author introduces a time-lapse seismic inversion method based on the difference of seismic data at different<br>times. Based on the synthetic model bSuilt from the real data, pore pressure change SSSSin a gas reservoir is computed. Also<br>we predicted the reservoir pressure variation for a China offshore gas field as a real case study. Model experiment and real<br>data application to describe the gas pressure variation show that this method is practical and efficient.


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