Carbonate Seismic Rock Physics Modeling and Hydrocarbon-detection

Carbonate reservoirs accounted for more than 50% of total reservoirs worldwide, however, the carbonate reservoir is characterized by complex structure and strong heterogeneity, seismic reservoir characterization is facing enormous challenges. This paper focuses on the dolomite reservoir of Majiagou formation in Jingbian gas field, Changqing Oilfield, the biggest oilfield in China. Through analysis of amounts of drilling, logging and testing data, the author clarify the key factors affecting the velocity of dolomite. For the first time the empirical equations of Vp, Vs and dolomite’s density, shale content (Vsh) and gas saturation were established for the study area. The sensitive factors of lithology and fluids are selected. With prestack simultaneous inversion and cross plots of sensitive factors, the most prospective area was selected and has been proved by the drilling results. Through this study, the technology of seismic characterization for dolomite has been set up.