Fluid prediction for paleokarst carbonate reservoir

Ordovician paleokarst carbonate reservoirs are widely developed in the Tahe Oilfield, China. The storage space is complex, mainly including dissolved caves, pores and fractures, which significantly influence the seismic velocity. In order to accurately discriminate the saturated pore fluids, DEM-Gassmann rock physic model is employed to address this complex reservoir before pre-stack inversion. Based on the fluid substitution results from a field well, the feasibility of fluid identification at this area is discussed through systematically modeling and pre-stack inversion. In particular, the subsequent 2D/3D field fluid distribution results have a considerable coherence with oil testing results. This integral strategy and corresponding results are definitely beneficial for exploration/exploitation in that area.