Abstract：Thin-sandstone reservoir is one of important realm of subtle reservoir exploration. The fan delta sand body developed in middle segment of ES3 of Wanzhuang structure in Lang-Gu depression is adjacent to oil-generating sag, which is of benefit to form the lithologic reservoir. But the thin thickness of sand beds and their rapid lateral variation resulted in incorrect prediction of sand body and difficult definition of lithologic traps. For that reason, The paper used a set of integrative reservoir prediction techniques such as high-precision seismic inversion, spectrum imaging and reservoir detection, preciously described distribution and spatial configuration of thin sand body, clarified developed zone of reservoirs and discovered and defined a lot of prospective lithologic reservoirs. The thick oil-bearing formations have been found in de-ploied 5 drilling wells based on the reservoir-predicted results from this integrative method, which further discovered and proved that Wanzhuang structure is complete 107 tons-rank reserve zone.
