Comprehensive geological study and target optimization in the 4th Member of Shahejie Formation in the Gaocun-Gaoyi area, Jinxian Sag, Bohai Bay Basin

The degree of oil exploration and development of each layer in the Gaocun-Gaoyi area of Jinxian Sag in Jizhong Sag,Bohai Bay Basin is unbalanced. The remaining oil and gas resources in the 4th Member of Shahejie Formation are abundant, showing fairly good productive potentials in this area. Through the detailed dissection on Zhao 76 fault block reservoir, combined with the technical means of fine stratigraphic correlation, horizon calibration, fine structure interpretation, sand body distribution and sedimentary facies study, it is clear that the oil-gas accumulation in the 4th Member of Shahejie Formation are dominated by lithology and tectonic. Comprehensive research shows that lithological-structural reservoir and lithological reservoir are the main potential tapping orientations in the next step, and two favorable prospects are prioritized.