Abstract: A set of dolomite, marl and oil shale developed on Es1 formation in Zhangdong district, and the fractures were well developed. At present, the region has entered the preparatory stage of the development plan implementation, it's necessary to make clear the characteristics of special reservoirs and the fracture distribution regularity. Based on drilling data, the macroscopic distribution regularity of dolomite reservoirs was made clear. By using core data analysis, cathode luminescence and the casting thin sections and other technical means, the dolomite pore type and crack development pattern were analyzed. In the end, the pre-stack seismic anisotropy and stress field were used in process of studying the fracture distribution. The predicted results of the fracture distribution had a high agreement degree with the oil production test, which proved the reliability of the research results and provided a good technical support for the development plan implementation.