Abstract: Central Lixian slope of Raoyang sag is a favorable area for carbonate development, which is dominated by biolithite limestone, oolitic limestone and dolomitic limestone. Now industrial oil run has been got or good hydrocarbon indication has been seen in many wells of the series of strata, which presents the exploration potential of carbonate in lower submember of the fi rst member of Shahejie Formation. In the past two years, such techniques as the integration of well logging and seismic, core slice observation, log interpretation, and core facies analysis have been used for in-depth research on carbonate sedimentary reservoir features in lower submember of the f irst member of Shahejie Formation, clarifying the planar distribution and favorable oil-bearing facies belt of the carbonate here. Carbonate reservoir here features in middle porosity and middle permeability, structural-lithologic and lithologic strata are dominant reservoir types, and reservoir-forming conditions are complicated and controlled by sedimentary microfacies and reservoir physical property. Gaoyang area is located in shallow lake, carbonate in lower submember of the f irst member of Shahejie Formation is the thickest, and biolithite limestone and oolitic limestone mainly developed. Xiliu area is located in fairly deep lake, where dolomitic limestone mainly developed and reservoir physical property is the best. The two areas are focal zones for carbonate exploration in central section of Lixian slope