RELATIONSHIP BETWEEN SEDIMENTARY FACIES OF LACUSTRINE CARBONATE ROCKS AND OIL AND GAS DISTRIBUTION

In this paper, carbonate rock of Shahejie Formation in Jiyang Depression of North China is used as an example, the characteristics of lithology, texture, palaeontology and sedimentation of the carbonate rocks were examined in detail. They were divided into three facies zones and five sub-facies zones. It is suggested that the carbonate rocks are of lakeshore, shallow water lacustrine and deep water lacustrine facies. The carbonate rocks intercalate in clastic rocks can be regarded as highly productive reservoirs, as well as geological and seismic marker beds. Among them, dolomites of bank subfacies has the best reservoir properties.