SEDIMENTARY SLOPES OF THE BOHAI GULF BASIN AND THEIR OIL POTENTIAL

Sedimentary slopes of the Bohai Gulf basin may be divided into three types and four kinds according to their structures,and four kinds of corresponding sedimentary sequences are distinguished.The sand bodies may be divided into eight types of reservoir according to the sedimentary facies,with the fluvial delta sand being the best reservoir.Four reservoir distribution models of slopes are constructed and the basic conditions of hydrocarbon accumulation in slopes are summed up.Comparison of the four kinds of slope indicates that the concave slope type is the best oil-bearing one.Suggestions of petroleum exploration in the slopes of the Jizhong depression have been put forward.