NON-MARINE SEDIMENTARY FACIES AND DISTRIBUTION OF SOURCE ROCKS AND RESERVOIRS IN CHINA

For scores of years,the petroleum exploration of China has been mainly targeted at non-marine sedimentary facies.However,the relations of sedimentary patterns with source and reservoir rocks are roughly as follows:source rocks occurred in deep lacustrine,hypabyssal lacustrine and paludal facies,while reservoir rocks could be developed in various environments,in China being predominated by deltaic facies,alluvial fan and shallow lake beach-bar,as well as the weathering crust of basinal basement rocks.During the process of sedimentation,the source and reservoir rocks generally occurred in cycles,which can be grouped into source-reservoir-cap assemblages distinguished as 4 types i.e.lower,upper,auto-land lateral geneses.