Diagenetic products of Shahejie Formation in central uplift belt of Dongying depression and their significance to hydrocarbon fluids
This study aims to determine the stage characteristics,sequence,and oil and gas filling characteristics of various diagenetic phenomena in the central.uplift zone of Dongying Depression.By anal.yzing the fluorescence characteristics,contact relationship with asphal.tene,inclusion characteristics,carbon and oxygen isotope characteristics,and characteristics of trace elements of diagenetic products from different stages,we identify diagenetic products that have indicative relationships with hydrocarbon containing fluids.The research results indicate that three stages of oil and gas filling can be identified through the contact and metasomatic relation-ship between diagenetic mineral.s and asphal.tene.The contact and metasomatic relationships are sedimentary contact,fault contact,and intrusive contact,respectively.The diagenetic products corresponding to the three stages of oil and gas filling in the central.uplift zone of Dongying Depression in sequence are brown yellow authigenic kaolinite and the diagenetic combination of feldspar dissolution and undeveloped kaolinite,pyrite distributed in a chain bead shape,and late iron dolomite cement.The diagenetic products developed in the central.uplift zone of Dongying Depression have multiple types and stages,which is of great significance for restor-ing the process of oil and gas accumulation in the basin.
water rock reactiondiagenetic sequencehydrocarbon Bearing fluidhydrocarbon mineral.s
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