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Diagenesis and porosity evolution of sandstone reservoir in the lower Jurassic Badaowan formation in Chepaizi area,Junggar basin

Wan Qingqing;Liu Luofu;Xiao Fei;Chang Min;Hu Qing;Zheng Shanshan;State Key Laboratory of Petroleum Resources and Prospecting,China University of Petroleum(Beijing);Basin and Reservoir Research Center,China University of Petroleum(Beijing);  
A major breakthrough has been made in oil and gas exploration in the Badaowan formation in the Chepaizi area of the Junggar basin,but the diagenesis research in this area is still relatively weak.A comprehensive diagenesis study of the strata was conducted through various test methods.Thin section and SEM observation were conducted to determine diagenetic type and sequence.Cathodoluminscence(CL)was used to identify the period of calcite cementation,development degree of quartz overgrowth and distribution characteristics of kaolinite.The composition of clay minerals and the content of each mineral were determined by X-ray diffraction.Formation temperature of authigenic calcite cement was determined by oxygen isotope analysis.The evolution processes of reservoir porosity were quantitatively studied by inversion and back-stripping method.The results show that the reservoirs are mainly subjected to compaction,cementation of calcite,quartz,pyrite and the dissolution of feldspar and quartz.Formation temperatures of calcite cement range from 40℃to 85℃,corresponding to diagenetic stage between late eodiagenetic phase A and eodiagenetic phase B.Clay minerals are dominant with kaolinite due to feldspar dissolution.The process of reservoir porosity evolution can be divided into three stages:Rapid compaction stage,compaction-cementation stage and compaction-dissolution stage.The results provide a geological basis for the oil and gas exploration of the Badaowan formation in the Chepaizi area.
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