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《Petroleum Geology and Recovery Efficiency》 2020-04
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Development mode and geochemical characteristics of Carboniferous source rocks in Junggar Basin

WANG Shengzhu;WANG Qianjun;ZHANG Guanlong;BAI Zhongcai;XIONG Zhengrong;MEI Wenke;ZHAO Leqiang;Exploration and Development Research Institute,Shengli Oilfield Company,SINOPEC;  
The Carboniferous strata is important for hydrocarbon exploration in Junggar Basin,and its hydrocarbon accumulation is mainly controlled by source rocks. Identifying geochemical characteristics of the Carboniferous source rocks is significant to determine the effective source rocks in detail and to guide hydrocarbon exploration. The outcrop and drilling samples of source rock were systematically collected and the analysis methods were used including organic carbon content,rock pyrolysis,chromatography-mass spectrometry saturated hydrocarbon,single hydrocarbon carbon isotope,and experiment of hydrocarbon generation thermal simulation in gold tube-autoclave to study the geochemical characteristics and hydrocarbon generation capacity of source rocks. The results show that there are five types of source rock development modes of the Carboniferous strata in Junggar basin resulted from five types of sedimentary settings,namely residual ocean(sea),back-arc basin,intra-arc basin,marine rift,and continental rift basins. The source rocks in different sedimentary environments show different geochemical characteristics,and can be divided into 5 types,including Well Wucan1 type source rock,Dishuiquan type source rock,Wucaicheng type source rock,Zaheba type source rock,and Dixi8 well type source rock.The hydrocarbon generation capacity of source rocks developed in different sedimentary environments have huge difference.Among them,the source rocks in back-arc basin and intra-arc basin show strong hydrocarbon generation capacity and are high-quality source rocks,and the generated hydrocarbon is an important exploration target.
【Fund】: “十三五”国家科技重大专项“准噶尔盆地碎屑岩层系油气富集规律与勘探评价”(2016ZX05002-002);; 中国石化科技攻关项目“石炭系领域油气成藏规律及目标评价”(P17001-4)
【CateGory Index】: P618.13
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