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《Acta Geologica Sinica》 2016-03
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The Ordovician Thermal Evolution and Hydrocarbon Generation History in the Southwestern Margin of Weibei Uplifting of the Ordos Basin:A Case Study of the Linyou-Xunyi Region

CAO Zhanpeng;REN Zhanli;XIONG Ping;QI Kai;CHEN Zhanjun;Department of Geology,Northwest University;Hanzhong Team,Shaanxi Geological and Mineral Survey and Development Corporation;  
Through paleogeothermal recovery method and basin-modeling method this study reconstructed paleogeothermal gradient,thermal evolution history and hydrocarbon generation history in the southwestern margin of Weibei Uplifting of the Ordos Basin during the Ordovician period.Temperaturedepth curve for borehole shows that the present paleothermal gradient of Weibei uplifting is 3.12℃/100 m.This region entered rapid subsidence stage in the Permian and Triassic,the slow subsidence stage from early Jurassic to early Cretaceous,and the uplifting stage after the late Cretaceous,with an erosion thickness between 1100 m to 1300 m.The Ordovician source rock of the Xunyi area entered oil-generation window in early Permian(270 Ma) and maturity oil-generation in late Triassic(210 Ma),and finally reached large gas generating episode in late Jurassic(150Ma).In late Cretaceous(96 Ma),the Ordovician source rock had a maximum burial depth and the highest paleogeotherm,forming a peak period for natural gas-generation.Paleogeothermal recovery and simulation indicate that the Xunyi area had a geothermal gradient up to 5.0℃/100 m in early Cretaceous which is the main gas-generation period.
【Fund】: 国家自然科学基金项目(编号41372128);; 国家重大专项(编号BJ08133-1);; 西北大学大陆动力学国家重点实验室(编号BJ08133-1)资助的成果
【CateGory Index】: P618.13
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