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《Journal of Chengdu University of Technology(Science & Technology Edition)》 2009-06
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Dynamic coupling mechanism between Longmenshan and Sichuan Basin and its impact on the hydrocarbon migration in West Sichuan based on the analysis of the characteristics of Wenchuan earthquake

CAO Jun-xing1,2,LIU Shu-gen1,HE Xiao-yan2,ZHAO Liang2 1.State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation,Chengdu University of Technology,Chengdu 610059,China 2.College of Information Engineering,Chengdu University of Technology,Chengdu 610059,China  
The Wenchuan earthquake in 2008 offers us a new perspective and evidences to analyse the interaction and dynamic coupling mechanism between the Longmenshan and Sichuan Basin in the formation and evolution of the mountain-basin system.Based on summarization of the strata and structural features of the mountain-basin system and the characteristics of the Wenchuan earthquake,the authors analyse the modern dynamic coupling mechanism between Longmenshan and Sichuan Basin and its impact on the hydrocarbon migration in the West Sichuan deep strata.The formation and evolution of the Longmenshan and the earthquake preparation in the Longmenshan is dominanted by the unsymmetric bilateral stresses of the thrusting pressing stress from the Songpan-Ganzi block on the west side and the subduction pressing stress from the Sichuan Basin on the east side.The geologic-tectonic features and tectonic environment of the south segment and north segment of the Longmenshan are quite different.The Longmenshan began to uplift at Late Triassic,earlier than the uplift of the Tibet plateau.Thus,the formation of the Longmenshan has nothing to do with the India-Asia plate collision.However,the evolution of the Longmenshan is dominanted by the India-Asia plate collision and the subduction of the Pacific plate since Himalayan period.The thrusting and folding deformation of the Longmenshan orogenic zone gradually expands from northwest to southeast,i.e.from the Songpan-Ganzi block to Sichuan Basin.The fault zones extending along the strike of the Longmenshan dominate the distribution of the natural gas accumulation zones in West Sichuan.The hydrocarbon in the hanging wall strata of the Guanxian-Jianyou fault may has dissipated in geological historic large earthquakes in the Longmenshan.The Dayi-Guangyuan buried fault is propitious to the formation of the shallow gas reservoirs with a deep hydrocarbon source in the West Sichuan foreland basin.
【Fund】: 国家自然科学基金委员会与中国石油化工股份有限公司联合基金资助项目(40739907);; 高等学校博士学科点专项科研基金资助项目(200806160008)
【CateGory Index】: P618.13
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