The Relationship Between The Tectonic Evlution And Hydrocarbon Accumulation In The East Part Of Bachu-margit Area In Tarim Basin

Bachu-Margit eastern area,located in the east part of Margit Slope in Tarim basin,is one of the key areas of Tarim Basin with great exploration potential.Based on the latest seismic data interpretation,this article focuses on the structural deformation and tectonic evolution characteristics of the major reservoir controlling fault zones,including Yubei1,East Niaoshan and Mazhatage fault zone;Through the simulation of the single well burial history and thermal history,the thermal evolution and maturation process of source rock are discussed and the matching relationship between the fault evolution stage and hydrocarbon accumulation process is established in the study area,so the author build the oil&gas accumulation model of the Bachu-Margit eastern area,Tarim basin.The research results show that the structural styles of the major reservoir controlling fault zone in the study area mainly includes basement involvement type,cap rock decollement and compound superposition type;The fault zones have clearly layered and the structural style is variable along its trend;using the method of equilibrium profile,the author analyzes the evolutionary process of the major reservoir controlling fault zones,which mainly manifested as the resurrection of early Caledonian,the cover strong thrust activities of Middle Caledonian Early Episodes?I Episodes of Middle Caledonian?III Episodes of Middle Caledonian,the cover successive thrust activities of Late Caledonian-Early Hercynian?Late Hercynian and Early Himalaya,the shallow detachment thrust activities of the Late Himalaya.The burial history and thermal history of the strata are closely related to the tectonic evolution of the petroliferous basins,and play an important role in controlling the formation?migration and accumulation of oil and gas.With simulating and analying the burial history & thermal history of Yubei 1?Yubei 5?Yubei 9?Shan 1 and Ma 4 drillings in the study area and combining with the characteristics of the typical hydrocarbon reservoirs,the author establishes the hydrocarbon accumulation model which is ?The Cambrian strata supplied hydrocarbon,Oil and gas were migrated by faults and unconformities,Fractured reservoir,Hydrocarbon accumulation was in late Hercynian,Oil and gas were adjusted for gas reservoir in Himalayan.