Fault characteristics and its control on hydrocarbon accumulation in Xianbazha area of Markit Slope, Tarim Basin
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摘要: 通过对三维地震剖面的解释,认为先把扎地区除了发育逆冲断裂,新发现了广泛发育的走滑断裂.断裂纵向上具有明显的分层性,在空间上相互叠置.断裂的演化经历了加里东中期、海西晚期和喜马拉雅山期3个时期;断裂对油气成藏具有重要的控制作用,加里东中期小型逆冲断裂作为大气淡水通道有利于岩溶储层发育;海西晚期走滑断裂作为深部流体活动通道,有利于热液储层发育,先把扎断裂则控制上古生界圈闭发育;走滑断裂作为油气垂向运移通道,有利于上古生界油气聚集,制约了奥陶系油气成藏.Abstract: Based on the interpretation of 3D seismic sections, strike-slip faults were widely developed in Xianbazha area besides thrust faults. The faults appeared in different layers and overlapped in the space. The evolution of the faults experienced three stages including the middle Caledonian, the late Hercynian and the Himalayan. The faults played an important controlling role in oil and gas accumulation. The small thrust faults in the middle Caledonian were conducive to karst reservoirs as passageways of meteoric fresh water, and the strike-slip faults in the late Hercynian were favorable to reservoir reconstruction for deep thermal fluid. The Xianbazha fault controlled the development of trap in the upper Paleozoic. The strike-slip faults were favorable to oil and gas aggregation in the upper Paleozoic and restricted oil and gas accumulation in the Ordovician as vertical migration pathways.
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