巴楚-麦盖提地区油气动态成藏的运移通道

巴楚-麦盖提地区油气运移输导网络由断裂、不整合面、储层孔、洞、缝系统组成;通过对断裂封堵和开启性进行分析,烃类沿断裂面作s形路径运移;八期主要不整合面中T60和T55不整合面在全区为开启,T70和T54不整合面在巴楚隆起南界断裂构造带为开启.在海西和喜马拉雅两大成烃期中,该区具多期动态成藏的特点,主运移通道也存在时空上的差别:加里东中期-海西晚期之前不整合面、下寒武统白云岩孔、洞、缝系统为主通道;海西晚期-喜马拉雅期,断裂的多期活动促使早期古油气藏调整和喜马拉雅期生成的油气聚集,不整合面和断裂通道占主导,巴楚隆起西段边界断裂带为喜马拉雅晚期油气聚集调整分配区.

Migration pathway of hydrocarbon dynamic accumulation in Bachu-Markit area, Xinjiang, China

The hydrocarbon migration path system in the Bachu-Markit area consists of fault, (unconformity) surface as well as vugs, fissures and pores in reservoirs. According to the fault sealing (studies), the hydrocarbon is thought to migrate in "S" ways along fault surface; Among the 8 major (unconformities), the T_6~0, T_5~5 unconformity surfaces are open in the whole area, and the T_7~0 and T_5~4 (unconformity) surfaces are open in the southern structural belt of the Bachu uplift. During the Hercynian-Himalayan periods, this area had the characteristic of multiperiodic accumulations. The main pathways are different in space and tempo. The unconformity and the pore-vug-fissure system in the Lower Cambrian dolomite, which formed before the middle Caledonian-late Hercynian, are the main pathways; however, during the late Hercynian-Himalayan periods, the multiperiodic fault tectonic movements made the (paleoreservoirs) adjusted and hydrocarbon, which just came into being in Himalayan period, accumulated. The unconformity surfaces and faults are the main pathways. The boundary fault belts in the west of the Bachu uplift are the hydrocarbon accumulation and allocation areas in the late Himalayan period.