巴楚-麦盖提地区油气成藏的输导系统

PATHWAY SYSTEM OF OIL AND GAS MIGRATION IN BACHU-MAIGAITI AREA

巴楚 -麦盖提地区油气运移通道以断裂、不整合面、储层孔、洞、缝为主 ,且相互联通构成输导网络 ;在 8期主要不整合中 ,T06,T55不整合面在全区为开启 ,T07,T45不整合面在巴楚隆起南界断裂构造带为开启 ;由于多期构造活动 ,断裂、孔、洞、缝均为有效开启 ,为有效油气运移通道。根据油气动态成藏原理分析 ,加里东晚期 -海西早期 ,主通道为下寒武统白云岩孔、洞、缝系统 ,且分布于阿瓦提凹陷巴楚隆起东北部地区 ;海西晚期 -末期 ,巴楚隆起东北部边界断裂、T06不整合面和下寒武统孔、洞、缝系统为主通道 ;喜山期 ,主通道为T06,T55,T45不整合面、巴楚隆起南界断裂带 ,且主要分布于麦盖提斜坡巴楚隆起南界地区。

The pathways of oil and gas migration in Bachu-Maigaiti areas might consist mainly of faults, unconformity surfaces,as well as vugs,fissures and pores in reservoirs,which might have been connected with each other and constitute the delivery network of oil and gas.Among the 8 major unconformities, the T0 6 and T5 5 unconformity surfaces have been open in the whole area,the T0 7 and T4 5 unconformity surfaces have been open in the southern structural belt of Bachu uplift.Multiple tectonic movements have resulted in the opening of faults, pores,vugs and fissures,and became effective migration pathways of oil & gas.According to the dynamic theory of hydrocarbon migration and accumulation in late Caledonian-early Hercynian,the major pathway would be the pore-vug-fissure system in lower Cambrian dolomite that occurred in Awati sag and northeastern area of Bachu uplift; in late to last stage of Hercynian,the major pathway would include the boundary faults in the northeastern of Bachu uplift, T0 6 unconformity surface and pore-vug-fissure system in lower Cambrian;in Himalayan period, the major pathway would be the T0 6,T5 5 and T4 5 unconformity surfaces and the fault belt on the southern boundary of Bachu uplift that occurred mainly in the area including the Maigaiti slope and southern boundary of Bachu uplift.