论文部分内容阅读
在西部复杂叠合盆地中,油气藏形成后的调整改造现象非常普遍。通过对塔中地区调整改造事件的分析,认为塔中地区经历了3～4期调整改造,分别为:奥陶纪、志留纪的破坏性改造、印支—燕山期的调整性改造、喜马拉雅期的建设性改造。在塔中地区的具体表现形式为断层的局部活动和圈闭的局部迁移。调整改造对塔中地区油气藏的影响主要表现在3个方面:(1)导致了多种相态油气并存;(2)导致了油气的再分配;(3)导致了油气藏的现今分布格局。目前塔中地区发现的油气藏大部分是从下伏地层调整上来的次生油气藏,在后期构造调整较弱的塔中10号带、塔中I号坡折带西部地区下伏奥陶系、寒武系有良好的勘探潜力。
In the complex western superimposed basins, the phenomenon of adjustment and reconstruction after the formation of oil and gas reservoirs is very common. Based on the analysis of the adjustment and reconstruction events in Tazhong area, it is believed that the Tazhong area experienced three to four adjustments and alterations, namely the destructive transformation of Ordovician and Silurian, the adjustment of Indo-Yanshan period, Period of constructive transformation. The specific manifestations in the Tazhong area are local faults and partial migration of traps. The effects of adjustment and reformation on the reservoirs in the Tazhong area are mainly manifested in three aspects: (1) leading to the coexistence of multiple phases of oil and gas; (2) resulting in the redistribution of oil and gas; (3) leading to the present distribution pattern of oil and gas reservoirs . At present, most of the oil and gas reservoirs discovered in Tazhong area are secondary oil and gas reservoirs adjusted from the underlying strata. In the late Tazhong 10 zone, the Ordovician series Cambrian has good exploration potential.