孔雀河地区志留系成藏条件及主控因素分析

The Reservoir-Forming Conditions and Key Factors in Silurian of Peafowl River Region

志留系砂岩是塔里木盆地重要的油气勘探层系之一,也是孔雀河地区有望获得油气突破的重要勘探目的层。分析认为:该区是一个在加里东中期构造运动基础上发展起来的古构造斜坡,长期处于油气运移聚集的有利指向区;寒武系—下奥陶统是孔雀河地区主力烃源岩,志留系存在有效的储盖组合,运聚系统良好;加里东期-海西早期为主要油气充注期,喜山期属于早期油藏晚期裂解。在成藏主控因素分析的基础上,提出了该区下一步勘探的方向。

The sand formations in Silurian is the important formations for oil-gas exploration in Tarim Basin. It is the most hopeful target zone of oil-gas exploration in peafowl river region. It is thought that this region is a ancient structural slope based on mid-caledonian tectogenesis which located in a favorable area of oil and gas accumulation. Major hydrocarbon source rocks lies in the Silurian and down ordovician. Combination of reservoir, cap and oil-gas migration in Silurian are advantageous to oil-gas accumulation. The most of oil and gas are injected in Caledonian and early Hercynian. In Himalayan tectogenesis oil accumulates before hydrocarbon splits. Next exploration of oil and gas in the region is directed on the base of analysis of key reservoir-forming factors.