柴达木盆地南八仙油气田构造及演化特征

The Structure and Evolution Characteristics of Nanbaxian Oil and Gas Field in Qaidam Basin

结合地层分布、沉积特征、不整合接触关系等地质因素对南八仙油气田构造及演化特征进行综合分析,认为南八仙油气田发育形成挤压冲断、水平走滑、扭动拉张等构造样式以及2套构造系统,经历路乐河组沉积前断陷、下干柴沟组沉积前断坳过渡、上干柴沟组沉积前坳陷、上下油砂山组沉积期后强烈褶皱回返等构造演化阶段,最终形成现今的断背斜构造格局。

This paper analyses structure and evolution characteristics of Nanbaxian oil and gas field based on stratigraphic distribution,depositional setting,unconformable contact relation,and so on. It pointed out that Nanbaxian oil and gas field developed compressed and thrusted,horizontal strike slip,writhe and tensional structure conformation and deep and low structure system and experienced 4 structural evolution stages of pre-depositional fault depression,pre-depositional fault sag overexploitation,pre-depositional depression and post-depositional folding,which formed blanking anticline ultimately.