辽河坳陷东部凹陷构造演化及与油气关系探讨

On the Relations between Structural Evolution and Oil and Gas Accumulation in the Eastern Sag of Liaohe Depression

沉积盆地的构造特征和演化历史对含油气系统的形成、演化和油气藏的展布起着最基本的决定性作用。从裂陷中心演化史分析入手,阐述了东部凹陷构造演化和油气平面和纵向分布的关系。断裂发育史的差异性造成了东部凹陷与辽河陆上其它两个凹陷在资源潜力上的显著差异;油气富集层位受控于裂陷中心的迁移。从沙三期至东营组裂陷中心由凹陷中部向南北两侧迁移,油气富集层位上表现为沙三期中部油气最为富集,沙一期至东营组油气富集区移向南北部;构造演化还明显控制了火山岩油气藏的形成,据此对西部凹陷火山岩成藏预测,收到了理想的效果。

The structure features and evolution history of the sedimentary basin play a decisive role in the process of the generation and evolution of oil and gas bearing systems as well as the distribution of oil and gas reservoirs. Based on the analysis on the evolution history of the rifting center, the relation was illustrated between the structure evolution and oil and gas lateral and vertical distributions in the Eastern Sag. The distinctive faulting evolution history between Eastern Sag and the other two sags in Liaohe Continental Area leads to the significant difference of hydrocarbon resource amount between them. The oil and gas accumulation zones are controlled by the migration of the rifting center. From Es3 to Dong Ying Formation period, the rifting center shifts towards southern and northern sides from the central part in the Depression, which is manifested in the richest oil and gas accumulation in the central part during Es3 period, and during Es1 to Dongying Formation period, oil and gas accumulation area shifts southwards and northwards. In addition, it is also found that volcanic rocks are associated with oil and gas.