太阳岛—葵花岛构造带油气成藏模式及勘探潜力

受背斜、断层、沉积旋回和沉积相等因素的控制,太阳岛—葵花岛构造带自下而上发育沙河街组一段,东营组一、二、三段4套含油层系。油气藏的纵向分布具有上、下发育气层,中部发育油气层的规律,即东营组二段中上部以气藏为主,东营组二段下部、三段中上部为油气藏,东营组三段下部发育厚度较大的纯气藏。根据有机质演化史与断裂活动、圈闭形成和油气运移的配置研究,显示研究区曾发生3期成藏,即早期成藏——沙一末期、中期成藏——东营末期、晚期成藏——馆陶组—明化镇期。油气多期成藏和差异运聚决定了研究区在纵向上不同层系和平面上不同区带都有较大的勘探潜力,经研究共确定了太阳岛构造、葵花岛构造、葵东断鼻、葵北断鼻等多个有利圈闭。

Forming Pattern of Oil-Gas Reservoirs and Exploration Potential in Taiyangdao-Kuihuadao Structure Belt

Controlled by the factors including anticline, fault, sedimentary cycle and sedimentary facies, four oil-bearing horizons series of the 1st member of Shahejie Formation, the 1st, 2nd and 3rd members of Dongying Formation developed in Taiyangdao -Kuihuadao structural belt from bottom to top. Vertically, oil-gas reservoirs are characterized by the gas-bearing layers developed in the top and the bottom, and oil formation developed in the middle part, that is to say, gas reservoir mainly formed in the middle-upper part of the 2nd member of Dongying Formation, oil-gas reservoir mainly formed in the lowerp art of the 2nd member of Dongying Formation, the thicker pure gas reservoir developed in the 3rd member of Dongying Formation. Based on the study of organic evolution history and the configuration of faulting movement, trap forming and oil-gas migration, the result shows that three stages of reservoir forming had occurred in the study area, namely, early stage of reservoir forming occurred in the end of the 1st member of Shahejie Formation deposition, medium stage of reservoir forming occurred in the end of Dongying Formation deposition, the late stage of reservoir forming occurred during a period from Guantao Formation to Minghuazhen Formation. This area stillh as a relatively big potentiality both vertically and horizontally, which result from them ulti-stage reservoir-forming and differential migrating and accumulating. Several promising traps such asT aiyangdao structure, Kuihuadao structure, faulted nose in the eastern Kuihuadao, and faulted nose in the western Kuihuadao, are determined through study.