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曲堤断鼻是济阳坳陷一个大型中浅层富油断鼻构造,受张、扭、拱应力复合作用形成。古近纪以来NW向拉张应力和NE向右旋走滑扭应力持续作用使其在基底鼻形背景上形成NE走向的“两阶两垒夹一堑”构造格局,古近纪晚期以来叠加的基底块体差异性拱张又使其形成NW向地垒型“鼻脊带”。不同应力机制对油气有不同控制作用,张应力作用下断鼻主体区断层活动弱但油气丰度高,东西两翼断层活动强但油气丰度低;扭应力作用下断层压扭段附近油气富集,张扭段附近含油性变差;拱张应力作用使油气作垂向大幅疏导从而形成系列新断块圈闭并形成“鼻脊区”最有利聚油场所。断鼻内不同构造部位因应力作用不同从而形成不同构造单元并具有不同含油气丰度特征,约95%已探明储量赋存于张扭形成的“两垒夹一堑”断鼻主体区内,其中近60%已探明储量又富集于基底上拱“鼻脊区”,显示构造高部位是控油的主要因素。 相似文献
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Phase—Controlled and Gas—Washing Fractionations During the Formation of Petroleum Reservoirs 总被引：1，自引：0，他引：1
By PVT fractionation experiments to model phase-controlled and gaw-washing fractionations during the formation of petroleum reservoirs,the authors measured the physical and chemical properties of products formed in different fractionation staes and made a correlative analysis of the influence of depressurization and gas washing on oil/gas molecular composition and the rule of fractionation.The analytical results showed that gas washing is an important factor affecting the physical properties of crude oils.and also can be regarded as a good genetic interpretation of marine wax-high oils in the Tarim region,Xinjiang,China.Phase-controlled and gaw-washing fractionations can lead to the formation of condensates and their differences in chemical composition from crude oils are a direct reflection of evaporating fractionation.Phasecontrolled and gaw-washing fractionations have a great influence on the composition of molecular compounds and relevant parameters.So phase-controlled and gas-washing fractionations during the formation of petroleum reservoirs are not only favorable to identifying different processes of formation of petroleum reservoirs,but also to the scientific application of routine geochemical parameters. 相似文献
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