曲堤断鼻应力成因机制及对构造和油气的控制作用

发布时间：2018-06-23 15:09

本文选题：曲堤 + 断鼻　；参考：《地质科技情报》2017年03期

【摘要】：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。
[Abstract]:Qudike fault nose is a large middle and shallow oil-rich fault nose structure in Jiyang depression, which is formed by the combination of tension, torsion and arch stress. Since Paleogene, NW tensile stress and NE direction dextral strike-slip torsional stress have resulted in the formation of a "two order, two barrier and one graben" tectonic pattern with NE strike on the background of the base nose. The differential arch extension of the superimposed basement blocks since the late Paleogene resulted in the formation of NW-trending "nasal ridge belt". Different stress mechanisms have different controlling effects on oil and gas. Under the action of tensile stress, fault activity is weak but oil and gas abundance is high in the main fault area of the fault nose, and the fault activity is strong but the hydrocarbon abundance is low in the east and west flanks, and oil and gas are enriched near the compression and torsion section of the fault under the action of torsional stress. The oil content in the vicinity of the tensional and torsional section is poor, and the arched stress causes the oil and gas to be greatly dredged vertically, thus forming a series of new fault block traps and forming the most favorable oil accumulation site in the "nasal ridge". Different structural parts in the fault nose form different structural units and have different oil and gas abundance due to the different stress action. About 95% of the proven reserves are located in the "two barriers and one cut" fault nose main area formed by the tensional and torsional formation, and about 95% of the proven reserves are located in the main body of the fault nose. Nearly 60% of the proven reserves are concentrated in the "nasal ridge" of the upper arch of the basement, indicating that the high structure is the main factor of oil control.
【作者单位】：中国石化胜利油田鲁明油气勘探开发有限公司;中国地质大学(武汉);中国石油大学(华东);
【分类号】：P618.130.2

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