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柴达木盆地西部地区断裂构造与油气聚集
方向 江波 张永庶
摘 要:柴达木盆地西部地区油气藏常与断裂构造相伴生.柴西地区南部沿断裂带分布有砂西-尕斯-油砂山油气聚集带、跃进2号-跃东油气聚集带、乌南-绿草滩油气聚集带;西部阿尔金山前带沿柴西等断裂分布有断鼻构造控制的构造-地层-岩性复合型油气藏;北部沿着英北断裂、南翼山断裂、尖顶山断裂分布有油泉子、开特米立特、南翼山、尖顶山等构造-裂缝型油气藏.柴西地区断裂的形成与阿尔金山和昆仑山在中新生代的剧烈挤压和走滑活动有关.断裂以逆断层和走滑断层为主,还有少量的同沉积正断层、滑脱断层、反转断层等.断裂主要发育北东向、北西向和近南北向,平面上呈平行状,斜列状、斜交状、正交状,反"S"形,透镜状、发散状等组合类型,剖面组合型式主要有叠瓦状、冲断式、花式3种主要类型.其中,以冲断型及正交状、斜交状断层组合形成的构造油气藏最为发育.断裂不仅控制了生烃凹陷的展布及构造圈闭的形成,在一定程度上也控制了河流三角洲、扇三角洲有利储集相带的展布.断裂活动形成的大量裂缝,改善了储层的物性条件.柴西南区普遍存在以断裂为油气运移通道形成的侧接式上生下储式油藏.
关键词:油气保存;生烃凹陷;断裂组合;柴达木盆地西部
分类号:TE111.2 文献标识码:A
文章编号:0253-9985(2006)01-0056-06
Faulted structure and hydrocarbon accumulation in western Qaidam basin
Fang Xiang Jiang Bo Zhang Yongshu
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方向(1970-),男,高级工程师,石油地质
作者单位:方向(中国石油,勘探开发研究院,北京,100083)
江波(中国石油,青海油田,勘探开发研究院,甘肃,敦煌,736202)
张永庶(中国石油,青海油田,勘探开发研究院,甘肃,敦煌,736202)
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