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地质学报  2008 

柴达木盆地西南缘乌南油田新近系古地震纪录及储集性能研究

, PP. 805-812

Keywords: 震积岩,软沉积变形,储集物性,新近系,柴达木盆地

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Abstract:

柴达木盆地为一新生代以来形成的叠合盆地,由于多期构造活动,盆内形成了多组断裂系统。受新近纪昆仑山北侧断裂活动的影响,盆地西南缘乌南地区地震活动强烈,发育一系列与地震有关的震积岩,形成多种类型的与地震活动有关的软沉积物变形构造。乌南油田新近系的软沉积物变形构造主要包括重荷模、火焰构造、震积砂枕、砂球构造、假结核、枕状层、液化砂泥岩脉、泄水构造、层内错断、地裂缝、串珠状构造、微褶皱纹理等。本区震积岩的岩石类型主要包括震褶岩、震裂岩、震塌岩、自碎屑角砾岩等。地震活动使岩层产生大量的微裂缝,裂缝沟通了原有的孔隙。尽管储集层孔隙度没有大幅度增加,但能够极大地改善储集层渗透性,使渗透率大幅度增加。震积岩特别是震裂岩和震碎角砾岩是一种潜在的油气储层,为油气勘探和开发提供了新的视角和领域。

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