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TERTIARY SALT PILLOW STRUCTURES IN THE CENTRAL SECTOR OF THE KUQA FORELAND FOLD-AND-THRUST BELT,TARIM BASIN, NORTHWEST CHINA
Author(s): 
Pages: 281-290
Year: Issue:  3
Journal: CHINESE JOURNAL OF GEOLOGY

Keyword:  盐枕构造重力作用塑性流动库车前陆褶皱冲断带塔里木盆地;
Abstract: 本文旨在探讨库车前陆褶皱冲断带盐枕构造的类型、分布、成因机制及其与油气聚集的关系.通过地震反射剖面的解释和石油地质条件综合分析,认为库车前陆褶皱冲断带由北而南依次发育残留盐枕、非稳态盐枕和稳态盐枕等3类盐枕构造,沿克拉苏构造带和西秋立塔克构造带呈长条形带状分布,其成因受重力滑动、重力扩展、区域挤压和塑性流动作用的联合控制.从盐枕构造的演化序列和分布特征看,该区盐枕构造的主要特点表现为:北部盐枕形成较早,稳定性差,出现残留盐枕,盐枕规模较小;南部盐枕形成较晚,稳定性较强,形态相对完整,规模较大.库车前陆褶皱冲断带盐枕构造与油气聚集密切相关,伴随盐枕构造的形成,发育大量盐相关油气圈闭构造,沿盐枕构造成带状分布,同时盐枕构造巨厚的盐岩层为油气聚集提供了良好的封闭条件.
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