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库车坳陷古近系库姆格列木组高精度层序地层分析及其油气勘探意义
Keywords: 高精度层序地层 ,沉积体系 ,储层 ,库姆格列木组 ,库车坳陷
Abstract:
库车坳陷古近系库姆格列木组是盆地内重要的含油气层段。本文应用高精度层序地层学的理论和方法，在库车坳陷古近系库姆格列木组地层中划分出3个三级层序、14个四级层序和数十个五级层序(准层序)。四级层序中发育有冲积扇、辫状河、曲流河、辫状河三角洲和滨浅湖等沉积体系，局部地区发育下切水道、干旱盐湖、泻湖—海湾、半深湖、浊流—重力流等沉积。该组下部四级层序：Psk1、Psk5和中上部四级层序Psk7、Psk12等的砂质沉积形成区内的主力储层，主要分布在盆地北—西北缘和东—东南缘，与其上覆的泥岩、膏泥岩形成有利的储盖组合。
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