石油与天然气地质 ›› 1998, Vol. 19 ›› Issue (2): 110-115.doi: 10.11743/ogg19980205

• 论文 • 上一篇    下一篇

塔里木东南断陷区侏罗系沉积体系及油气意义

李文厚   

  1. 西北大学地质系, 陕西西安710069
  • 收稿日期:1998-02-11 出版日期:1998-06-25 发布日期:2012-01-18

JURASSIC SEDIMENTARY SYSTEM OF FAULT DEPRESSION IN SOUTHEAST TARIM AND ITS HYDROCARBON SIGNIFICANCE

Li Wenhou   

  1. Department of Geology, Northwest University, Xi’an, Shaanxi
  • Received:1998-02-11 Online:1998-06-25 Published:2012-01-18

PDF (PC)

929

被引次数

16

摘要：

冲积扇、辫状河、扇三角洲和辫状河三角洲体系,构成了塔里木东南断陷区侏罗系最主要的粗粒碎屑沉积体系,它们以短轴方向搬运-沉积为主。盆地不对称双断导致沉降中心和沉积中心偏向于主断裂一侧,冲积扇-扇三角洲体系发育于断陷盆地的陡坡,辫状河-辫状河三角洲体系在缓坡一侧发育。侏罗系含油砂岩的主力油源属于浅海相成油母质,来自下伏古生界。辫状河河道砂坝、辫状河三角洲前缘水下分流河道和扇三角洲前缘水下分流河道是主要的储集砂体

关键词: 沉积体系, 环境演化, 油气意义, 侏罗系, 塔东南

Abstract:

Fan,braided stream,fan delta and braided delta sysem constitute the primary Jurassic coarse clastic sedimentary system.The system is characterised mainly by short axial directional transportation deposition in the fault depression of the Southeast Tarim Basin.The asymmetrical bilateral fractures within the graben resulted in the drift of subsidence center and depocenter towards the main fracture.Fan fan delta system developed on the abrupt of the fault depression,and braided stream braided delta sysem developed on the gentle slope.Dark mudstone of semi deep lake facises is good hydrocarbon source rock.The major petroleum source in the Jurassic oil bearing sandstone should be attributed to shallow marine source rocks derived from underlying Paleozoic.The stream channel bar,the underwater distributary channel of fan delta front and braid delta front are major reservoir sandtone bodies.