石油与天然气地质 ›› 1995, Vol. 16 ›› Issue (3): 216-221.doi: 10.11743/ogg19950303

• 论文 • 上一篇    下一篇

库车坳陷早三叠世三角洲相及伴生沉积

李维锋, 高振中, 彭德堂, 王正允   

  1. 江汉石油学院地质系, 湖北荆沙, 434102
  • 收稿日期:1995-03-31 修回日期:1995-05-08 出版日期:1995-09-25 发布日期:2012-01-16
  • 基金项目:

    国家“八五”科技攻关项目成果(85-101)

EARLY PERMIAN DELTAIC FACIES AND ITS ASSOCIATED SEDIMENTS IN KUQA DEPRESSION

Li Weifeng, Gao Zhenzhong, Peng Detang, Wang Zhengyun   

  1. Department of Geology, jianghan Petroleum institute, Jingsha, Hubei
  • Received:1995-03-31 Revised:1995-05-08 Online:1995-09-25 Published:2012-01-16

PDF (PC)

999

被引次数

12

摘要：

库车坳陷下三叠统为三角洲、湖泊沉积。北缘发育的扇三角洲和辫状河三角洲是本区主要的沉积相类型。扇三角洲沉积以突发的灾变事件产生的重力流与牵引流沉积共存为特点。前者以碎屑流成因的块状砾岩为主占主导地位,后者为扇面河道砂体,多呈透镜状分布于重力流沉积物中;辫状河三角洲沉积以正常牵引流尤以河道沉积为主,砂体呈层状,侧积交错层发育。二者自成体系却又相互联系,构成两个密切相关的演化阶段,受控于坳陆边缘断裂活动的强度和延续时间。

关键词: 扇三角洲, 辫状河三角洲, 沉积相, 下三叠统, 库车坳陷

Abstract:

Kuqa Depression is a "dustpan" shape depression with steep slope in the north side andgentle slope in the south side.Fan-deltas and braid river deltas are developed on its northmargin while shore deposit, shallow lake deposit and meandering river deltas are developedon the south margin. The fan-deltas are characterized by gravity flow deposit associated withtractive current deposit, Both of the deposits were resulted by sudden catastrophic event. Theformer is primarily massive conglomerate; the later is mainly lenticular channel sand bodiesdistributed within the gravity flow deposit, The normal tractive current deposit of the braidriver deltas is primarily bedded channel sand bodies in which lateral aggradation and crossbedding are well developed, The fan deltas and braid river deltas are independant but closelyconnected to each other,their evolution is controlled by the intensity and range of faulting activity in depression margins.