岩性油气藏 ›› 2016, Vol. 28 ›› Issue (3): 34–41.doi: 10.3969/j.issn.1673-8926.2016.03.006

• 油气地质 • 上一篇    下一篇

隆后坳陷区三角洲沉积特征及演化模式—— — 以桑塔木地区为例

唐 武1,王英民2,仲米虹3   

  1.  1. 中海油研究总院,北京 100028 ; 2. 浙江大学 海洋学院,杭州 310023 ;3. 中海石油气电集团有限责任公司技术研发中心,北京 100028
  • 出版日期:2016-05-20 发布日期:2016-05-20
  • 第一作者:唐武( 1987- ),男,博士,工程师,主要从事沉积学、层序地层学及储层预测等方面研究工作。 地址:( 100028 )北京市朝阳区太阳宫南街 6号海油大厦 A 座 1110 室。 E-mail : tw_geology@163.com
  • 基金资助:

    国家重大油气专项“前陆盆地油气成藏规律、关键技术及目标评价”(编号: 2011ZX05003 )资助

Sedimentary characteristics and evolution model of delta in backbulge zone:A case study in Sangtamu area

Tang Wu1, Wang Yingmin2, Zhong Mihong3   

  1.  1. CNOOC Research Institute , Beijing 100028 , China ; 2. Ocean College , Zhejiang University , Hangzhou 310023 , China ;3. Research and Development Center , CNOOC Gas and Power Group , Beijing 100028 , China
  • Online:2016-05-20 Published:2016-05-20

摘要:

三叠纪时期,塔里木盆地进入前陆盆地演化阶段,发育前陆坳陷、前缘隆起及隆后坳陷 3 个典型的前陆盆地构造单元。 为了探讨隆后坳陷区三角洲沉积特征,以桑塔木地区为例,利用岩心、钻井、测井、分析化验及三维地震等资料,采用“点-线-面”相结合的方法系统研究其三叠系克拉玛依组沉积特征。 结果表明,研究区发育辫状河三角洲和曲流河三角洲两大沉积体系,并且垂向上具有辫状河三角洲向曲流河三角洲演化的特征。 辫状河三角洲平原以分流河道沉积为主,辫状河三角洲前缘以水下分流河道沉积为主,而河口坝与远砂坝发育规模均较小;曲流河三角洲平原发育分流河道、天然堤及沼泽等,曲流河三角洲前缘则以水下分流河道和河口坝沉积为主。 克拉玛依组三角洲的演化不仅受控于前陆盆地构造运动所导致的地形坡度的变化,而且气候由干旱—半干旱向湿润的转化也起到一定作用。 在对 2 类三角洲沉积特征及成因分析的基础上,建立隆后坳陷区三角洲的沉积演化模式。

关键词: 扇三角洲, 砂砾岩, 百口泉组, 玛北斜坡区, 准噶尔盆地

Abstract:

 Tarim Basin entered into foreland basin evolution stage during Triassic period, forming three typical tectonic units (foredeep, forebulge, and backbulge). In order to discuss the sedimentary characteristics of deltas in the backbulge zone, based on the comprehensive analyses of cores, logging, analysis assay as well as 3D seismic data, the sedimentary characteristics of Triassic Karamay Formation in Sangtamu area were analyzed. The results show that two types of deltas were developed in the study area, namely braided river delta and meandering river delta, and it changed from the former to the latter vertically. The underlying braided river delta is mainly consisted of coarse sandstone, with well lateral continuity and large thickness, while the overlying meandering river delta is exact opposite. Both deltas mainly developed plain and front subfacies. The plain subfacies of braided river delta is primarily composed of distributary channel, while the subaqueous distributary channel microfacies composes the main part of front subfacies, with mouth bar and distal bar locally developed. The distributary channel, levee and swamp microfacies can be identified in meandering river delta plain subfacies, and its front subfacies is chiefly consisted of subaqueous distributary channel and mouth bar. The delta pattern transformation in the study area is controlled by topographic slope change caused by tectonic activities of foreland basin. The paleoclimate changed from arid-semiarid to humid also played an important role. Finally, based on the origin analysis of deltas, the evolution models of delta in backbulge zone were built.

Key words: fan delta, glutenite, Baikouquan Formation, Mabei slope, Jungger Basin

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