石油勘探与开发 >

2021 , Vol. 48 >Issue 1: 118 - 126

DOI: https://doi.org/10.11698/PED.2021.01.10

油气勘探

南大西洋中段盆地盐构造发育特征及其影响因素模拟

  • 余一欣 ,
  • 陶崇智 ,
  • 史帅雨 ,
  • 殷进垠 ,
  • 邬长武 ,
  • 刘静静
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  • 1.中国石油大学（北京）油气资源与探测国家重点实验室,北京 102249;
    2.中国石油大学（北京）地球科学学院,北京 102249;
    3.中国石化石油勘探开发研究院, 北京 100083
余一欣（1977-）,男,江西婺源人,博士,中国石油大学（北京）副教授,主要从事盆地分析和构造地质研究工作。地址：北京市昌平区,中国石油大学（北京）盆地与油藏研究中心,邮政编码：102249。E-mail：yuxin0707@163.com

收稿日期: 2020-06-29

  修回日期: 2021-01-06

  网络出版日期: 2021-01-19

基金资助

国家科技重大专项（2016ZX05033,2016ZX05026-007）; 国家自然科学基金项目（42072149）

收起

Physical modeling of salt structures in the middle south Atlantic marginal basins and their controlling factors

  • YU Yixin ,
  • TAO Chongzhi ,
  • SHI Shuaiyu ,
  • YIN Jinyin ,
  • WU Changwu ,
  • LIU Jingjing
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  • 1. State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum, Beijing 102249, China;
    2. Basin and Reservoir Research Center, China University of Petroleum, Beijing 102249, China;
    3. Research Institute of Petroleum Exploration and Development, Sinopec, Beijing 100083, China

Received date: 2020-06-29

  Revised date: 2021-01-06

  Online published: 2021-01-19

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摘要

通过对比分析南大西洋中段两岸盆地下白垩统阿普特阶盐构造发育特征及其差异性,利用构造物理模拟实验方法,探讨盐下斜坡倾斜程度、盐下隆坳结构以及板块抬升作用等因素对盐构造发育的影响。模拟结果表明,西非中段盆地盐下斜坡较陡,有利于盐岩向海洋方向发生快速流动,形成的盐底辟规模较大,但数量较少。巴西桑托斯盆地和坎波斯盆地的外部基底隆起远离物源区,其上方有利于盐岩侵入聚集而明显增厚;而西非中段盆地的基底隆起靠近盆地边缘,隆起上方残留盐层较薄,两侧发育规模较小的盐滚构造。非洲板块的抬升作用有利于西非中段盆地盐底辟充分发育,并在前缘挤压区形成规模较大的逆冲断层和褶皱。图8表1参44

关键词： 南大西洋; 被动大陆边缘; 下白垩统; 盐构造; 盐下地层结构; 物理模拟实验

本文引用格式

余一欣 , 陶崇智 , 史帅雨 , 殷进垠 , 邬长武 , 刘静静 . 南大西洋中段盆地盐构造发育特征及其影响因素模拟[J]. 石油勘探与开发, 2021 , 48(1) : 118 -126 . DOI: 10.11698/PED.2021.01.10

Abstract

With many types of salt structures developed in the Lower Cretaceous Aptian Formation, the passive continental marginal basins in the middle segment of the south Atlantic are hot areas of deep-water petroleum exploration. Based on analysis of differential deformations of salt structures, the influences of the inclination of subsalt slope, subsalt topographic reliefs and basement uplifting on the formation of salt structures were analyzed by physical modeling in this work. The experimental results show that the subsalt slopes in the middle West Africa basins are steeper, so the salt rock is likely to rapidly flow towards the ocean to form larger and fewer salt diapirs. In the Santos and Campos basins, the basement uplifts outside the basins are far from the provenances, which is conducive to the intrusion and accumulation of salt rock on the top of the basement uplifts. In contrast, in the middle West Africa, the basement uplifts are close to the basin margin, the residual salt layers above them are thin, and small triangular salt structures develop on both sides of the uplifts. Moreover, the uplifting of the African plate is also conducive to the full development of salt diapirs in the middle West Africa and results in large-scale thrust faults and folds in the front compressional zone.

Key words： South Atlantic; passive continental margin; Lower Cretacous; salt structure; subsalt framework; physical modeling

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