ISSN 1006-3021 CN11-3474/P
Published bimonthly started in 1979
中新生代柴达木叠合盆地解析、动力学机制探讨及对油气控制意义研究
  
关键词:Qaidam basin  Mesozoic to Cenozoic  tectonic layers  superimposition features  oil & gas distribution
基金项目:中国石油天然气股份有限公司重大专项“柴达木盆地油气勘探开发关键技术研究”(编号: 07-01Z-01-05)
作者单位E-mail
王桂宏 中国石油勘探开发研究院 wanggh@petrochina.com.cn 
周川闽 中国石油勘探开发研究院  
夏响华 中国地质调查局油气资源调查中心  
张永庶 中国石油青海油田分公司勘探开发研究院  
赵孟军 中国石油勘探开发研究院  
王点奥 澳洲国立大学地球科学学院  
吕杰堂 中国地质环境监测院  
王根久 中国石油勘探开发研究院  
张铭 中国石油勘探开发研究院  
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摘要:
Superposition Process and Dynamic Mechanism of Mesozoic–Cenozoic Qaidam Basin and Their Influence on Hydrocarbon Accumulations
      The characteristics of Qaidam basin in northern Tibetan Plateau have been long controversial. In this study, on the basis of profile interpretation and well data, the Mesozoic-Cenozoic is separated into three parts separated by base of Tertiary and unconformity T2’ which is the top of Xia Youshashan Formation (N1 2). Mesozoic is the lower tectonic layer, E-N1 2 is considered to be intermediate tectonic layer, and N2 2-Q is upper tectonic layer. This delimitation is different from previous study which set the unconformity of Q and N3 2 as the major boundary, or separated Mesozoic-Cenozoic into two parts rather than three parts as held in this paper. The delimitation of three parts illustrates three styles of basin development which controlled different petroleum systems. The lower tectonic layer of Mesozoic were developed in northern parts of Qaidam basin, and intermediate tectonic strata overlapped on it, which matured the Jurassic soil rocks in early Tertiary during the basin expansion and subsidence. The intermediate tectonic strata mainly developed over west part of Qaidam basin which might have undergone rotation of basement blocks with some minor faulted depressions formed. The upper tectonic layer developed under the control of boundary strike-slip faulting and basement flexure, and depocenters of N2 2, N3 2 and Q migrated eastward. Superimposition between intermediate and lower tectonic layer was controlled by inverted strike-slip of major basement faults while the superimposition feature of upper and intermediate tectonic layer seems to be basement flexural with depressions continuous developing. Multiphase inversions of major faults were controlled by tectonic setting and special structures at the depth of Qaidam basin, which may be the critical dynamic mechanism for inverted strike-slipped and continuous basement warping of basins superimposing. Significance of three tectonic layers for hydrocarbon exploration is also discussed in this paper.
WANG Gui-hong,ZHOU Chuan-min,XIA Xiang-hua,ZHANG Yong-shu,ZHAO Meng-jun,WANG Dian-ao,LÜ Jie-tang,WANG Gen-jiu,ZHANG Ming.2019.Superposition Process and Dynamic Mechanism of Mesozoic–Cenozoic Qaidam Basin and Their Influence on Hydrocarbon Accumulations[J].Acta Geoscientica Sinica,40(6):805-815.
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