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Lin LIU, Huichao RUI. EXPLORATION ON STRUCTURAL CHARACTERISTICS OF THE WEIHE BASIN AND ITS EVOLUTION[J]. Journal of Geomechanics, 2018, 24(1): 60-69. doi: 10.12090/j.issn.1006-6616.2018.24.01.007
Citation: Lin LIU, Huichao RUI. EXPLORATION ON STRUCTURAL CHARACTERISTICS OF THE WEIHE BASIN AND ITS EVOLUTION[J]. Journal of Geomechanics, 2018, 24(1): 60-69. doi: 10.12090/j.issn.1006-6616.2018.24.01.007
shu

EXPLORATION ON STRUCTURAL CHARACTERISTICS OF THE WEIHE BASIN AND ITS EVOLUTION

  • 1.

    School of Earth Sciences and Resources, China University of Geosciences, Beijing 100083, China

  • 2.

    Shaanxi Geological & Mineral Survey Group Co. Ltd, Xi'an 710054, Shaanxi, China

  • 3.

    Key Laboratory of exploration and comprehensive utilization of mineral resources, Xi'an 710054, Shaanxi, China

  • 4.

    School of Earth Science and Resources, Chang'an University, Xi'an 710064, Shaanxi, China

Received Date:  23 June 2016
Revised Date:  29 October 2017
    Abstract
  • The Weihe basin is the graben basin located between the Qinling orogenic belt and the Ordos basin, and there are some controversies about the formation time and basement constitutions of the Weihe basin. In recent years, natural gas types, formation mechanism, accumulation condition, resources potentiality and basin structure in the Weihe basin have been well studied, which provides considerable evidences to resolve the controversies mentioned above. According to the drilling data and the new results of geophysical and geochemical prospecting in the Weihe basin, we found that the Weihe basin covered by Cenozoic, Mesozoic-Palaeozoic complex cap rocks, and composed of two depressions, one nose structure, two bulges and two slope belts, which respectively are Gucheng depression, Xi'an depression, Jinghe nose structural, Baoji bulge, Lishan bulge, Xianyang slope belt and Fuping-Pucheng slope belt. Baoji bulge in the west, Xi'an depression and Xianyang slope belt in the central section are covered by Paleozoic strata and Mesozoic strata, respectively. The basement of Fuping-Pucheng slope belt in the northeast and Gucheng depression in the northwest are composed of Ordovician strata and Paleozoic strata, respectively. The Weihe basin and the Ordos basin display similar basement and overlying strata. The formation of Taiyao fault (ca. 1800 Ma) provides the structural condition, and the formation of syngenetic thrust faults in Weibei uplift during Caledonian movement at the end of the Ordovician marks the beginning of independent evolution of the Weihe basin. After that, Mesozoic and Cenozoic are the main sedimentation period of the basin. Combined with previous studies, basement model and evolution model of the Weihe basin are built in this article.
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