银川平原基于地球物理资料三维建模的深部地质构造研究

doi:10.11720/wtyht.2020.1301

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Abstract

The geological structure of Yinchuan Plain is a Cenozoic fault basin, which belongs to the western marginal zone of Ordos block, and is sandwiched between the Helanshan uplift belt and the Taole-Hengshanbao thrust belt. It is also subjected to the east-west tensile stress of the Ordos block and the northeastward compression stress of the Alxa micro-continent, which forms complex geological structural features of this area. As an important part of the Tibetan block, the Ordos block and the Alxa block, and the important component of the north-south seismic belt, the Yinchuan fault basin has become one of the more active boundary structures in China’s mainland, and had many strong earthquakes in history. In order to interpret the deep geological structure of the Yinchuan fault basin, the authors employed 1∶200,000 regional gravity data, drilling data, seismic section, and magnetotelluric profile data as constraints to perform 2.5D human-computer interaction inversion in Yinchuan Plain. Based on this result, a deep 3D geological model of the Yinchuan Plain was constructed, which laid a solid foundation for regional stability evaluation, exploration and development of geothermal resources.

Key words： Yinchuan Plain deep geological structure 2.5D human-computer interaction inversion 3D geological model regional stability evaluation geothermal resource exploration

Received: 03 June 2019 Published: 22 April 2020

P631

Corresponding Authors: Xin-Jun HU E-mail: junyan_home@126.com

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	Xiao-Jing CHEN
	Xin-Jun HU
	Ning-Sheng LI
	Bai-Zhou AN
	Ya-Dong BAI

Cite this article:

Xiao-Jing CHEN,Xin-Jun HU,Ning-Sheng LI, et al. Research on the deep geological structure in Yinchuan Plain: 3D modeling based on geophysical data[J]. Geophysical and Geochemical Exploration, 2020, 44(2): 245-253.

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https://www.wutanyuhuatan.com/EN/10.11720/wtyht.2020.1301 OR https://www.wutanyuhuatan.com/EN/Y2020/V44/I2/245

Geological structure map of Yinchuan Plain
1—Upper Aeolian deposits of Holocene;2—Lacustrine deposits of Holocene;3—Lower Aeolian deposits of Holocene;4—Lingwu formation of Holocene;5—Malan formation of Upper Pleistocene;6—The tunnel ditch formation of Upper Pleistocene;7—Diluvium layer of Upper Pleistocene;8—Ganhegou formation of Neogene;9—Zhangenbao formation of Neogene;10—Qingshuiying formation of Paleogene;11—Yijun formation of Lower Cretaceous;12—Miaoshanhu formation of Lower Cretaceous;13—Zhiluo Formation of Middle Jurassic;14—Yan'an formation of Middle Jurassic;15—Shangtian formation of Upper Triassic;16—Dafengou formation of Upper Triassic;17—Ermaying formation Middle Triassic;18—Liujiagou and shanghegou coalbed of Lower Triassic;19—Liujiagou formation of Lower Triassic;20—Liujiagou formation of Lower Triassic;21—Upper Shihezi formation of Middle Upper Permian;22—Lower Shihezi formation of Middle Permian;23—Shanxi formation of Lower Permian;24—Yanghugou formation of Upper Carboniferous;25—Jingyuan formation of Upper Carboniferous;26—Zhongning formation of Upper Devonian;27—Miboshan formation of Middle Upper Ordovician;28—Tianjingshan formation of Lower Middle Ordovician;29—Hulustai formation of Middle Cambrian;30—Taosigou formation of Middle Cambrian;31—Wangquankou formation of Middle Proterozoic;32—Huangqikou formation of Middle Proterozoic;33—Zhaochigou group of Ancient Proterozoic;34—Zongbieli Rock group of Paleoproterozoic;35—Binbulite formation of Paleoproterozoic;36—Tonalite of Paleoproterozoic;37—Biotite granite of Paleoproterozoic;38—Geological boundary;39—Inferred geological boundary;40—Unconformity boundary;41—Lithofacies boundary;42—Important fault;43—Concealed fault;44—Active fault

Statistical table of stratigraphic density characteristics in Yinchuan Plain

Statistical table of quaternary cover layer density characteristics in Yinchuan Plain

2.5D human-computer interaction inversion profile location map of Yinchuan Basin

2.5 D inversion process diagram of V-V' profile
a—G-G’ magnetotelluric sounding profile;b—YC-1 deep seismic refkection profile;c—2.5D inversion process diagram of V-V' profile;ρ—formation density;Q—Quaternary;N—Neogene;E—Paleogene;K—Cretaceous;T—Triassic;P—Permian;C—Carboniferous;O—Ordovician;Pt—Paleoproterozoic

2.5D inversion results of the northern section in Yinchuan Basin
a—2.5D inversion process diagram of Ⅱ-Ⅱ' profile;b—2.5D inversion process diagram of Ⅲ-Ⅲ' profile;ρ—formation density;Q—Quaternary;N—Neogene;E—Paleogene;K—Cretaceous;T—Triassic;P—Permian;C—Carboniferous;O—Ordovician;Pt—Paleoproterozoic

2.5D inversion results of the central section in Yinchuan Basin
a—2.5D inversion process diagram of Ⅵ-Ⅵ’ profile;b—2.5 D inversion process diagram of Ⅶ-Ⅶ’ profile;ρ—formation density;Q—Quaternary;N—Neogene;E—Paleogene;K—Cretaceous;P—Permian;C—Carboniferous;O—Ordovician;Pt—Paleoproterozoic;γδo—Tonalite

2.5D inversion results of the southern section in Yinchuan Basin
a—2.5D inversion process diagram of Ⅷ-Ⅷ’ profile;b—2.5 D inversion process diagram of Ⅸ-Ⅸ’ profile;ρ—formation density;Q—Quaternary;N—Neogene;E—Paleogene;K—Cretaceous;T—Triassic;P—Permian;C—Carboniferous;O—Ordovician;Pt—Paleoproterozoic

Three-dimensional map of faults in the Yinchuan fault Basin

Sub-structural unit division map of Yinchuan fault Basin
The stratum is the bottom of Neogene

Three-dimensional map of the western slope area of Yinchuan fault Basin
Yellow is the bottom of Neogene, orange is the bottom of Paleogene, and green is the bottom of Ordovician

Three-dimensional map of the central depression area of Yinchuan fault Basin

Stereogram of the eastern slope area of Yinchuan fault Basin

Stereogram of the southern slope area of Yinchuan fault Basin

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