银川盆地东缘上地壳电性结构特征及地热勘探方向

doi:10.11720/wtyht.2024.1489

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Abstract

The successful operation of geothermal wells on the eastern margin of the Yinchuan Basin suggests a new geothermal exploration orientation around the Huanghe fault and its secondary faults. To further investigate the controlling effect of the Huanghe fault on geothermal resources in the study area and pinpoint the exploration target, this study arranged four magnetotelluric (MT) lines, obtaining 71 survey points.The preprocessing and two-dimensional inversion of MT data yielded a two-dimensional electrical structure of the study area within a depth of 10 km.Based on the previous geological, gravity, microtremor, and controllable source audio magnetotellurics(CSAMT) data in the study area, this study further interpreted the strata and fault structures of the study area.It posited that the relatively-low-resistivity zone within the high-resistivity zone of the Ordovician basement reflected by the MT lines may be the secondary-fault development site at the rear edge of the Huanghe fault, which is caused by the fragmentation and water filling of Ordovician strata, showing certain exploration potential for geothermal resources.

Key words： eastern margin of the Yinchuan Basin electrical structure geothermal exploration

Received: 10 November 2023 Published: 21 October 2024

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	Articles by authors
	Yang WU
	Fu-Yuan ZHAO
	Xin-Jun HU
	Xiao-Jing CHEN
	Jin-Bing BU
	Shao-Peng GUO

Cite this article:

Yang WU,Fu-Yuan ZHAO,Xin-Jun HU, et al. Electrical structure characteristics and geothermal exploration directions of the upper crust on the eastern margin of the Yinchuan Basin[J]. Geophysical and Geochemical Exploration, 2024, 48(5): 1258-1267.

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https://www.wutanyuhuatan.com/EN/10.11720/wtyht.2024.1489 OR https://www.wutanyuhuatan.com/EN/Y2024/V48/I5/1258

Location of the study area and magnetotelluric survey lines
1—normal fault;2—reverse fault;3—strike slip fault;4—place name;5—MT line;6—Yellow River; AB—Alashan Block;YCB—Yinchuan Basin;OB—Ordos Block;TP—Qinghai-Tibet plateau;the blue box represents the research area

Geological map and location map of magnetotelluric survey points in the study area
1 —Quaternary;2—Neogene; 3—geological inference fault;4—MT site;5—typical MT site;6—place name;7—geothermal pore;YCB—Yinchuan Basin;OB—Ordos Block

Apparent resistivity and impedance phase curve diagram of typical sites
red lines—XY mode;blue lines—YX mode

The cloud maps of dimensionality for L1 line
a—1D skew;b—2D skew;c—2D effective fator

Statistical images of geo-electrical strikes for L1 line
a—rose diagram;b—frequency-based cloud diagram;c—site-based diagram

TM mode apparent resistivity and phase raw data (a、c) and response data (b、d) pseudo cross-sectional

Electrical structure model from 2D inversion of MT data along profiles

Comprehensive interpretation results of strata in the research area
a—L1 line;b—L2 line;c—L3 line;d—L4 line

Comprehensive interpretation results of DRT-03 well logging

Comprehensive interpretation results of faults in the research area
a—gravity anomaly in the research area;b—L1 line;c—L2 line;d—L3 line;e—L4 line

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