文山小河尾水库岩溶含水渗漏通道的地球物理新证据

doi:10.11720/wtyht.2023.1244

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Abstract

As a karst reservoir with the highest altitude in Wenshan City,the Xiaohewei reservoir has been suffering from severe water seepage since its completion.Despite several seepage control treatments,the seepage of the reservoir is still not effectively controlled.To determine the locations of underground karst seepage pathways of the reservoir and guide the later seepage control project,this study detected the seepage pathways in the project area combining the high-density resistivity method and the audio magnetotelluric method.The 2D inversion trial calculation of geophysical testing data indicates the feasibility of combining the two methods.The methods show highly consistent geophysical anomaly positions and can accurately reflect the geological conditions at different burial depths.Thus,their detection results can be referenced for later design and construction.Based on the inversion of measured data,the surface geological data,and the drilling verification means,it is speculated that the reservoir mainly has two NNE-directed karst water-bearing seepage pathways with an elevation of more than 1 800 m.These two karst seepage pathways (No.1 and No.2) are located near the contact zone between limestones and siliceous rocks,and in the karst fissures inside limestones,respectively.Based on the geophysical exploration results,this study also puts forward some suggestions on the deployment of the curtain grouting project for later seepage control of the Xiaohewei reservoir.

Key words： geophysical exploration karst reservoir seepage pathway audio magnetotelluric method high-density resistivity method

Received: 20 May 2022 Published: 05 July 2023

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	Articles by authors
	Jian-Bing ZHOU
	Rui-Heng LUO
	Chang-Kun HE
	Xiao-Dong PAN
	Shao-Min ZHANG
	Cong PENG

Cite this article:

Jian-Bing ZHOU,Rui-Heng LUO,Chang-Kun HE, et al. New geophysical evidence for karst water-bearing seepage pathways in the Xiaohewei reservoir,Wenshan City[J]. Geophysical and Geochemical Exploration, 2023, 47(3): 707-717.

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https://www.wutanyuhuatan.com/EN/10.11720/wtyht.2023.1244 OR https://www.wutanyuhuatan.com/EN/Y2023/V47/I3/707

Hydrogeological map of the study area

Electrical parameters of rock and soil medium in the study area

Geological survey of work area and layout of geophysical prospecting work

Inversion of resistivity section by high density electrical method

Equivalent section of AMT 2D inversion resistivity of line 4(a) and geological inference interpretation section(b)

Equivalent section of AMT 2D inversion resistivity of line 5(a) and geological inference interpretation section(b)

Equivalent section of AMT 2D inversion resistivity of line 6 (a) and geological inference interpretation section (b)

Histogram of borehole lithology of ZK1(a) and ZK2(b) in Xiaohewei reservoir

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