综合物探方法在隐伏岩溶探测中的应用

doi:10.11720/wtyht.2022.1566

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Abstract

Karst is widely distributed in China. However, geological disasters frequently occur in karst zones due to the fragile geological environment, which seriously threatens the safety of people’s life and property and cause huge economic losses. In this study, the controlled source audio-frequency magnetotelluric (CSAMT) method and microgravity were used to extract residual gravity anomalies through the two-dimensional inversion of pseudosections and multi-scale wavelet analysis. As a result, rock-soil interfaces of karst zones and the development zones of strong karst were well divided; the locations, burial depths, scales, and spatial distribution of karst caves were delineated. As verified by drilling, the rock-soil interfaces and strong-karst development zones determined by CSAMT interpretation were roughly consistent with those revealed by boreholes, and the sizes and burial depths of collapsed karst caves that were delineated by microgravity roughly correspond to those revealed by boreholes of engineering exploration. These results show that the CSAMT combined with the microgravity method can achieve significant effects in the detection of concealed karst collapses and serves as a scientific detection method for the early warning of the prevention and treatment of potential karst collapses and similar geological disasters.

Key words： karst collapse CSAMT microgravimetry

Received: 19 October 2021 Published: 03 January 2023

ZTFLH:

P631

Corresponding Authors: FENG Xu-Liang E-mail: 546864271@qq.com;fxlchd@163.com

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	Jian ZHANG
	Xu-Liang FENG
	Xiang-Ping YUE

Cite this article:

Jian ZHANG,Xu-Liang FENG,Xiang-Ping YUE. Application of comprehensive geophysical prospecting method in detecting concealed karst collapses[J]. Geophysical and Geochemical Exploration, 2022, 46(6): 1403-1410.

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https://www.wutanyuhuatan.com/EN/10.11720/wtyht.2022.1566 OR https://www.wutanyuhuatan.com/EN/Y2022/V46/I6/1403

Regional geological map
1—Jurassic Suining formation;2—Jurassic upper Shaximiao formation;3—Jurassic lower Shaximiao formation; 4—Jurassic Zhenzhuchong formation、Ziliujing formation、Xintiangou formation;5—Triassic Xujiahe formation;6—middle lower Triassic;7—upper Permian Longtan formation;8—CSAMT line PM01 position;9—rivers

Stratigraphic lithology in the study area

Geophysical profile layout and geological sketch in the study area
1—upper Xujiahe formation;2—lower Xujiahe formation;3—Leikoupo formation;4—4th member of Jialingjiang formation;5—3rd member of Jialingjiang formation;6—2nd member of Jialingjiang formation;7—1st member of Jialingjiang formation;8—4th member of Feixianguan formation;9—3rd member of Feixianguan formation;10—2nd member of Feixianguan formation;11—1st member of Feixianguan formation;12—Tianchi;13—measured fault;14—CSAMT section line;15—microgravity section line;16—anticlinal sign;17—karst collapse area;18—Xiema tunnel

Statistical table of rock material parameters

CSAMT measurement and inversion parameters

CSAMT measurement test section 2D inverted resistivity section and interpretation
1—salt soluble breccia;2—arkose;3—silty mudstone;4—dolomite;5—limestone; 6—mudstone; 7—section direction; 8—presumptive fault; 9—measured faults; 10—estimate stratigraphic boundaries; 11—speculate karst development zone; 12—survey boreholes; 13—ground object labeling

CSAMT measures PM01 profile 2D inversion resistivity section and deciphering
1—salt soluble breccia; 2—arkose; 3—silty mudstone; 4—dolomite; 5—limestone; 6—mudstone; 7—section direction; 8—strata occurrence; 9—measured faults; 10—presumed fault; 11—estimate stratigraphic boundaries; 12—karst development zone is presumed; 13 —cave; 14—ground object labeling; 15—hydrological observation borehole; 16—survey borehole

Contour map of bouguer gravity anomaly(a) and residual gravity anomaly(b)
1—gravity anomaly isoline; 2—delineate the scope of karst collapse; 3—bouguer gravity anomaly contour map; 4—residual gravity anomaly contour map extracted by wavelet decomposition; 5—survey boreholes; 6—microgravity survey line and number

Residual gravity anomalies(a) and 2.5D inversions(b)
ρ_L0=0.8 g/cm³;ρ_L1=0.8 g/cm³;ρ_L2-1=1.5 g/cm³;ρ_L2-2=0.2 g/cm³;ρ_L3=0.8 g/cm³;ρ_L4=1.5 g/cm³;ρ_L5=1.5 g/cm³

Two-degree half-inverted circle fixed collapse abnormal body features

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