高密度电阻率法比值参数基于阻尼最小二乘反演

doi:10.11720/wtyht.2019.1144

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Abstract

The detection accuracy of the array and the study of data processing methods about the three-potential observation system always constitute a hot spot for geophysicists, and there are also many controversies. In this paper, forward modeling results are used to discuss the detecting accuracy of three devices under several possible geological conditions in karst area. It is found that β array and γ array are significantly more precise than wenner α array; then, the ratio parameter (T) is composed of forward’s result. With least-squares inversion on the data of T, the authors found that the result of T’s least-squares inversion is consistent with the inverse result of apparent resistivity, and the result of inversion result is better than the T contour map in an area where the noise is large. For the result of the T’s least-squares inversion, it can be used as a basis for judging the anomalous body characteristics and the inverse result of apparent resistivity, and it can also be used to make up the effect of noise on a single device. Taking the hydrogeological survey of a certain place in Yima as an example, the authors found that the result of the T’ least-squares inversion in the low-water-resistance region is small, the abnormal bodies’ boundaries are accurate, and the structural features are obvious. It is shown that the result of the T least-squares inversion is very useful for data processing and interpretation, and therefore researchers should pay attention to it in future.

Key words： three-potential electrode system forward modeling least square inversion ratio parameter’s inversion hydrogeological survey

Received: 03 April 2018 Published: 10 April 2019

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	Articles by authors
	Cheng-Gong LIU
	Sheng JIN
	Wen-Bo WEI
	Jian-En JING
	Gao-Feng YE
	Yao-Tian YIN

Cite this article:

Cheng-Gong LIU,Sheng JIN,Wen-Bo WEI, et al. The least squares inversion of high-density resistivity method ratio parameter based on smooth constraint[J]. Geophysical and Geochemical Exploration, 2019, 43(2): 351-358.

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https://www.wutanyuhuatan.com/EN/10.11720/wtyht.2019.1144 OR https://www.wutanyuhuatan.com/EN/Y2019/V43/I2/351

Schematic diagram of the arrangement of the electrodes of the Winner α, β, γ devices

Low-resistance model profile and parametric profile
a—low-resistance geological model section; b—sectional view of resistivity of the alpha device; c—sectional view of the resistivity of the beta device;d—sectional view of the resistivity of the gamma device; e— ratio parameter (T) pseudo sectional view; f—ratio parameter (T) sectional view

High-resistance model profile and parametric profile
a—high-resistance geological model section;b—sectional view of resistivity of the alpha device;c—sectional view of the resistivity of the beta device;d—sectional view of the resistivity of the gamma device ;e—ratio parameter (T) pseudo sectional view;f—ratio parameter (T) sectional view

Complex model profile and parameter profile
a—complex electrical geological model section; b—sectional view of resistivity of the alpha device;c—sectional view of the resistivity of the beta device; d—sectional view of the resistivity of the gamma device;e—ratio parameter (T) pseudo sectional view; f—ratio parameter (T) sectional view

Sectional view of measured section parameters
a—sectional view of resistivity of the alpha device; b—sectional view of the resistivity of the beta device;c—sectional view of the resistivity of the gamma device; d—ratio parameter (T) pseudo sectional view; e—ratio parameter (T) sectional view

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