基于颜色融合技术的综合跨孔层析岩溶探测方法

doi:10.11720/wtyht.2024.0247

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Abstract

Single crosshole tomography features a multiplicity of solutions, rendering it challenging to accurately identify karst anomalies. Given this, this study introduced color fusion technology and tested its effectiveness in the inversion of three types of crosshole seismic CT data using numerical simulations: elastic wave travel time CT, elastic wave attenuation CT, and electromagnetic wave attenuation CT. A field experiment on karst identification using comprehensive crosshole CT data reveals that the color fusion technology can effectively enhance the accuracy of karst identification. The results of this study provide an effective method for comprehensive crosshole detection and interpretation for karst exploration in foundational projects such as oil and gas pipelines, bridges, and tunnels, holding great significance for improving the exploration accuracy of karst.

Key words： karst cave detection crosshole tomography elastic wave CT electromagnetic wave CT RGB color fusion

Received: 29 May 2024 Published: 08 January 2025

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	Xiao-Dong MOU

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Xiao-Dong MOU. A comprehensive crosshole tomography method for karst identification based on color fusion technology[J]. Geophysical and Geochemical Exploration, 2024, 48(6): 1730-1740.

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https://www.wutanyuhuatan.com/EN/10.11720/wtyht.2024.0247 OR https://www.wutanyuhuatan.com/EN/Y2024/V48/I6/1730

Schematic diagram of grid discretization in cross hole CT inversion

Numerical model with two karst caves

地层	纵波速度/ (m·s^-1)	横波速度/ (m·s^-1)	密度/ (g·cm^-3)	品质因子Q_p	品质因子Q_s	相对介电常数	相对磁导率	电导率/ (s· $m - 1$ )	中心点坐标
灰岩	2500	1450	2.5	50	15	9	1	0.001
溶洞Y1	1500	0.25	1	10	5	81	1	0.003	(15,17.5)
溶洞Y2	1000	525	1.5	20	10	30	1	0.0025	(15,37)

Physical property parameters of mumerical model

Snapshot of elastic wave propagation corresponding to an excitation depth of 25 m

Snapshot of elctromaganetic wave propagation corresponding to an excitation depth of 25 m

Observations of elastic waves and electromagnetic waves excited at the depth of 25 m

Inversion results by different methods and corressponding RGB fusion result

Distribution of boreholes and cross-hole CT sections

Core condition of karst cave exposed by drilling

Basic Situation of karst caves development exposed by drilling

Results with different inversion methods for ZK05~ZK03、ZK03~ZK01 profile

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