巨厚新生界覆盖区煤炭勘查中的电震综合方法应用

doi:10.11720/wtyht.2021.0127

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Abstract

The huge Cenozoic sediments have a strong absorption and attenuation effect on electromagnetic waves and seismic waves, and it is difficult for a single method to achieve the purpose of coal exploration. In the coal exploration of a huge Cenozoic coverage area at the western foot of the Xiangshan Mountain in Ningxia, the investment in 2D seismic exploration failed to achieve the expected purpose. In this study, the electrical method with controlled source audio magnetotelluric method as the main and direct current sounding as the supplementary method was implemented for exploration. The comprehensive method successfully delineated the range of coal-bearing strata and determined the coal-bearing nature of the coal-bearing strata. Through drilling verification and subsequent geological survey work, the comprehensive method of electro-seismic was proved to be economical and effective in coal prospecting in the area covered with huge Cenozoic sediments.

Key words： thick Cenozoic sediments seismic exploration CSAMT integrated geophysics coal exploration

Received: 10 March 2021 Published: 15 December 2021

ZTFLH:

P631

Corresponding Authors: YAN Zhao-Tao E-mail: yyp0527@126.com;1020437919@qq.com

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	Articles by authors
	Yong-Peng YU
	Zhao-Tao YAN
	Xing-Jun MAO
	Yan-Cheng YANG
	Yong-Xiang MA
	Peng-Cheng HUANG
	Ai-Guo LU
	Guang-Bing ZHANG

Cite this article:

Yong-Peng YU,Zhao-Tao YAN,Xing-Jun MAO, et al. The application of the comprehensive electric and seismic method to coal exploration in the huge Cenozoic coverage area[J]. Geophysical and Geochemical Exploration, 2021, 45(5): 1231-1238.

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https://www.wutanyuhuatan.com/EN/10.11720/wtyht.2021.0127 OR https://www.wutanyuhuatan.com/EN/Y2021/V45/I5/1231

Regional geology and engineering layout of the study area

Characteristics of formation resistivity in the study area

Electrical depth-inversion resistivity curve of measuring point V1 and simple histogram of drilling hole

地层名称		钻孔揭露底界/m	$VES 反演结果底界 / m 反演电阻率 / (Ω · m)$		$CSAMT 反演结果底界 / m 反演电阻率 / (Ω · m)$
新生界	中上部		275	12	260	6~14
新生界	底部砾石层	345.04	345	30	340	21
侏罗系延安组		593.40	593	16	585	12~18
侏罗系芨芨沟组		732.22	732	>29	745	>25
二叠系		未揭穿

Comparison table of CSAMT inversion results and drilling disclosures next to the ZK3 hole

CSAMT inversion of resistivity contour section and inference interpretation diagram of line D3

Seismic exploration time profile and inference interpretation diagram of line D3

D3 line geological section map

Verification results of drilling ZK5

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