广域电磁法在低阻覆盖区的应用与评价——以河南中牟为例

doi:10.11720/wtyht.2020.0198

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Abstract

Based on an analysis and summary of the physical properties of the gas-bearing shale layer in Zhongmu area of Henan Province, the authors used the wide-area electromagnetic exploration technology to detect shale gas in the low-resistance coverage area of the Nanhua Basin, obtained the distribution regularity and characteristics of the stratigraphic resistivity within 5km under the work area, and ascertained the structural distribution of the work area. In addition, the development characteristics of gas-bearing shales were revealed, with the main target layers being the Permian Taiyuan Formation, Shanxi Formation, Upper Shihezi Formation and Lower Shihezi Formation. The results show that, in the low-resistance coverage area, the wide-field electromagnetic method is an effective detection method to obtain the buried depth and distribution range of deep gas-bearing shale in the Nanhua Basin, providing geophysical parameters for the evaluation of favorable zones in the later period and the optimization of shale gas layers in the block.

Key words： low resistance coverage area Nanhua basin wide field electromagnetic method gas-bearing shale

Received: 20 March 2020 Published: 26 October 2020

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	Articles by authors
	Hong-Jun TIAN
	Wen-Bin YIN
	Guang-Di LIU
	Yong-Fang JIANG
	Wen-Bing YOU

Cite this article:

Hong-Jun TIAN,Wen-Bin YIN,Guang-Di LIU, et al. The application and evaluation of the wide field electromagnetic method in the low resistance coverage area-Exemplified by Zhongmu area of Henan Province[J]. Geophysical and Geochemical Exploration, 2020, 44(5): 1025-1030.

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https://www.wutanyuhuatan.com/EN/10.11720/wtyht.2020.0198 OR https://www.wutanyuhuatan.com/EN/Y2020/V44/I5/1025

Stratigraphic table of the electrical characteristics of Mou 1 well

Forward curve and abnormal percentage curve of wide field electromagnetic method
a— comparison of apparent resistivity curves; b— percentage of exceptions

Layout of widefield electromagnetic survey line
a—field construction schematic diagram of wide-area electromagnetic method; b—line deployment chart

Line55.4 comprehensive achievement profile
a—quasi seismic section; b—inversion results and geological interpretation profile

Line54 comprehensive achievement profile
a—quasi seismic section; b—inversion results and geological interpretation profile

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