极寒环境中广域电磁法勘探技术研究

doi:10.11720/wtyht.2020.0189

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Abstract

In order to extend the construction field of the wide field electromagnetic method and break through the restricted area of the wide field electromagnetic method application under extremely cold conditions, the authors studied the experimental technology of wide field electromagnetic method under extremely cold conditions. A comparative test was carried out between the exposed permafrost in spring and the extremely cold conditions and the exposed permafrost and the unexposed permafrost in the extremely cold conditions. The feasibility of construction under extremely cold conditions was explored. Various warm-keeping methods and measures to overcome the high resistance of frozen soil layers were applied in practice, and a set of exploration technological means under extremely cold conditions were summarized,which can be used to carry out the wide field electromagnetic method construction under extremely cold conditions so as to ensure the quality of data.

Key words： wide field electromagnetic method extremely cold conditions permafrost

Received: 21 April 2020 Published: 26 October 2020

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	Articles by authors
	Shao-Quan ZHAN
	Ai-Yong LI
	Dao-Li WANG
	Hong-Lei HAO
	Lei WANG

Cite this article:

Shao-Quan ZHAN,Ai-Yong LI,Dao-Li WANG, et al. A study of the wide field electromagnetic method under extremely cold conditions[J]. Geophysical and Geochemical Exploration, 2020, 44(5): 1019-1024.

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https://www.wutanyuhuatan.com/EN/10.11720/wtyht.2020.0189 OR https://www.wutanyuhuatan.com/EN/Y2020/V44/I5/1019

Location map of the test area

地层层序				厚度/m	标志性岩性
系	统	组	代号	厚度/m	标志性岩性
第四系				0~143	黏土与砂层、砂砾层,盆地北部有近代玄武岩喷发
新近系		泰康组	N₂t	0~165	上部灰黄-灰绿色泥岩和泥质粉砂岩,下部灰黄色砂砾层
新近系		大安组	N₁d	0~123	上部灰色泥岩、页岩夹砂岩,下部砂砾层
古近系		依安组	E₃y	0~250	泥岩、砂质泥岩、粉砂岩,时夹薄层褐煤,底部砂砾岩
白垩系	上统	明水组	K₂m	0~624	上段为泥岩、砂质泥岩与灰绿色砂岩互层;下段灰黑、灰色泥页岩,灰绿、灰色泥质粉砂岩、砂岩、砂砾岩
		四方台组	K₂s	0~413	棕红、灰绿色泥岩、砂质泥岩夹棕红色砂岩、砂砾岩
		嫩江组	K₂n	157~1237	共分五段,主要岩性为砂岩、粉砂岩与泥岩等
		姚家组	K₂y	60~230	共分为三段,主要岩性为泥岩、粉砂岩,盆地中部有灰黑色泥岩、薄层油页岩。盆地边缘为厚层砂砾岩
		青山口组	K₂qn	78~716	共分为三段,盆地中部、东南部为灰黑色泥岩夹薄层粉砂岩,底部夹油页岩。盆地边缘为厚砂层砂砾岩
	下统	泉头组	K₁q	0~2154	共分为四段,主要岩性为泥岩、泥质粉砂岩、粉砂岩等,第三段和第四段夹灰色、黑褐色含油粉砂岩
	下统	登娄库组	K₁d	0~1739	分为四段,主要岩性为泥岩、细砂岩、砂岩,底部见砾岩
二叠系	上统	林西组	P₃l		灰黑色砂泥质板岩、板岩,黑色板状千枚岩、变余粉砂岩、变质粉砂岩
	中统	哲斯组	P₂z		黑色泥板岩、变余砂砾岩、泥灰岩、石灰岩夹强碳酸盐化流纹岩互层及夹有安山岩
	下统	大石寨组	P₁d		上部以中性熔岩及凝灰岩为主,夹泥板岩、凝灰质砂岩等;下部以中酸性熔岩及凝灰岩为主
	下统	寿山沟组	P₁ss		粉砂岩、凝灰质砂岩、千枚岩
石炭系	上统	阿木山组	C₂a		一套海相碳酸盐岩及碎屑岩地层,中部和下部夹有少量砂岩、粉砂岩及泥岩
	上统	本巴图组	C₂b		以砂岩为主夹灰岩及火山岩组合
		色日巴彦敖包组	D₃-C₁		下部为紫灰色中细粒杂砂岩与钙质粉砂岩互层;上部为黄褐-紫灰色中细粒钙质长石石英砂岩与粉砂岩互层
前古生界			AnPz		花岗片麻岩、片麻状花岗岩、片岩类等

Main strata table in the test area

Resistivity statistical results of borehole logging in working area

Comprehensive geological section based on 2D resistivity inversion of the test section

Comparison of construction parameters of unexposed permafrost under spring and extreme cold conditions

Comparison of frequency-resistivity curves of unexposed permafrost under spring and extreme cold conditions

Unexposed (a) and exposed permafrost (b)

Collection parameters of exposed and unexposed permafrost under extremely cold conditions

Comparison of frequency-resistivity curves between unexposed and exposed permafrost under extremely cold conditions

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