等值反磁通瞬变电磁法在城市地质调查中的应用

doi:10.11720/wtyht.2023.1554

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Abstract

With the rapid development of urban infrastructure,the demand for urban geological work is increasing,and urban geological surveys become particularly important.Urban geophysical exploration has different exploration purposes and working environments from conventional geophysical exploration.Accordingly,compared with conventional geophysical exploration methods,the geophysical exploration methods for urban geological surveys face the challenges of many interference factors,limited construction sites and time,and high requirements for exploration accuracy.The opposing-coils transient electromagnetic(OCTEM) method enjoys a strong anti-interference ability,convenient and efficient construction,and high resolution.Therefore,this study employed the OCTEM method to investigate the test profile in the urban geological survey and evaluation of Haidong City.This test profile was subjected to numerous interference sources since it crossed 11 highways and railways and passed through factories,schools,logistics parks,villages,living quarters,and rivers.Consequently,the OCTEM results agree well with the results of single-point resistivity sounding and drilling results.Therefore,the OCTEM method proposed in this study is effective for urban geological surveys.

Key words： opposing-coils transient electromagnetic method urban geology interference source resistivity sounding

Received: 24 November 2022 Published: 27 October 2023

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	Articles by authors
	Sheng HE
	Wan-Ping WANG
	Gao-Feng DONG
	Xiu-Jia NAN
	Feng-Feng WEI
	Yong-Yong BAI

Cite this article:

Sheng HE,Wan-Ping WANG,Gao-Feng DONG, et al. Application of the opposing-coils transient electromagnetic method in urban geological surveys[J]. Geophysical and Geochemical Exploration, 2023, 47(5): 1379-1386.

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https://www.wutanyuhuatan.com/EN/10.11720/wtyht.2023.1554 OR https://www.wutanyuhuatan.com/EN/Y2023/V47/I5/1379

Schematic diagram of geophysical prospecting work layout

Statistical of formation electrical and physical properties in the study area

OCTEM coils and its primary magnetic field line on the diametric plane

Original secondary field profile(a) and comprehensive result map(b) of OCTEM W1 section

Resistivity sounding D1(ZK6) single point curve

Resistivity sounding D2(ZK4) single point curve

Resistivity sounding D3(ZK3) single point curve

Original secondary field profile(a) and comprehensive result map(b) of OCTEM W2 section

Original secondary field profile(a) and comprehensive result map(b) of OCTEM W3 section

Three-dimensional slice result of OCTEM

序号	钻孔编号	孔深/m	地层埋深/m	岩性	地下水位/m
1	ZK3	45.1	0~3.0	黄土状土:灰黄色、黄褐色,稍湿稍密—中密,主要成分为粉土,手搓着砂感,干强度低韧性低,可搓成2~3 mm的土体	11.4
			3.0~9.0	碎石:灰白色,稍湿,稍密,一般粒径30~40 mm,碎成分主要为石英岩、砂岩、花岗岩及少量浅色变质岩等
			9.0~33.7	卵石:青灰色、灰白色,稍湿—湿,中密,一般粒径20~30 mm,成分主要为石英岩、砂岩、花岗岩及少量浅色变质岩等
			33.7~45.1	砂岩:33.7~36.4 m为强风化砂岩,36.4~41.4 m为中风化砂岩,41.4~45.1 m为微风化砂岩
2	ZK4	22.5	0~9.8	卵石:青灰色、灰黄色,稍湿,松散,一般粒径0.2~6 cm,最大7 cm,成分以石英岩、花岗岩为主	2.1
2	ZK4	22.5	9.8~22.5	泥岩:9.8~12.5 m为强风化泥岩,12.5~20.2 m为中风化泥岩,20.2~22.5 m为微风化泥岩	2.1
3	ZK5	31.2	0~13.5	卵石:青灰色,稍湿—饱水,稍密—中密,砾石约占20%,卵石约占70%,余为中粗砂,成分以砂岩、石英岩、花岗岩为主	无
3	ZK5	31.2	13.5~31.2	泥岩:13.5~19.4 m为强风化泥岩,19.4~27.7 m为中风化砂岩,27.7~31.2 m为微风化泥岩	无
4	ZK6	30.1	0~6.6	黄土状土:黄褐色,稍湿,稍密,手搓有砂感,刀切面粗糙,无光泽反应,强度低,手掰易碎,成分以粉土为主	11.1
			6.6~15.2	卵石:青灰色,湿,密实,一般粒径0.2~4 cm,最大5 cm,卵砾石成分以石英岩、花岗岩为主
			15.2~30.1	泥岩:15.2~18.1 m为强风化泥岩,18.1~24.5 m为中风化泥岩,24.5~30.1 m为微风化泥岩
5	ZK16	31.0	0~5.4	黄土状土:黄褐色,稍湿,松散,手版易碎,干强度低,成分以粉土为主
			5.4~10.5	卵石:青灰色,稍湿,稍密—密实,含砂及圆砾,一般粒径0.5~8 cm,最大11 cm
			10.5~31.0	泥岩:10.5~12.3 m为强风化,12.3~27.5 m为中风化,27.5~31.0 m为微风化
6	ZK17	33.4	0~2.0	黄土状土:黄褐色,稍湿,稍密,成分主要为粉土,具孔隙,土质较均匀
			2.0~10.8	卵石:青灰色、灰白色,稍湿—饱和,稍密—密实,最大粒径110 mm,分选性一般
			10.8~33.4	泥岩:10.8~15.2 m为强风化,15.2~27.3 m为中风化,27.3~33.4 m为微风化
7	ZK33	24.4	0~2.4	黄土状土:红褐色,稍湿,松散,成分以粉土为主
			2.4~10.0	卵石:青灰色,稍湿,稍密—密实,含砂及圆砾,一般粒径0.5~8 cm,卵石磨圆度一般
			10.0~24.4	泥岩:10.0~18.1 m为强风化,18.1~22.3 m为中风化,22.3~24.4 m为微风化
8	ZK34	49.95	0~5.3	黄土状土:灰黄色、黄褐色,稍湿,主要成分为粉土
			5.3~34.0	卵石:青灰色,稍湿—饱水,主要成分为石英、长石
			34.0~49.95	泥岩:34.0~41.6 m为强风化,41.6~47.3 m为中风化,47.3~49.95 m为微风化

Statistical of geological drilling well data in study area

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