直流电测深法在沿海平原区地质填图中的应用——以苏北盆地连云港灌云地区为例

doi:10.11720/wtyht.2019.0054

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Abstract

In this study, the authors used direct-current sounding method (DC method) to explore the electrical resistivity property of Guanyun area in northern Jiangsu basin, based on the 1:50000 geological map. In combination with drilling, well-logging, geological combined profile and shallow layer reflection methods, the authors evaluated the economics and effectiveness of the DC method. The authors obtained the geomorphological electric characteristics of the study area based on the DC method,which provided a basis for the desalinization of saline-alkali land in the study area. The authors first obtained the distribution of brackish water in this area based on the salinization characteristics of underground water, and provided a guidance for the use of fresh water resources. Then, the authors described the distribution of fractures and regional bedrock surface, and fixed the location of the Huaiyin-Xiangshui fault in the northeastern part of the study area. In combination with the results of drilling, the authors holds that DC sounding is an effective and simple method of geological mapping in plain area and will be a useful compensation of the low borehole density in the study area. Therefore, it is suggested that the DC method is an effective exploration method and can be widely used in geological mapping in plain areas.

Key words： plain area geological mapping direct-current sounding method (DC) salty and fresh groundwater boundary northern Jiangsu basin Huaiyin-Xiangshui fault saline land

Received: 23 January 2019 Published: 15 August 2019

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	Shao-Bing TIAN
	Xiang-Qian LI
	Tong-Xiao SHANG
	Jian OU
	Da-Lian ZHANG

Cite this article:

Shao-Bing TIAN,Xiang-Qian LI,Tong-Xiao SHANG, et al. The application of direct-current sounding method in the coastal plains: A case study of Guanyun area in Lianyungang[J]. Geophysical and Geochemical Exploration, 2019, 43(4): 783-793.

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https://www.wutanyuhuatan.com/EN/10.11720/wtyht.2019.0054 OR https://www.wutanyuhuatan.com/EN/Y2019/V43/I4/783

The geographical locations of study area

Direct-current sounding profile location in the study area
1—survey line and number of DC; 2—DC points; 3—the DC points corresponding to seismic profiles ; 4—near-well sounding points; 5—drilling; 6—Sanduo formation; 7—Taizhou formation; 8—Yuntai Group; 9—river; 10—Urban residential areas; 11—drilling joint profile

Method of comparative analysis

The lithology and resistivity contrast analysis diagram of the GZK01 to GZK05 drilling in the study area

The comprehensive table of formation lithology and electrical characteristics

DC interpretation profile of AA'
a—resistivity profile of DC inversion; b—the inference of simple strata profile based on drillings;1—measuring point; 2—inferred strata interface; 3—inferred bedrock surface; 4—clay and silt clay layer; 5—clay and sand interbedded layer; 6—clay layer; 7—clay layer containing a small amount of sand; 8—sand layer; 9—granulitite; 10—sandstone and mudstone

Fig.4)
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DC interpretation profile of BB'(legend is the same as in Fig.4)

Contrastive Analysis of seismic interpretation and DC inversion profile
a—longitudinal wave seismic time section; b—seismic geological interpretation section; c—DC inversion resistivity section; d—the resistivity geological interpretation section;1—inferred sand body; 2—inferred strata interface; 3—infered bedrock surface; 4—infered fracture structure; 5— sand layer ; 6—clay and silt clay layer; 7—clay and sand interbedded layer; 8—clay layer; 9—granulitite; 10—sandstone and mudstone

The division of regional geomorphic boundary deduced from the the superficial average formation resistivity inferred with DC and saline-alkali land planning
a—the average resistivity of shallow surface formation; b—evaluation of salinity;1—inferred boundary of landform; 2—heavier salinization area; 3—lighter salinization area; 4—no salinization area; 5—monadnock mountain area; 6—river area

Salty and fresh groundwater boundary line of different elevation was inferred by the DC inversion resistivity section
(salty and fresh groundwater is demarcated by the resistivity of 5 Ω·m, less than 5 Ω·m was salt water area, greater than 5 Ω·m was fresh water area.)

The plane contour map of bedrock surface embedded depth inferred by DC

The DC inversion resistivity section of -150 and -250 meters and inferred fracture structure chart

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