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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摘要

以苏北盆地平原区1:5万灌云县、同兴街幅地质填图为例,在研究区内开展面积性电阻率测深勘探,辅以钻探、测井、地质钻孔联合剖面,浅层地震等方法,与电测深方法进行对比分析,突出该方法的经济性与有效性。利用电测深法获得了区内浅地表电性特征,为区内盐碱地的脱盐化提供依据;对区内地下水咸化特征进行了刻画,获得了区内咸淡水分布特征并对区域内淡水资源的利用提供指导;对区域基岩面特征及断裂构造特征进行划分,在区域东南角划分NE向淮阴—响水断裂。通过钻孔验证,认为直流电测深法在平原区地质填图中可以有效弥补钻孔密度的不足,是一种简单有效的勘探方法,值得在平原区地质填图中广泛应用。

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	田少兵
	李向前
	尚通晓
	欧健
	张大莲

关键词 ：平原区填图, 直流电测深法, 咸淡水界线, 苏北盆地, 淮阴—响水断裂;, 盐碱地

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

收稿日期: 2019-01-23 出版日期: 2019-08-15

P631

基金资助:中国地质调查局地质调查项目“特殊地质地貌区填图试点”(DD20160060);江苏省地质勘查基金项目“连云港城市地质调查”;中国地质调查局全国地质构造区划与区域地质调查综合集成项目“江苏区域地质调查片区总结与服务产品开发”

作者简介: 田少兵(1990-),男,河南人,工程师,硕士,主要研究方向为地球探测与信息技术。Email: 506006927@qq.com

引用本文:

田少兵, 李向前, 尚通晓, 欧健, 张大莲. 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[J]. 物探与化探, 2019, 43(4): 783-793.
Shao-Bing TIAN, Xiang-Qian LI, Tong-Xiao SHANG, Jian OU, Da-Lian ZHANG. The application of direct-current sounding method in the coastal plains: A case study of Guanyun area in Lianyungang. Geophysical and Geochemical Exploration, 2019, 43(4): 783-793.

链接本文:

https://www.wutanyuhuatan.com/CN/10.11720/wtyht.2019.0054 或 https://www.wutanyuhuatan.com/CN/Y2019/V43/I4/783

Fig.1 研究区地理位置

Fig.2 研究区电测深点位分布
1—电测深测线与编号;2—电测深测点;3—地震剖面电测深点;4—井旁十字测深点;5—钻孔;6—三垛组;7—泰州组;8—云台岩群;9—地表河流;10—城镇居民区;11—钻孔联合剖面

Table 1 多种方法对比分析

Fig.3 研究区GZK01~GZK05钻孔岩性与电阻率对比结果

Table 2 地层岩性与电性特征综合分析结果

Fig.4 AA'剖面电测深解释剖面
a—电测深反演电阻率剖面;b—结合钻孔推断简易地层剖面;1—测点;2—推断地层界面;3—推断基岩顶界面;4—黏土与淤泥质黏土层;5—黏土与砂互层;6—黏土层;7—黏土夹砂层;8—砂层;9—变粒岩;10—砂岩与泥岩

Fig.5 BB'剖面电测深解释剖面(图例同图4)

Fig.6 地震解释与电测深反演剖面对比
a—纵波反射地震时间剖面;b—地震地质解释剖面;c—电测深反演电阻率剖面;d—电阻率地质解释剖面;1—推断砂体;2—推断地层界面;3—推断基岩顶界面;4—推断断裂构造;5—砂层;6—黏土与淤泥质黏土层;7—黏土与砂互层;8—黏土层; 9—变粒岩;10—砂岩与泥岩

Fig.7 电测深反演电阻率等值线平面及盐碱地界线划分
a—浅地表地层平均电阻率等值线平面;b—盐碱化评价;1—推断地貌划分界线;2—盐碱化较重区域;3—盐碱化较轻区域;4—无盐碱化区域;5—山体残丘区域;6—地表河流

Fig.8 直流电测深反演电阻率不同标高切片推断咸淡水界线
(以电阻率5 Ω·m等值线为界线,小于5 Ω·m为咸化区,大于5 Ω·m为未咸化区)

Fig.9 电测深推断基岩面埋深平面等值线

Fig.10 研究区电测深反演电阻率-150 m、-250 m切片平面等值线图及推断断裂构造

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