摘要
古河道调查对于防震减灾、城市规划和地下水资源合理开发利用具有重要意义,本文针对徐州地区岩、土层具有显著电性差异的特点,采用高密度电阻率法对全新世古河道进行探测。首先通过地电模型数值模拟和钻孔附近现场试验探讨高密度电阻率法探测全新世古河道的有效性及装置形式选择;然后对高密度电阻率法断面、平面及三维成果图进行分析;最后通过钻孔资料对高密度电阻率法探测结果进行验证。理论研究及工程实践结果表明,徐州地区全新世古河道在电阻率图件上表现出典型的电场响应特征,通过响应特征分析可以获得古河道形态及地层结构等信息;高密度电阻率法偶极-偶极装置对覆盖层结构变化极为敏感,异常强度大,并且在地层分层方面具有明显优势,可作为古河道调查的首选装置;通过在调查区内布置多条测线,并借助三维可视化软件平台可以实现目标体三维空间解释,解释结果直观地展现出全新世古河道三维形态及空间展布特征。
Investigation of ancient channels is of great significance for earthquake disaster reduction,urban planning and reasonable development of ground water resources.Based on the significant electrical property difference of rock and soil in Xuzhou area,Holocene ancient channel was detected using high density resistivity method.Firstly,through numerical simulation of geoelectrical models and field test nearby boreholes,the effectiveness of high density resistivity method in detecting Holocene ancient channel and the device choice were discussed;Secondly,the result maps of section,plane and 3D were analyzed;Finally,the detecting result of high density resistivity method was verified by boreholes.Result of theoretical research and applied case indicates that Holocene ancient channels in Xuzhou area show representative electrical field response characteristics,inlonnation such as morphology and stratum structure of ancient channels can be obtained through the analysis of response characteristic;the dipole-dipole device of high density resistivity method is very sensitive to the structure variation of overburden,maximum anomalous intension,and it has certain advantages in the aspect of stratum division,so dipole-dipole device is the preferred device for the investigation of ancient channels;through arranging multiple survey lines in investigated area and with the help of 3D visual software platfor^m,3D spatial interpretation of target can be realized,and interpreted results will intuitively reveal the 3D morphology and spatial distribution characteristics of Holocene ancient channels.
作者
姜国庆
黄敬军
张大莲
徐士银
卢进添
JIANG Guo-Qing;HUANG Jing-Jun;ZHANG Da-Lian;XU Shi-Yin;LU Jin-Tian(Geological Survey of Jiangsu Province,Nanjing 210018,China)
出处
《物探与化探》
CAS
CSCD
北大核心
2018年第2期422-428,共7页
Geophysical and Geochemical Exploration
基金
中国地质调查局地勘项目(12120114022001
12120115043201)
江苏省地勘基金项目
关键词
古河道
地电模型
数值模拟
三维可视化
ancient channel
geoelectrical model
numerical simulation
3D visualization
