摘要
碳酸盐岩中中小型张性断层的破碎带是地下水赋存的有利场所,其与完整围岩形成的明显电性差异,使其成为电法找水工作中的主要目标体。通过对碳酸盐岩背景下不同倾角断层和不同交角的交叉断层模型开展高密度电阻率法正反演模拟研究,获得了判断倾斜断层顶部埋深、水平宽度、倾向、倾角和交叉断层空间结构特征的规律,并将该规律应用于鲁中南碳酸盐岩区寻找岩溶裂隙水的实例勘查中。结果表明,该规律有效指导了野外实测资料的反演解释与地质推断,可提高高密度电阻率法探测岩溶地区断层结构特征的准确率。
Forward and inverse modeling research is cavried out on karst terrains faults by electrical resistivity tomography method,with the following findings.The resistivity isoline dense zone indicates the lithologic interface,while the fracture zone shows the anomalous feature of the isoline dense distribution and relatively low resistance.In the inversion results,the buried depth,horizontal width and inclination on the top of the fault can be accurately determined.The inversion dip angle is larger than the actual dip angle.The smaller the dip angle,the larger the inversion dip angle will be.It is difficult to determine quantitatively the intersecting site range of cross faults due to the decrease of resolution and the volume effect.This law effectively guides the inversion interpretation and geological inference of field measured data.It can improve the accuracy of fault structure detection in karst terrains by electrical resistivity tomography method.
作者
杨妍妨
YANG Yan-fang(Institute of Karst Geology,CAGS/Key Laboratory of Karst Dynamics,MNR&GZAR CAGS,Guilin 541004,China)
出处
《桂林理工大学学报》
CAS
北大核心
2021年第1期62-69,共8页
Journal of Guilin University of Technology
基金
国家重点研发计划项目(2017YFC0406104)
国家自然科学基金项目(41572232)。
关键词
高密度电阻率法
正反演模拟
岩溶区
断层
结构特征
electrical resistivity tomography
forward and inversion modeling
karst terrains
fault
structure
