复杂地形条件下直流电阻率异常特征分析及地形改正方法研究  

DC Resistivity Abnormal Characteristics and Terrain Correction Method under Complex Terrain Conditions

作　　者：杨翼 刘浩[2] 黄学明 李煜 YANG Yi;LIU Hao;HUANG Xueming;LI Yu(China Energy Engineering Group Hunan Electric Power Design Institute Co.,Ltd,Changsha 410007,China;Shandong Electric Power Engineering Consulting Institute Co,Ltd,Jinan 250013,China)

机构地区：[1]中国能源建设集团湖南省电力设计院有限公司,湖南长沙410007 [2]山东电力工程咨询院有限公司,山东济南250013

出　　处：《红水河》2022年第6期118-123,共6页Hongshui River

基　　金：中国能源建设集团湖南省电力设计院有限公司科研项目(K3-03-2021)。

摘　　要：由于复杂地形严重影响直流电阻率测试,视电阻率易发生畸变,笔者根据稳定电流场的基本方程得出边值问题,并将边值问题转化为等价的变分问题,推导出变分方程;通过建立典型的地形地质模型,采用有限元法对模型进行正演数值模拟,分析和研究复杂地形条件下直流电阻率异常特性。结果表明:数值模拟解和解析解的相对误差在可接受范围之内;山脊地形出现低阻异常,山谷地形出现高阻异常,且随着坡度的增加电阻率畸变越显著。通过某风力发电工程实例,采用比较法对该工程的实测电阻率进行地形改正,验证了文中提出的地形改正方法的应用效果。Because the complex terrain conditions have a serious impact on the DC resistivity test, the apparent resistivity value is prone to distortion. The authors obtain the boundary value problem according to the basic equation of the stable current field, and transform the boundary value problem into an equivalent variational problem through the functional, and derive the variational equation. By establishing a typical terrain geological model, the forward numerical simulation of the model is carried out by using the finite element method, and the DC resistivity anomaly characteristics under complex terrain conditions are analyzed and studied. The results show that the relative error between the numerical simulation solution and the analytical solution is acceptable;Low resistivity anomaly occurs in ridge terrain and high resistivity anomaly occurs in valley terrain, and resistivity distortion becomes more significant with the increase of slope. Through an example of a wind power project, the topography correction of the measured resistivity of the project is carried out by using the comparison method, and the application effect of the terrain correction method proposed in this paper is verified.

关 键 词：地形改正 复杂地形 直流电阻率法 异常特征 有限元方法 风力发电 

分 类 号：P631.34[天文地球—地质矿产勘探]