大地电磁资料在砂岩型铀矿地质体边界识别中的数值模拟研究  

Numerical Simulation Research on the Identification of Geological Body Boundaries in Sandstone-type Uranium Deposits Using Magnetotelluric Data

作　　者：赵丛[1,2,3] ZHAO Cong(Airborne Survey and Remote Sensing Center of Nuclear Industry,Shijiazhuang,Hebei 050002,China;Key Laboratory of Uranium Resources Geophysical Exploration Technology,China Nuclear Industry Group Company,Shijiazhuang,Hebei 050002,China;Hebei Key Laboratory of Airborne Survey and Remote Sensing Technology,Shijiazhuang,Hebei 050002,China)

机构地区：[1]核工业航测遥感中心,河北石家庄050002 [2]中核铀资源地球物理勘查技术中心(重点实验室),河北石家庄050002 [3]河北省航空探测与遥感技术重点实验室,河北石家庄050002

出　　处：《铀矿地质》2024年第4期740-756,共17页Uranium Geology

摘　　要：随着砂岩型铀矿勘查深度的逐渐增大,对大地电磁资料在砂体、断裂等地质体准确识别方面的要求也越来越高。为此,文章建立了多个典型模型,采用数值模拟手段,开展大地电磁资料在砂岩型铀矿地质体边界识别方面的研究。通过利用倾子响应参数、反演电阻率参数,并采用求导法、水平梯度法、解析信号法和Theta Map法进行处理,凸显了地质体的边界特征,并进行了对比分析。研究结果表明,倾子资料经处理后能够较好地识别地质体横向边界,求导方法在地质体纵向顶底界面识别中具有较大的指导意义,Theta Map法能够较好地识别地下介质的边界。然而,在多层地质体的情况下,Theta Map法的边界识别效果不如单层地质体效果好。本研究结果为大地电磁资料准确识别地质体提供了思路和方法。With the increasing demand for resource development and utilization,the requirement for the accuracy of geophysical detection data identification is also growing.In this paper,several typical models were established to carry out research on the identification of target boundaries.The tipper response data and single-point inversion resistivity curve processing were utilized,and the horizontal gradient method,analytical signal method,and Theta Map method commonly used in gravity and magnetic data processing were integrated into the inversion results of magnetotelluric data.Through comparative analysis,it was found that the tipper data can better identify the lateral boundaries,the derivative method has great guiding significance for the longitudinal top and bottom interfaces,and the Theta Map method can better identify the boundaries of underground media.However,the processing methods should be carefully selected based on actual geological conditions.This research provided an ideas for subsequent practical applications of boundary enhancement.

关 键 词：大地电磁法 数值模拟 倾子响应 水平梯度法 解析信号法 Theta Map法 

分 类 号：P631[天文地球—地质矿产勘探]