不同供电方向激励对多极距组合中梯装置三维激电探测效果的影响  

Influence of Different Power Supply Direction Excitation on Three-Dimensional Induced Polarization Exploration Effect with Central Gradient Array of Multi-Group Power Supply Pole Distance Combination

作　　者：顾观文 王顺吉 李桐林[3] 武晔 许志河 Gu Guanwen;Wang Shunji;Li Tonglin;Wu Ye;Xu Zhihe(School of Earth Sciences,Institute of Disaster Prevention,Sanhe 065201,Hebei,China;Hebei Key Laboratory of Earthquake Dynamics,Sanhe 065201,Hebei,China;College of GeoExploration Sciences and Technology,Jilin University,Changchun 130026,China)

机构地区：[1]防灾科技学院地球科学学院,河北三河065201 [2]河北省地震动力学重点实验室,河北三河065201 [3]吉林大学地球探测科学与技术学院,长春130026

出　　处：《吉林大学学报（地球科学版）》2024年第1期292-309,共18页Journal of Jilin University：Earth Science Edition

基　　金：中央高校创新团队项目(ZY20215108);国家重大科学仪器设备开发专项(2011YQ050060);河北省高等学校科学技术研究项目(ZC2022056,ZC2021213);河北省硕士在读研究生创新能力培养项目(CXZZSS2023184)。

摘　　要：本文基于直流点电源三维非结构有限元数值模拟技术和不完全高斯-牛顿三维反演方法,讨论近些年兴起的多极距组合中梯装置三维激电法不同供电方向激励对探测效果的影响,为中梯装置三维激电测量供电方向的合理选择提供依据。首先,设计了多个不同的三维地电模型,在横向供电(供电方向垂直于构造走向或目标体延伸方向)、纵向供电(供电方向平行于构造走向或目标体延伸方向)、横向和纵向双方向组合供电3种方式下,开展理论模型的三维正反演试算。然后,选取某矿区在这三种方式下获取的三维激电实测数据进行三维反演。最后,对理论模型合成数据和实测数据的三维反演结果及矿区已有地质资料进行综合对比分析。研究结果表明:横向供电、纵向供电、横向和纵向双方向组合供电三种方式激电数据的三维反演结果均能有效反映研究区的岩性分布和构造展布特征;但在揭示研究区的局部异常信息方面,横向和纵向双方向组合供电方式激电数据的三维反演结果展示的异常信息更为丰富、完整,而横向供电或纵向供电单方向供电方式激电数据的三维反演结果揭示的异常信息不完整,有可能漏掉部分有效异常信息。This study investigates the impact of different power supply direction excitation on the exploration effect of the three-dimensional(3D)induced polarization(IP)method,for a central gradient array of multi-group power supply pole distance combinations.We employ the 3D unstructured finite element numerical simulation for direct current point power supply and the incomplete Gauss-Newton 3D inversion.The goal is to provide a basis for the rational selection of power supply directions for 3D IP measurements.First,we design various 3D geoelectric models and conduct forward and inverse modeling for three power supply modes:transverse,longitudinal,and transverse/longitudinal bidirectional combinations.Then we perform 3D inversion on IP measured data obtained in a mining area under these three power supply modes.Finally,the 3D inversion results of theoretical model synthesis data and measured data and the existing geological data of the mining area are synthetically analyzed.We find that 3D inversion results for IP data under transverse,longitudinal,and transverse/longitudinal bidirectional combination power supply modes can effectively depict the lithological and structural distribution characteristics.In terms of revealing local anomaly information,the bidirectional combined power supply IP data yields the most abundant and complete information.By contrast,the inversion results of single-directional power supply IP data may lack some effective anomaly information,presenting incomplete anomaly details.

关 键 词：激电法 中梯装置 三维 供电方向 反演 

分 类 号：P631.3[天文地球—地质矿产勘探] P319[天文地球—地质学]