层状介质背景下地-井方位激电异常分析与解释  

Analysis and interpretation of surface-borehole azimuth IP anomaly under layered medium

作　　者：袁紫豪 吕玉增[1] 韦柳椰[1] YUAN Zihao;LYU Yuzeng;WEI Liuye(College of Earth Sciences,Guilin University of Technology,Guilin 541006,Guangxi,China)

机构地区：[1]桂林理工大学地球科学学院,广西桂林541006

出　　处：《矿产与地质》2024年第1期154-159,167,共7页Mineral Resources and Geology

基　　金：国家自然科学基金项目(编号:42274182,41764005);广西重点研发计划(桂科AB22035045);广西有色金属隐伏矿床勘查及材料开发协同创新中心创新团队项目(GXYSXTZX2017-Ⅱ-5)共同资助。

摘　　要：为了更好地探究层状介质背景下井旁隐伏矿体的地-井方位激电异常特征,首先研究了地-井三维激电的有限元正演模拟算法,并编制了程序;然后构建三维地电模型并进行正演模拟,讨论层状介质背景下地-井方位激电异常,并分析其异常特征规律;最后通过比值法归一化压制层状介质背景,突出局部异常。理论和算例表明,比值法归一化处理是地-井方位激电观测中消除层状介质背景异常影响的有效方法。In order to better explore for the characteristics of surface-borehole azimuth IP anomaly of underground concealed ore bodies under layered medium condition,the article has firstly studied the finite element forward simulation algorithm for three-dimensional induced polarization in the surface-borehole direction survey,and has also developed a program as well.Secondly,a three-dimensional geoelectric model is constructed and forward simulation is conducted to discuss the azimuth induced polarization anomaly of the surface-drilling hole under the layered medium background,and to analyze their characteristic regularity.Finally,the ratio method is used to normalize and suppress the layered medium background to highlight the useful anomaly.Theoretical result and numerical example indicate that the ratio method normalization processing is an effective method for eliminating the influence of layered medium background anomalies in ground-borehole azimuth induced polarization observation.

关 键 词：层状介质背景 地-井方位观测 激发极化法 比值法归一化 

分 类 号：P631.3[天文地球—地质矿产勘探]