双频激电法在西澳矿产勘查中的应用

The application of dual frequency IP method to the exploration of mineral resources in Western Australia

结合双频激电法在西澳大利亚典型覆盖区(热带稀树草原覆盖区)的应用实践,讨论了在特殊地质景观条件下,双频激电法在工作设计中装置选择、工作频率选择、接地电阻改善、电磁耦合克服等方面遇到的问题以及解决这些问题所提出的技术方法,总结整理了一些具有代表性的工作准则和野外工作经验。结论表明:双频激电法在澳洲某金矿的特殊地理环境下的应用效果良好,圈定的激电异常符合地质预期,有进行工程验证的必要;使用双频激电法,在设计及施工过程中应综合分析各方面的影响因素,科学决策,并对可能影响测量数据准确性的因素采取有效的措施,这样才能充分发挥其技术优势,取得令人满意的成果。

This paper briefly describes the principle and characteristics of the dual frequency induced polarization method on the basis of the application in typical overburden area（ savanna area coverage） of Western Australia,and discusses such aspects as to how to solve the problems met in work plan design,array selection,selection of working frequency,and conductivity improvement,and how to overcome inductively coupled problems under the special geological landscape condition. What is more,the authors give the solutions of these problems and make a summary of some work principles of universal value. In conclusion,the dual frequency induced polarization method has good application effect in the special environment of a gold mine in Australia,the delineation of the IP anomalies is consistent with the expectation of geologists,and engineering verification is necessary for further work. It is held that the dual-frequency IP method in the process of design and field construction in overseas mineral exploration work should be based on the comprehensive analysis of the influencing factors in various aspects as well as scientific decision-making,and effective measures should be adopted to eliminate the possible factors affecting the accuracy of the measurement data. Only in this way can we enjoy the full play of the technical advantages of the dua-frequency IP method and obtain satisfactory results.