地震作用下横断层地质金属成矿带电法找矿成果研究

深部矿产资源勘探是未来勘探的必然趋势.地震作用下的横断层地质构造对金属矿、 能源矿等矿产资源的分布具有重要影响,拥有较大的找矿潜力.对于地震作用下横断层地质等条件复杂的场合,采用高密度电阻率法、 激发极化法和可控源音频大地电磁法等单一电法勘探可能存在找矿效果不佳的问题,有必要研究更为有效的找矿技术方法.首先阐述了激发极化法、CSAMT法等电法勘探的基本内容和各自优缺点;然后,在分析地震作用下横断层地质特征的基础上,研究并提出了基于激发极化法和CSAMT的综合找矿法.基于激发极化法和CSAMT的综合找矿法能有效反映地下地电差异,在大深度范围有效反应地电断面电阻、 极化率参数,互相校正验证;结合已有地质物探资料,推断地下异常,提高横断层的金属矿产勘探效率和效果.将本文的研究成果应用于某横断层地质区域的金属矿勘探实践,取得了良好的勘探效果.实践表明本文所提方法有效、 可行.

Prospecting Results of Transverse Fault Geological Metallogenic Belt with Electric Method under Earthquake Action

Deep mineral resources exploration is the inevitable trend of future exploration.The transverse fault geological structure under earthquake has an important influence on the distribution of mineral resources as metal deposits and energy deposits,and is of great prospecting potential.For fields of complex geological conditions,such as transverse fault under seismic action,single electrical prospecting methods like high density resistivity method,induced polarization method and controllable source audio-frequency magnetotelluric method may have poor prospecting effect,so it is necessary to study more effective prospecting techniques.At first,the basic contents,advantages and disadvantages of induced polarization method and CSAMT method are expounded respectively.Then,based on the analysis of the geological characteristics of transverse fault under seismic action,a comprehensive prospecting method based on induced polarization method and CSAMT method is proposed.The comprehensive prospecting method based on induced polarization method and CSAMT can effectively reflect the difference of underground geoelectricity,the resistivity and polarizability parameters of the geoelectric section in a wide range of depths,and mutually correct and verify them.Combined with the existing geological and geophysical data,the underground anomalies can be inferred to improve the efficiency and effectiveness of the exploration of metal minerals in transverse faults.The results of this study have been applied to the exploration practice of metal deposits in a transverse fault geological area,and good exploration results have been achieved.Practice shows that the method proposed in this paper is effective and feasible.