钻孔测井资料在深部找矿预测中的应用——以福建梅仙镇峰岩—谢坑矿区找矿应用为例

The thinking about applying borehole logging data to deep ore-prospecting prediction

深部找矿一直以来难度较大且缺乏有效的手段,金属矿测井作为找矿手段已应用多年,但其深部找矿应用尚在探索中,效果也有待于评价。本文以福建省尤溪县梅仙镇峰岩—谢坑矿区钻孔测井资料为研究对象,解剖了三分量磁测、电阻率测井和激电测井等方法在该区深部找矿中的应用。通过对比钻孔取芯观察分析,对矿化段识别效果和多种测井响应特征进行了综合分析,认为在本区的几种测井方法中,电阻率测井对铅锌矿的识别效果稍好,磁测对部分矿体品位高的铅锌矿的识别井段有好的显示;总体上两种测井方法都分别有一定的显示效果,但对深部的钼矿井段显示都不好,也不存在对应关系。综合分析测井在该区深部找矿中的应用,认为要做好深部找矿应首先分析好测井应用条件是否合适,在矿产勘查过程中运用更为有效的测井手段探测与矿化的对应关系,有助于减少区域找矿工作的盲目性,适合条件的钻孔测井方法在发现和预测深部矿体,确定矿体产状,圈定矿体规模,指示矿体空间位置等方面可以起到一定的辅助作用,提升找矿成功率。

Deep prospecting has always been difficult and ineffective. Logging as an important means of prospecting for metal ores has been used for many years,but its deep prospecting application is still in the exploration stage,and its effect also needs evaluation. In this paper,the authors took the mining borehole log data from the Fengyan-Xiekeng ore district of Meixian Town in Youxi County of Fujian Province as the research object by analysis of the tri-component magnetic survey,resistivity logging,and IP logging method application effect of deep prospecting in this area. Through the comparison of core observation and analysis,the identification effect of mineralization section and various logging response characteristics were analyzed comprehensively. It is thought that among several logging methods,the resistivity logging is relatively effective in search for lead-zinc deposits,whereas magnetic survey is effective for lead-zinc ore block with high ore grade. On the whole,the two kinds of logging methods are respectively effective to a certain extent,but their effects in search for deep molybdenum ares are not ideal,with no corresponding relationship. Based on a comprehensive analysis of the logging application for deep ore prospecting in this area,the authors hold that,for deep prospecting,researchers should analyze well logging application conditions. In the process of mineral exploration,a more effective means of logging detection should be used to find the corresponding relationship with mineralization,which can help reduce the blindness of regional prospecting work.In the borehole suitable for the exploration conditions,well logging is somewhat effective in the detection and prediction of deep orebody,determination of the attitude and the size of the orebody and locating of its spatial location. Generally,the logging method can play a supplementary role and can improve prospecting success rate.