摘要
含石墨地层能形成天然的电场低阻地质体,其找矿标志较为明显。以四川庙坪石墨矿为例,将自然电场法、可控源音频大地电磁测深法(Controlled source audio-frequency magnetotelluric method,CSAMT)与自然电位测井相结合进行了综合勘探,通过各方法的相互验证、相互补充,大致确定了区内矿体的形态、规模及深部延伸情况。研究表明:(1)矿区具有视电阻率值较低、自然电位异常强度较高的异常特征,石墨矿与围岩有明显的自然电位差异,高强度自然电位异常可较好地反映矿体分布,尤其是当岩芯采取率较低时,矿体的顶、底边界及分布特征可由自然电位曲线形态确定;(2)自然电位异常强度较高、视电阻率低的异常特征是对矿区进行物探勘查的前提条件,自然电场法、可控源音频大地电磁测深、自然电位测井组合为该矿深部勘查的有效物探方法。
The graphite formation can form a natural electric field with low resistivity geological body,its prospecting indicators are obvious. Taking the Miaoping graphite deposit in Sichuan Province as the study example,the comprehensive geophysical prospecting methods based on natural electric field method,controlled source audio-frequency magnetotelluric method（ CSAMT） and natural potential logging method are used to conduct the deep prospecting work of the mining area. The shape,size and deep extension features of the deposits in the mining area are basically known by the comprehensive interpretation of the geopyhsical prospecting data. The study results show that：（1）the mining area is characterized by low apparent resistivity and high natural potential anomaly intensity,natural potential different between graphite ore-body and its surrounding rock is significant,the distribution of graphite ore-body can be reflected by high intensity of natural potential anomaly,especially for the low core collection rate,the distribution of graphite ore-body and its boundary of roof and floor can be determined by the shape of natural potential curve;（2）the geophysical prospecting work can be done in the mining area should be under the conditions of high intensity natural potential anomaly and low apparent resistivity,the effectively deep comprehensively geophysical prospecting combination of the mining area can be consist of natural electric field,controlled source audio-frequency magnetotelluric method（ CSAMT） and natural potential logging method.
出处
《现代矿业》
CAS
2018年第1期111-116,共6页
Modern Mining
关键词
石墨矿
综合物探法
自然电场法
可控源音频大地电磁测深
自然电位测井
深部找矿
Graphite deposit, Comprehensive geophysical prospecting method, Natural electric fieldmethod, Controlled source audio-frequency magnetotelluric method, Natural potential logging method, Deepprospecting
