激发极化法在新疆奇台县岩浆岩型石墨矿中的应用

Application of Induced Polarization Method in Magmatic Graphite Deposit of Qitai County, Xinjiang

石墨矿相对于围岩物性特征更加独特,主要呈低阻高极化特征。依据石墨的独特物性条件,奇台黄羊山岩浆岩型石墨矿与围岩明显的物性差异,对黄羊山一带石墨矿勘查布设了激发极化法物探测量方法,通过与地质、槽探、钻探等方法的相互验证、补充,取得了重大勘探成果,突破了亿吨级资源储量类别。激发极化法在黄羊山石墨矿勘查边界圈定及深部资源推断中得到了很好的应用。通过对奇台黄羊山石墨矿激电测量的应用与研究,在大面积、埋藏较深的石墨矿勘查中,运用时间域激电及等距对称四极测深装置测得的视极化率(ηs)、通过反演计算取得的视电阻率(ρs)等主要参数,结合石墨矿体的实际产状确定矿体空间位置,以此准确判定矿体分布范围,为下一步地质工作、资源储量预测和工程布设指明方向。

Graphite is more unique than surrounding rock in physical properties,mainly characterized by low resistance and high polarization.According to the unique physical properties of graphite,the obvious physical properties difference between magmatic rock type graphite deposit and surrounding rock in Qitai Huangyangshan area,the induced polariza- tion geophysical prospecting method has been laid out for the exploration of Graphite Deposit in Huangyangshan area. Through mutual verification and supplement with geological,trench and drilling methods,significant exploration results have been achieved,breaking through the category of 100 million tons of resources reserves and breaking through the na- tional stone prospecting method.The distribution pattern of ink resource reserves and induced polarization method have been well applied in delineation of exploration boundary and inference of deep resources of Huangyangshan graphite deposit.Through the application and research of induced polarization measurement in Huangyangshan Graphite Deposit of Qitai,the main parameters of apparent polarization (ηs) measured by time domain induced polarization and isometric symmetric quadrupole sounding device and apparent resistivity (ρs) obtained by inversion calculation are used in large- scale and deep-buried graphite exploration, and the spatial position of the ore body is determined by combining the actu- al occurrence of the graphite ore body,so as to determine the ore body accurately.The distribution range of ore bodies in- dicates the direction for further geological work,resource reserve prediction and engineering layout.