金属矿自然电位的空间分布及其应用

本文根据坑道、钻孔的自然电位观测资料及模型实验结果,提出了金属矿体自然电位空间分布的模型：自然电位空间分布具有正、负异常中心的偶极场特征,自然电流场受半空间的影响较大,矿体埋藏深度较大时形成“8”字形的电位分布,埋藏深度较小时形成似双叶双曲线形态的电位分布。自然电位空间分布的研究表明,观测金属矿床坑道、钻孔的自然电位可以揭露矿体的埋深和产状,且有可能探测钻孔和坑道附近的盲矿体。

SPATIAL DISTRIBUTION OF SPONTANEOUS POTENTIAL OF METALLIC OREBODY AND: ITS APPLICATION

Based on observations of spontaneous potential in workings and drill holes and on model tests, this paper holds that the spatial distribution of spontaneous potential in the metallic orebody has characteristic of dipole field with centre of positive anomaly and that of negative anomaly. The spontaneous electric field is largely affected by half space. Orebodies occurring at greater depth form"8"-shaped potential distribution, while those present at smaller depth give rise to a potential distribution like biparted hyperbola.A study on spatial distribution of spontaneous potential suggests that observation of spontaneous potential in workings and drill holes of metallic deposits might reveal the buried depth and occurrence mode of orebodies, and help to detect blind orebodies adjacent to drill holes and wall of workings as well.