井-地充电法圈定矿体边界异常特征研究

Study on anomalous of borehole-surface mise-a-la-masse method in delineating the ore body

采用有限单元法对井-地充电法进行了数值模拟,通过对水平、倾斜等不同形态板状矿体在不同地电条件下井-地充电法异常的计算和讨论,研究了矿体的空间分布与电位梯度分布之间规律,并提出深宽比和深峰比的概念以讨论异常形态与地下地质体间的对应关系.计算结果表明:电位梯度峰值位置和矿体边界位置有一定的对应关系,利用电位梯度等值线形态及其峰值位置可有效获得矿体走向、倾向和边界等信息.

The anomalous of borehole-surface mise-a-la-masse method of horizontal and inclined tabular body are calculated in this paper based on FEM. In borehole-surface mise-ala-masse method modeling, by changing the depth, size, thickness,charging point＇s position and electrical difference of anomalous body , some rules are found between the potential difference distribution and ore body horizontal boundary, depth-size ratio of geologic body and depth-peak ratio of the potential difference are set to research the relationship between anomalous feature and geologic body. It shows that potential difference distribution and their peaks position can be used for estimating the horizontal boundary, trend and strike of ore body.