浅谈2.5D磁法反演估算铁矿资源量的多解性

Discussion About Multiplicity Of Estimation On Ironore Resource With 2.5D Magnetic Method Inversion

摘要:

2.5D磁法反演估算铁矿资源量，关键是在垂直磁异常走向上求拟合模型的截面积。该文利用一种常见模型拟合4种实测磁场，发现铁矿截面积与埋深和磁性大小有一定的规律：磁化强度一定时，截面积与埋深呈线性正相关；埋深一定时，截面积与磁化强度呈近似指数形式的反相关。固定深部或外围磁性体参数，单独考虑浅部或中间铁矿模型时也有这种规律。在无钻孔资料及磁性资料不清楚时，磁化强度100000×10[CD*2]3~150000×10[CD*2]3A/m为估算铁矿资源量的最佳磁参数。因磁法反演的多解性，此类方法适用于钻孔验证前的资源量估计。

Abstract:

2.5 D inversion of magnetic method estimate ironore resources，the key is the model’s sectional area in the vertical towards of magnetic anomaly. This paper using a common model to simulate four measured magnetic field，found ironore’s sectional area and buried depth and magnetic size have certain laws: when magnetized strength is certain，sectional area and buried depth have linear positive correlation，when Buried depth is certain，sectional area and magnetic size have inverse correlation of exponentially forms.Fixed deep or peripheral magnetic model’s parameters，when considering only shallow or intermediate ironore model also have this laws. Without the borehole data and magnetic data is not clear，the scope that is 100，000 between 150，000 (103A/m) is the best magnetic parameter for estimation on ironore esources. Because the multiplicity on Magnetic Method Inversion，this method apply to resource’s estimation before validation of borehole.