危机矿山重磁资料精细处理与解释:以湖北省大冶铁矿为例

Application of Fine Gravity and Magnetic Data Processing and Interpretation in the Prospecting of Crisis Mines

针对湖北大冶矿区复杂的地质问题,基于高精度重磁实测数据,采用三维重磁数据概率分析和物性反演技术,实现了大冶矿区重磁资料的精细化处理与解释,为大冶危机矿山深部及外围找矿提供了重要的参考.在无约束条件下对高磁异常源进行了三维概率成像反演,并结合地质先验信息完成了矿区航磁异常的带地形人机交互三维反演,预测了矿区沉积岩类与闪长岩体接触带的空间延展形态,定量反演了矿区的三维物性特征,反演结果显示在矿区深部(1000m以下)及接触带弯折部位为有利的找矿区域,目前通过实钻已得到证实.

Aimed at solving the complicated geological problem of Daye iron deposit in Hubei Province, this paper applies the techniques of probability analysis and physical property inversion to realize fine processing and interpreting of high-precision 3D gravity and magnetic data in the Daye iron deposit, and proposes a significant reference for the prospecting in the deep and surrounding of mines. We inverted the strong aeromagnetic anomaly with 3D probability tomography under no-constraints, completed 3D magnetic interactive inversion with the help of topography and other prior geological information, and forecasted the space extended state for the contact zone of sedimentary rock and diorite in the mining areas. Then we inverted 3D physical property characters within a fixed quantity in the areas. The inverse results show that the significant prospecting zones are distributed in the deep （under 1 000m） and the flexures of the contact zones in the mining areas. These predicted zones had been proved by the practical logging.