地面及井中高精度磁测联合反演解释在铁矿勘查中的应用

四川平川烂纸厂铁矿是我国重要的峨眉山玄武岩建造型铁矿床。通过对平川地区地面高精度磁数据进行化极、向上延拓以及小波分析等处理，圈定了五个磁性体。该区磁性体受南北向断裂控制，异常沿南北向呈狭长串珠条带状分布，产状近直立，埋藏较浅，下沿深度较大。通过与井中磁异常分量Za数据联合反演，获得磁性体的深部形态特征，分析了其对应的下延深度，与现已查明矿体的空间展布相吻合。地面与井中数据联合反演提高了深部目标体分辨能力，为深部矿产资源探测提供了重要的的地球物理方法。

Application of joint inversion and interpretation of surface and borehole high-precision magnetic data to iron-ore exploration

The Lanzhichang iron-ore mine in Pingchuan, Sichuan province is an important iron deposit hosted in Emeishan basaltic. For further exploration, five magnetic bodies were delineated by processing of the ground high-precision magnetic data including reduced-to-the-pole, upward continuations and wavelet-analysis in this mine. The magnetic bodies are controlled by NS-trending faults, of which the anomalies are distributed in a narrow and long belt. The orebodies are nearly vertical, with shallow burial and large downward extension. Joint inversion of borehole magnetic data permits to reveal the shape of magnetic bodies at depth, in good consistency with the distributions of the identified ore bodies. This work demonstrates that the joint inversion and interpretation of surface and borehole magnetic data can improve the vertical resolution of magnetic survey, providing a useful tool for exploration of mineral resources in the deep subsurface.