磁测资料预处理中梯度改正问题探讨

Probe into the Gradient Correction in Pre-processing of Magnetic Data

在地质矿产调查、地球物理勘探中,高精度磁测以经济、实用、快捷等特点,在寻找铁磁类矿物及构造中被广泛应用,但在磁测工作中,资料预处理正常场梯度改正比较繁琐,误差又比较大,笔者通过论述和实列对比,指出了目前磁测规范中正常场梯度改正存在的问题,并对正常场梯度改正方法进行了一定的探讨,提出了精度较高的正常场梯度改正方法,同时还提出了一种快捷的磁异常计算方法,使得磁测资料预处理更加简便、准确。

In geology and mineral resources survey and geophysical exploration,high-precision magnetic measurement is characterized by economic,practical,and fast,so it find a wide application in searching for ferromagnetic minerals and geological structures.However,in data pre-processing,the correction of normal field gradient is relatively complicated and has a big error.Through comparison between practical examples,we point out the problem exists in current norms of normal magnetic field gradient measurements to correct the problems,discuss the correction of the normal field gradient method,and propose a new method for the correction.In addition,we also put forward a calculating method which is fast in calculation,making the pre-processing of magnetic measurement data become more simple and accurate.