归一化总水平导数法在位场数据解释中的应用

本文提出归一化总水平导数法,通过对总水平导数进行空间归一化计算实现了异常体水平位置和深度的估计,此外还推导出基于归一化总水平导数的欧拉反褶积法来估算地下地质体的空间位置,两种方法反演结果的相互验证可有效地提高反演结果的可信度.理论模型试验证明空间归一化总水平导数法和归一化总水平导数欧拉反褶积法均能有效地完成异常体的水平位置和深度的估计,所获得的位置参数与理论值相一致.在利用归一化总水平导数法进行磁异常解释时,对数据进行化磁极计算可得到更加准确的结果.将其应用于实际航磁数据的解释,获得了岩脉的大致分布特征.

Application of the normalized total horizontal derivative (NTHD) in the interpretation of potential field data

We propose the normalized total horizontal derivative method, which normalizes the total horizontal derivative to estimate the horizontal location and depth of the source. We also derive the Euler method based on the normalized total horizontal derivative to estimate the location of the source. The comparison of the inversion results computed by the two methods can increase the reliability of the inversion results. The theoretical tests show that the normalized total horizontal derivative method and Euler method based on normalized total horizontal derivative both can finish the computation of horizontal location and depth of the causative source effectively, and the obtained parameters are consistent with the theoretical values. In the interpretation of magnetic data, we reduce the data to the magnetic pole that can obtain more accurate results. We also apply the proposed methods to interpretation of real magnetic data and obtain the rough distribution of dykes.