空间域变深度视磁化强度迭代反演

ITERATIVE VARIABLE-DEPTH INVERSION FOR PSEUDO-MAGNETIZABILITY IN SPACE DOMAIN

地矿部石油物探研究所,南京210014

Research Institute of Geophysical Prospecting for Petroleum, MGMR, Nanjing 210014

岩石的视磁化强度反演是地球物理中岩性研究的重要组成部分。在视磁化强度反演的空间域矩阵法的基础上,本文提出了视磁化强度的空间城变深度迭代反演方法。方法中利用了流动窗口技术,并引入了消除磁性界面起伏校正因子α,导出了实用的起伏校正公式:J′=J·[1+α·(h-Ⅱ)/Ⅱ]。最后运用迭代的方法获得了高精度的反演结果。理论模型试算与辽东湾地区实际资料处理均取得了满意的效果,证明了方法的正确性和有效性。本文提出的及演方法可完全应用于重力资料的视密率及演。

The inversion for rock's pseudo-magnetizability is an important stage in geophysical lithologic study. Based on the pseudo-magnetizability matrix inversion method in space domain,an iterative variable depth inversion for pseudo-magnetizability using sliding window technique is suggested here. The introduction of a correction facter a gives rise to a practical formula for correcting magnetic boundary's fluctuation as: J′=J·[1+α·(h-Ⅱ)/Ⅱ]. High accuracy inversion results were achieved as a result of applying the method in an iterative way. Both the trial on a theoretical model and a set of real data in the Liao Dong Wan area have confirmed the method's correctiness and effectiveness with satisfactore results. This method is applicable to gravity data for pseudo-density as well.