重力异常曲化平的改进插值—迭代法  

A modified interpolation-iteration method for gravity anomaly continuation from undulating surface to plane

作　　者：杨婧 郭良辉[1] YANG Jing;GUO Liang-Hui(School of Geophysics and Information Technology,China University of Geosciences,Beijing 100083,China)

机构地区：[1]中国地质大学(北京)地球物理与信息技术学院,北京100083

出　　处：《物探与化探》2022年第1期123-129,共7页Geophysical and Geochemical Exploration

基　　金：国家重点研发计划项目“月球内部圈层结构与演化过程的研究”(2021YFA0715101);国家自然科学基金面上项目“全波形与重力联合反演方法及在南岭—武夷—东南沿海成矿带岩石圈三维精细结构成像的应用”(41974101);中央高校基本科研业务费专项资金;地质过程与矿产资源国家重点实验室科技部专项经费。

摘　　要：重力异常曲化平即将起伏观测面上的重力异常延拓到平面上,从而为频率域处理和反演提供平坦观测面的重力异常数据。本文在常规插值—迭代法基础上,给出重力异常曲化平的改进插值—迭代法,即在异常迭代修正过程中引入起伏观测面修正因子,加快曲化平迭代收敛,促进曲化平效果提升。理论模型试验表明本文方法适用于观测面起伏较大、延拓跨度大的复杂条件下的稳定、有效曲化平,效果优于常规插值—迭代法。川滇地区实际重力异常数据试验表明本文曲化平方法有效增强了异常信号和细节特征,为后续处理和解释提供可靠数据。Gravity anomaly continuation from undulating surface to plane can provide gravity data on a flat horizontal plane for frequency-domain data processing and inversion.Based on the theory of conventional interpolation-iteration methods,this study proposed a modified interpolation-iteration method by introducing a correction factor of the undulating observation surface in the iteration and correction process.The improved method accelerated the iterative convergence speed and promoted the continuation effects.The theoretical model-based tests show that this method can be used to achieve stable and effective large-span gravity anomaly continuation from greatly undulating surface to plane.The continuation results presented by this method are better than those obtained using conventional interpolation-iteration methods.The application of Bouguer gravity anomaly data of the Sichuan-Yunnan region demonstrates that the modified interpolation-iteration method effectively enhanced anomalous signals and details and can provide reliable data for subsequent processing and interpretation.

关 键 词：曲化平 重力异常 插值—迭代法 川滇地区 

分 类 号：P631[天文地球—地质矿产勘探]