依据密度分布频率特性的重力反演方法研究(英文)

Gravity inversion using the frequency characteristics of the density distribution

近年来,三维重力反演方法成为位场反演研究的热点。重力反演的时间和效率严重依赖于目标区物性剖分单元的数目,要得到精细的反演结果就必然要搜索范围更广的解空间。随剖分单元增多而增加的计算量往往是呈指数递增的。本文从地层密度分布的频率特征出发,提出一种新的反演思路,即利用剖分层的物性分布频率特征组合来描述每层的物性分布特点,用较少的频率组合代替每个单元的物性结果,因此,反演结果的整体连续性更好。研究结果表明,该方法的反演结果更加有利于地质解释,并且可以大大减少反演搜索的计算量、节省计算时间。

Three-dimensional gravity inversion based on the mass property model is very popular in recent years. The time and efficiency of inversion algorithms is relative to the magnitude of the target mesh. One approach is to search over the entire solution space for a more refined result. However, the inversion will be difficult with the increased parameters in the large search space and the number of computations increases exponentially. ｜n this paper, we propose a novel approach based on the frequency characteristics of the density distribution over the mesh. The purposes of our study are to reduce the parameters of three- dimensional gravity inversion and to lighten the image quality of the inversion result. The results show that the new method can expedite the inversion processing and get a better geological interpretation than tradition methods.