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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。
In recent years, the three-dimensional gravity inversion method has become the focus of field inversion research. The time and efficiency of gravity inversion are heavily dependent on the number of physical subdivision units in the target area. To obtain a fine inversion result, it is necessary to search for a wider solution space. The amount of computation that increases with the number of split cells tends to increase exponentially. Based on the frequency characteristics of formation density distribution, this paper proposes a new inversion method that uses the combination of frequency distributions of the physical properties of the sub-layer to describe the physical distribution of each layer, and uses fewer frequency combinations instead of each unit Therefore, the overall continuity of the inversion results is better. The results show that the inversion results of this method are more conducive to geological interpretation, and can greatly reduce the computational complexity of back-search, and save computation time.