Abstract
The three ‐ dimensional(3D)inversion of gravity/magnetic anomalies plays an important role in constructing the 3D fine structure of underground space. However,the matrix of the kernel function in 3D inversion is large,and it requires huge computer memory,which limits its wide application. In order to reduce the memory required by the kernel function,a 3D inversion method of gravity/magnetic anomalies based on curvelet compression is proposed in this paper. In other words,through curvelet transform,the energy of the kernel matrix is mainly retained in a small part of sparse curvelet coefficients,which can achieve efficient compression inversion. Compared with wavelet transform,curvelet transform has superior signal sparse representation ability,so it can obtain higher compression accuracy under the same compression rate. In this paper,the application effects of wavelet compression and curvelet compression in the 3D inversion of gravity/magnetic anomalies are compared. Under the same calculation accuracy,curvelet compression can improve the kernel compression rate by 100% and reduce the memory requirement by 50%. In the model test,the kernel function has a size of(100 × 100)×(100 × 100 × 50),with a storage capacity of 37 GB in double precision,and the proposed method adopting a compression ratio of 4%(the kernel’s memory is only 1. 48 GB)obtains the inversion results similar to the wavelet compression adopting a compression ratio of 10%. The proposed method is applied to the 3D inversion of magnetic anomalies in the Galinge mining area in western China,in which the 3D magnetization model obtained from compression and inversion reveals the buried depth,spatial distribution,and magnetic strength of the ore body,which provides a reliable basis for later drilling verification,reserve evaluation,and concealed ore detection.
Translated title of the contribution | Three‑dimensional inversion of gravity/magnetic anomalies based on curvelet compression and its applications |
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Original language | Chinese (Traditional) |
Pages (from-to) | 993-1001 |
Number of pages | 9 |
Journal | Shiyou Diqiu Wuli Kantan/Oil Geophysical Prospecting |
Volume | 58 |
Issue number | 4 |
DOIs | |
State | Published - Aug 2023 |
Keywords
- 3D inversion
- compression
- curvelet transform
- gravity anomaly
- magnetic anomaly