Salt and subsalt structure recovery — An envelope-based waveform inversion with local angle domain illumination compensation and L-BFGS
| Autor: | Jingrui Luo, Huamin Zhou, Ru-Shan Wu, Xingguo Huang |
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| Rok vydání: | 2023 |
| Předmět: | |
| Zdroj: | GEOPHYSICS. :1-88 |
| ISSN: | 1942-2156 0016-8033 |
| DOI: | 10.1190/geo2022-0550.1 |
| Popis: | Correct subsalt structure recovery is important for subsalt reservoirs exploration. However, high precision subsalt structure retrieving using full waveform inversion (FWI) is not easy caused by the shielding from salt body and the depth of the target. In order to get correct subsalt structures, techniques which can effectively work with deep targets are desired. Besides, correct recovery of the salt body is critical for the recovery of subsalt structure. However, the salt body recovery itself is also challenging in FWI, especially when a reasonable starting model is not available. In this work, we consider both the recovery of the salt structure and subsalt structure. A local angle domain illumination compensated direct envelope inversion with local resolution function is proposed to provide large-scale background salt structure with enhanced and more balanced recovery of the salt body in deep part. Then FWI with angle domain illumination compensation is used to improve the recovery for both the salt and subsalt structures. To further enhance the quality of the inversion, model updating with L-BFGS is embed into the whole process. Numerical examples with the SEG/EAGE salt model and the Sigsbee model demonstrated that the proposed method can retrieve the salt structure as well as the subsalt structure effectively with high precision starting from a linear starting model. |
| Databáze: | OpenAIRE |
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