Wave equation tomographic velocity inversion method based on the Born/Rytov approximation |
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| Authors: | Zhang Kai Yin Zheng Li Zhen-Chun Chen Yong-Rui |
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| Institution: | School of Geosciences, China University of Petroleum, Qingdao, China, 266580 |
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| Abstract: | This paper discusses Born/Rytov approximation tomographic velocity inversion methods constrained by the Fresnel zone. Calculations of the sensitivity kernel function and traveltime residuals are critical in tomographic velocity inversion. Based on the Born/Rytov approximation of the frequency-domain wave equation, we derive the traveltime sensitivity kernels of the wave equation on the band-limited wave field and simultaneously obtain the traveltime residuals based on the Rytov approximation. In contrast to single-ray tomography, the modified velocity inversion method improves the inversion stability. Tests of the near-surface velocity model and field data prove that the proposed method has higher accuracy and Computational efficiency than ray theory tomography and full waveform inversion methods. |
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| Keywords: | Tomographic inversion Fresnel zone sensitivity kernels Born approximation Rytov approximation |
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