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Asymptotic viscoacoustic diffraction tomography of ultrasonic laboratory data: a tool for rock properties analysis ArchiMer
Ribodetti, A; Operto, S; Virieux, J; Lambare, G; Valero, Hp; Gibert, D.
This paper presents an application of 2.5-D asymptotic viscoacoustic diffraction tomography to ultrasonic data recorded during a physically scaled laboratory experiment. This scaled experiment was used to test the reliability of our method when applied to a real data set to estimate the attenuation factor Q. Diffraction tomography relies on ray theory to compute the Green functions in a smooth background medium and on the Born approximation to linearize the relation between the scattered wavefield and the velocity and Q perturbations. The perturbations are inferred from the data by an iterative (linear) quasi-Newtonian algorithm. The inversion formula was specifically developed to account for the acquisition geometry designed in this study. The derivation...
Tipo: Text Palavras-chave: Asymptotic method; Attenuation; Diffraction tomography; Rock properties; Ultrasonic seismic data.
Ano: 2000 URL: https://archimer.ifremer.fr/doc/00466/57770/60029.pdf
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