NDLI: Acoustic impedance inversion of zero-offset VSP data

Content Provider	Springer Nature Link
Author	Wang, Jing Liu, Yang Sun, Zhe Tian, Hong Su, Hua Zhao, Qianhua Liu, Yingyu
Copyright Year	2009
Abstract	Highly precise acoustic impedance inversion is a key technology for pre-drilling prediction by VSP data. In this paper, based on the facts that VSP data has high resolution, high signal to noise ratio, and the downgoing and upgoing waves can be accurately separated, we propose a method of predicting the impedance below the borehole in front of the bit using VSP data. First, the method of nonlinear iterative inversion is adopted to invert for impedance using the VSP corridor stack. Then, by modifying the damping factor in the iteration and using the preconditioned conjugate gradient method to solve the equations, the stability and convergence of the inversion results can be enhanced. The results of theoretical models and actual data demonstrate that the method is effective for pre-drilling prediction using VSP data.
Starting Page	150
Ending Page	158
Page Count	9
File Format	PDF
ISSN	16727975
Journal	Applied Geophysics
Volume Number	6
Issue Number	2
e-ISSN	19930658
Language	English
Publisher	Chinese Geophysical Society
Publisher Date	2009-06-26
Publisher Place	Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	zero-offset VSP impedance inversion non-linear iterative inversion damping factor pre-conditioned conjugate gradient method Applied Earth Sciences Geophysics/Geodesy
Content Type	Text
Resource Type	Article
Subject	Geophysics

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Acoustic impedance inversion of zero-offset VSP data