A time domain induced polarization relaxation time spectrum inversion method based on a damping factor and residual correction

Relaxation time spectra （RTS） derived from time domain induced polarization data （TDIP） are helpful to assess oil reservoir pore structures. However, due to the sensitivity to the signal-to-noise ratio （SNR）, the inversion accuracy of the traditional singular value decomposition （SVD） inversion meth...

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Bibliographic Details
Published in:Petroleum science 2014-12, Vol.11 (4), p.519-525
Main Authors: Liu, Xiaonan, Kong, Li, Zhou, Kaibo, Zhang, Pu
Format: Article
Language:English
Subjects:
Accuracy
Damping
Earth and Environmental Science
Earth Sciences
Economics and Management
Energy Policy
Induced polarization
Industrial and Production Engineering
Industrial Chemistry/Chemical Engineering
Inversions
Mathematical models
Mineral Resources
Relaxation time
Robustness
SVD方法
Time domain
反演方法
弛豫时间谱
时域
校正
激发极化
系数和
阻尼
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Summary:Relaxation time spectra （RTS） derived from time domain induced polarization data （TDIP） are helpful to assess oil reservoir pore structures. However, due to the sensitivity to the signal-to-noise ratio （SNR）, the inversion accuracy of the traditional singular value decomposition （SVD） inversion method reduces with a decrease of SNR. In order to enhance the inversion accuracy and improve robustness of the inversion method to the SNR, an improved inversion method, based on damping factor and spectrum component residual correction, is proposed in this study. The numerical inversion results show that the oscillation of the RTS derived from the SVD method increased with a decrease of SNR, which makes it impossible to get accurate inversion components. However, the SNR has little influence on inversion components of the improved method, and the RTS has high inversion accuracy and robustness. Moreover, RTS derived from core sample data is basically in accord with the pore-size distribution curve, and the RTS derived from the actual induced polarization logging data is smooth and continuous, which indicates that the improved method is practicable.
ISSN:1672-5107
1995-8226
DOI:10.1007/s12182-014-0367-9