Layer anisotropic elastic parameters inversion based on Fourier coefficients of azimuthally elastic impedance
- Lin Li (China University of Petroleum (East China)) | Guangzhi Zhang (China University of Petroleum (East China)) | Xinpeng Pan (China University of Petroleum (East China)) | Qicui Tu (Shanghai Branch of CNOOC,Ltd.) | Jiang Liu (Shanghai Branch of CNOOC,Ltd.)
- Document ID
- Society of Exploration Geophysicists
- SEG International Exposition and Annual Meeting, 15-20 September, San Antonio, Texas, USA
- Publication Date
- Document Type
- Conference Paper
- 2019. Society of Exploration Geophysicists
- Wide azimuth (WAZ), Inversion, Fractures, Anisotropy, Fourier
- 2 in the last 30 days
- 2 since 2007
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In this paper, the Fourier Coefficients (FCs) expression of azimuthally anisotropic elastic impedance (EI) equation is derived, a three-step workflow is proposed to simultaneously estimate P-wave impedance, S-wave impedance and fracture weaknesses parameters. The first step of the workflow is using the stacked seismic data to separately predict the small, middle, and large incidence angle EI data sets at each azimuth, after which we extract the FCs from all the predicted results of azimuthally anisotropic EI. Finally, the nonlinear iteratively reweighted least squares (IRLS) algorithm is implemented to simultaneously estimate P-wave impedance, S-wave impedance and fracture weaknesses parameters from all the extracted results of FCs. Tests on synthetic data show that inversion results are still estimated reasonably with moderate noise. A test on real data shows that the estimated results are in good agreement with the drilling.
Presentation Date: Monday, September 16, 2019
Session Start Time: 1:50 PM
Presentation Time: 2:15 PM
Presentation Type: Oral
|File Size||3 MB||Number of Pages||5|
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