A robust 3D acoustic full waveform inversion strategy for Malaysian basins
- Kefeng Xin (PETRONAS Research Sdn Bhd) | Farah Syazana Dzulkefli (PETRONAS Research Sdn Bhd) | Ahmad Riza Ghazali (PETRONAS Research Sdn Bhd) | Muhammad Sajid (PETRONAS Research Sdn Bhd) | Chin Tee Ang (PETRONAS Research Sdn Bhd) | M Anwar Ishak (PETRONAS Research Sdn Bhd)
- 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
- Full-waveform inversion, Asia, 3D, Acoustic, Imaging
- 2 in the last 30 days
- 2 since 2007
- Show more detail
A 3D Full Waveform Inversion (FWI) strategy for offshore Malaysian basins is developed, which aims to obtain accurate velocity models by minimizing the difference between observed and modelled seismic data. The acoustic wavefield simulation during FWI is based on a pseudo-analytical method. We propose a new solution to automatically detect the cycle-skipping by analyzing the notch frequency of the difference between the observed and simulated shot gathers, and then remove the cycle skipped energy by modifying the adjoint source with a low pass filter. We tested the approach on 2.5D Marmousi dataset and then applied to offshore seismic datasets from Malaysia. Our FWI results have revealed detailed velocity features such as faults and thin layers. By applying the updated velocity into RTM, the quality of the resulting images have improved significantly.
Presentation Date: Monday, September 16, 2019
Session Start Time: 1:50 PM
Presentation Time: 4:20 PM
Presentation Type: Oral
|File Size||673 KB||Number of Pages||5|
Alkhalifah,T.,2016,Full model wavenumber inversion (FMWI): an emphasize on the appropriate wavenumber continuation:Geophysics,81,no.3,R89–R98, doi:10.1190/geo2015-0537.1.
Chapman,C. H., andR. G.Pratt,1992,Traveltime tomography in anisotropic media: theory:Geophysical Journal International,109,1–19, doi:10.1111/j.1365-246X.1992.tb00075.x.
Choi,Y., andT.Alkhalifah,2012,Source-independent time-domain waveform inversion using convolved wavefields: Application to the encoded multi-source waveform inversion:Geophysics,76,no.5,R125–R134, doi:10.1190/geo2010-0210.1.
Etgen,J. T., andS.Brandsberg-Dahl,2009,The pseudo-analytical method: Application of pseudo-laplacians to acoustic and acoustic anisotropic wave propagation:79th Annual International Meeting, SEG,Expanded Abstracts,2552–2556, doi:10.1190/1.3255375.
Ghazali,A. R.,N.ElKady,M. F.Abd Rahim,R. J. J.Hardy,F. S.Dzukelfi,S.Chandola,S.Kumar,S.Shukri,S. M. T.Mohi Eldin,S. S.Elkudry,N. L.Rafiuddin,S.Maitra,F. F.Basir,M. L.Ghazali,M. H. F.Abdul Latib, andS.Zainal,2018,Reservoir delineation beneath a heterogeneous shallow gas overburden using ‘True-3D’ seismic imaging approaches:First Break,36,119–196.
Plessix,R. E.,2006,A review of the adjoint-state method for computing the gradient of a functional with geophysical applications:Geophysical Journal International,167,495–503, doi:10.1111/j.1365-246X.2006.02978.x.
Pratt,R. G.,C.Shin, andG.Hick,1998,Gauss–Newton and full Newton methods in frequency–space seismic waveform inversion:Geophysical Journal International,133,341–362, doi:10.1046/j.1365-246X.1998.00498.x.
Reshef,M.,D.Kosloff,M.Edwards, andC.Hsiung,1988,Threedimensional elastic modeling by the Fourier method:Geophysics,53,1184–1193, doi:10.1190/1.1442558.
Tarantola,A.,1984,Inversion of seismic reflection data in the acoustic approximation:Geophysics,49,1259–1266, doi:10.1190/1.1441754.
Virieux,J., andS.Operto,2009,An overview of full-waveform inversion in exploration geophysics:Geophysics,74,no.6,WCC1–WCC26, doi:10.1190/1.3238367.