Study of intrinsic versus scattering attenuation of seismic waves from borehole measurements
- Anastasia Pirogova (Curtin University) | Boris Gurevich (Curtin University; CSIRO) | Roman Pevzner (Curtin University) | Sergey Vlasov (Santos)
- Document ID
- Society of Exploration Geophysicists
- 2018 SEG International Exposition and Annual Meeting, 14-19 October, Anaheim, California, USA
- Publication Date
- Document Type
- Conference Paper
- 2018. Society of Exploration Geophysicists
- Attenuation, Inversion, Vertical seismic profile (VSP)
- 1 in the last 30 days
- 12 since 2007
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Estimation of scattering and intrinsic attenuation factors from seismic observations is of interest for subsurface imaging and characterization. We discuss a waveform inversion (WI) method for zero-offset seismic borehole data that explicitly models interference and multiple scattering in layered media using well logs. On the synthetic example, we show capability of WI to discriminate between scattering and intrinsic Q in 1D vertically inhomogeneous media. Depending on the scale of the supplied logs, the inverted Q-factors correspond either to the ‘effective’ attenuation or solely to the intrinsic absorption in rocks. We apply the WI to the nearly zero-offset VSP dataset acquired in the Nephrite-8 well (Cooper Basin, Australia). The borehole intersects the Patchawarra formation characterized by high-contrast interlayering of coal seams. For this formation, estimated intrinsic attenuation 1/Qint ≈ 0.014 is negligible compared to the stratigraphic filtering 1/Qscat ≈ 0.121±0.02. These 1/Qscat estimates are somewhat higher than those obtained by the application of the generalized O’Doherty - Anstey theory.
Presentation Date: Wednesday, October 17, 2018
Start Time: 8:30:00 AM
Location: 212A (Anaheim Convention Center)
Presentation Type: Oral
|File Size||1 MB||Number of Pages||5|
Amundsen,L., andR.Mittet,1994,Estimation of phase velocities and Q-factors from zero-offset, vertical seismic profile data:Geophysics,59,500–517,10.1190/1.1443612.
Ganley,D. C.,1981,A method for calculating synthetic seismograms which include the effects of absorption and dispersion:Geophysics,46,1100–1107,10.1190/1.1441250.
Kang Ik,B., andA.McMechan George,1994,Separation of intrinsic and scattering Q based on frequency-dependent amplitude ratios of transmitted waves:Journal of Geophysical Research: Solid Earth,99,23875–23885,10.1029/94JB02472.
Klimentos,T.,1995,Attenuation of P- and S- waves as a method of distinguishing gas and condensate from oil and water:Geophysics,60,447–458,10.1190/1.1443782.
Mangriotis,M. D.,J. W.Rector,E. F.Herkenhoff, andJ. C.Neu,2013,Scattering versus intrinsic attenuation in the vadose zone: A VSP experiment:Geophysics,78,no.2,B49–B63,10.1190/geo2012-0174.1.
Müller,T. M., andS. A.Shapiro,2004,Scattering attenuation in randomly layered structures with finite lateral extent: A hybrid Q model:Geophysics,69,1530–1534,10.1190/1.1836826.
Newman,P.,1973,Divergence effects in a layered earth:Geophysics,38,481–488,10.1190/1.1440353.
O’Doherty,R. F., andN. A.Anstey,1971,Reflections on amplitudes:Geophysical Prospecting,19,430–458,10.1111/j.1365-2478.1971.tb00610.x.
Pevzner,R.,B.Gurevich,K.Tertyshnikov,A.Bona, andS.Vlasov,2016,Scattering Attenuation from the Coal Seams (Cooper Basin, Australia):Presented at the 78th Annual International Conference and Exhibition, EAGE,Extended Abstracts,10.3997/2214-4609.201600866.
Pirogova,A.,R.Pevzner,B.Gurevich, andS.Vlasov,2018,Effect of finely-layered stiff carbonates on a seismic response. Northern Carnarvon basin synthetic study:ASEG Extended Abstracts,1–6,10.1071/aseg2018abp087.
Reine,C.,M.van der Baan, andR.Clark,2009,The robustness of seismic attenuation measurements using fixed- and variable-window time-frequency transforms:Geophysics,74,no.2,WA123–WA135,10.1190/1.3043726.
Shapiro,S. A.,H.Zien, andP.Hubral,1994,A generalized O’Doherty-Anstey formula for waves in finely layered media:Geophysics,59,1750–1762,10.1190/1.1443562.
Tonn,R.,1991,The determination of the seismic quality factor-Q from Vsp data—A comparison of different computational methods:Geophysical Prospecting,39,1–27,10.1111/j.1365-2478.1991.tb00298.x.
Wu,R.-S., andK.Aki,1988,Multiple scattering and energy transfer of seismic waves—Separation of scattering effect from intrinsic attenuation II. Application of the theory to Hindu Kush region:Pure and Applied Geophysics,128,49–80,10.1007/BF01772590.