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Effect of anisotropy on AVO

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Proceedings Papers

Paper presented at the SEG International Exposition and Annual Meeting, October 11–16, 2020
Paper Number: SEG-2020-3427877
... Based on Monti Carlo simulation using laboratory measured rock physics data, we studied the effect of seismic anisotropy on the AVO gradient B and compared it with the gas saturation effect on AVO gradient. Our study shows that the former is usually much greater than the latter, and the seismic...
Proceedings Papers

Paper presented at the 2002 SEG Annual Meeting, October 6–11, 2002
Paper Number: SEG-2002-0105
... unconsolidated sand Stress-induced anisotropy in unconsolidated sands and its effect on AVO analysis Shiyu Xu*, Subsurface Imaging Division, ExxonMobil Upstream Research Company Summary In a recent rock physics study, anomalously high Vp/Vs ratios were observed relative to expectations in unconsolidated...
Proceedings Papers

Paper presented at the 1998 SEG Annual Meeting, September 13–18, 1998
Paper Number: SEG-1998-0212
...) geometrical spreading instead of isotropic ones (lower curves). The directivity correction e ect can be seen from the slight di erence on the pairs of curves. 1998 SEG Expanded Abstracts E ects of anisotropy in the AVO analysis 0.85 0.90 0.95 1.00 1.05 1.10 1.15 0 5 10 15 20 25 30 35 40 45 N O RM AL IZ ED D...
Proceedings Papers

Paper presented at the 1995 SEG Annual Meeting, October 8–13, 1995
Paper Number: SEG-1995-0336
... to examine the influence of anisotropy and to determine which fea- tures of the geologic model have important effects on the AVO analysis. The geologic model was determined from surface seismic, log, and geologic data relating to the location of the field (North Sea). The geologic model consists of one...
Proceedings Papers

Paper presented at the 1996 SEG Annual Meeting, November 10–15, 1996
Paper Number: SEG-1996-1805
... studies like AVO analysis. The effect of velocity anisotropy is not only limited to the angular dependence of reflection coefficients but it also distorts the AVO signatures due to redistribution of energy along the wavefront of the wave travelling down to the reflector and coming up to the surface...
Proceedings Papers

Paper presented at the 1997 SEG Annual Meeting, November 2–7, 1997
Paper Number: SEG-1997-2001
... boundary and the presence of anisotropy above the reservoir have significant effects on the azimuthal AVO response. Our numerical modeling show that AVOA response is noticeable depends on the relative contribu- tions of anisotropic AVO effects induced by fractures to isotropic background AV0 response...
Proceedings Papers

Paper presented at the 1994 SEG Annual Meeting, October 23–28, 1994
Paper Number: SEG-1994-0105
..., but one factor is often neglected - anisotropy. Although many agree that anisotropy probably has an impact on AVO, few field measurements of anisotropy have been made and its effect on AVO is not widely known. Walkaways, and in particular marine multi-offset VSPs acquired with an array of triaxial...
Proceedings Papers

Paper presented at the Abu Dhabi International Petroleum Exhibition and Conference, October 13–16, 2002
Paper Number: SPE-78507-MS
... carbonate field in the Middle East, and processed with techniques specifically designed to preserve and extract the azimuthal effects in the data. The results showed significant azimuthal anisotropy in amplitude, with apparent azimuthal variation in the P-wave AVO slope of as much as 100% at selected target...
Proceedings Papers

Paper presented at the SEG International Exposition and Annual Meeting, September 15–20, 2019
Paper Number: SEG-2019-3211060
... (1986) accounted for the effects of seis- mic anisotropy in the seismic method. Bork et al. (1997) and Hilterman (2001) provided examples with anisotropic forward modeling in order to show significant differences between the AVO responses with and without anisotropy. More impor- tantly, they also...
Proceedings Papers

Paper presented at the SPE/AAPG/SEG Unconventional Resources Technology Conference, July 22–24, 2019
Paper Number: URTEC-2019-480-MS
... of weak contrast and weak anisotropy. For this reason, AVO inversion based on above equations does not produce correct results when target shale has strong contrasts and strong anisotropy (Lavaud et al., 1999; Lim et al., 2017). Recently, Lim et al. (2017) showed an effective AVO inversion method...
Proceedings Papers

Paper presented at the SEG International Exposition and Annual Meeting, October 11–16, 2020
Paper Number: SEG-2020-3427291
... provides a high-quality data data. Considering the effect of anisotropy on the velocity, for the analysis of AVO and AVAZ. which could be estimated and picked more accurately. And perform HTI anisotropy correction on the pre-stack Theory and/or Method migration gathers in the OVT domain, which effectively...
Proceedings Papers

Paper presented at the SEG International Exposition and Annual Meeting, September 15–20, 2019
Paper Number: SEG-2019-3192321
... impedance versus P-to S velocity ratio on vertical well-log from SE Asia. We have also estimated the effective anisotropy and Thomsen parameters and performed the AVO trend using the rock physics template. Due to the interbedded sequence of sand and shale with varying internal structure and constituents...
Proceedings Papers

Paper presented at the 1997 SEG Annual Meeting, November 2–7, 1997
Paper Number: SEG-1997-2017
...ss 6.8 Anisotropic effects of aligned cracks on P-wave AVO J. K. Hong, K. Y. Kim, and K. Lee SUMMARY Fractures and cracks in seals and reservoirs give rise to velocity anisotropy and accordingly distort AVO responses. Anisotropic effects on P-wave AVO are investigated in the media with vertical...
Proceedings Papers

Paper presented at the International Petroleum Technology Conference, December 7–9, 2009
Paper Number: IPTC-13903-MS
... prestack P-wave seismic for estimating azimuthal anisotropy to detect fractures, was done by Luo et al., 2005, Holmes and Thomsen, 2002, and Roberts et al., 2001. Open fractures in the subsurface, when vertical and aligned, may be detected with seismic anisotropy using azimuthal AVO inversion of P-wave...
Proceedings Papers

Paper presented at the Offshore Technology Conference, May 2–5, 2005
Paper Number: OTC-17251-MS
... effect on Vp/Vs prediction and AVO modeling. 4. Developing a methodology for AVO analysis in deviated wells. 5. Utilizing azimuthal anisotropy for well planning. Estimating from Stoneley waves As early as 1965, White found that low-frequency Stoneley- wave velocity is determined primarily by borehole...
Proceedings Papers

Paper presented at the 2005 SEG Annual Meeting, November 6–11, 2005
Paper Number: SEG-2005-0150
..., offshore North-West Shelf, Western Australia is used here to show that seal anisotropy can have the first order effect on AVO gradient for moderate to far offset range. Moreover, significant variation of the seal anisotropy across the field further complicates AVOAz response and makes characterization...
Proceedings Papers

Paper presented at the 2013 SEG Annual Meeting, September 22–27, 2013
Paper Number: SEG-2013-0465
...). The purpose of this paper is to investigate the effect of anisotropy on the AVO response of organic-rich shales. This is done by using parameters given by Vernik and co- workers in their study of the Bakken shale. Theory Based on petrographic and SEM observations, Vernik and Landis (1996) describe the texture...
Proceedings Papers

Paper presented at the SPE/AAPG/SEG Unconventional Resources Technology Conference, July 22–24, 2019
Paper Number: URTEC-2019-404-MS
... correct results when target shale has strong contrasts and strong anisotropy (Lavaud et al., 1999; Lim et al., 2017). Recently, Lim et al. (2017) showed an effective AVO inversion method to estimate horizontal P-wave velocity even for strong anisotropy, when full Zoeppritz solutions for PP reflection...
Proceedings Papers

Paper presented at the 1997 SEG Annual Meeting, November 2–7, 1997
Paper Number: SEG-1997-1997
... gives smaller A and B in far offsets compared to near offsets. Anisotropy has profound effects on AVO. Layering anisotropy (transversely isotropic with vertical symmetry axis, or TIV) in cap rocks has been studied extensively (Samec et al., 1990; Blangy, 1994; Hanitzsch et al., 1995; Waluyo et al., 1995...
Proceedings Papers

Paper presented at the 2014 SEG Annual Meeting, October 26–31, 2014
Paper Number: SEG-2014-0680
... and Ruger, 1997) indicates that the smaller the contrasts of compressional, shear velocity and density and the larger the contrasts in and across an interface of reflection, the greater the effects of anisotropy on the AVO signature: (1) ( ) 22 0 02 2 0 0 0 0 tansin 2 1sin 2 2 1 2 1...

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