Abstract:OVT-domain wide-azimuth prestack seismic attribute analysis is one of the most important approaches in wide azimuth seismic. Based on azimuthal anisotropy analysis, it can excavate geological and fluid information contained in prestack seismic datasets and effectively carry out reservoir prediction. In this paper we first make a brief introduction to OVT and its development history, and its innovations on seismic interpretation, and then discuss four types of OVT-domain prestack seismic attribute analysis, namely, the template-based dynamic OVT gather analysis and stacking imaging, OVT-domain multi-offset and multi-azimuth analysis, AVO analysis, and azimuthal anisotropy analysis. As an advanced prestack seismic interpretation tool, it provides an effective way for reservoir and fluid prediction on prestack seismic data. Real examples in carbonate fracture prediction show that the proposed approach breaks through the limitations of conventional poststack seismic interpretation, realize the high-precision azimuthal anisotropy analysis based on OVT gathers, and improve the accuracy of seismic structure analysis and reservoir characterization.
Williams M and Jenner E. Interpreting seismic data in the presence of azimuthal anisotropy or azimuthal anisotropy in the presence of the seismic interpretation. The Leading Edge,2002,21(8):771-774.
Liu Yimou,Yin Xingyao,Zhang Sanyuan et al. Recent advances in wide-azimuth seismic exploration. OGP,2014,49(3):596-610.
[3]
Vermeer G J O.Creating image gathers in the absence of proper common offset gathers. Exploration Geophysics,1998,29(4):636-642.
[4]
Vermeer G J O.Processing with offset-vector-slot gathers. SEG Technical Program Expanded Abstracts,2000,19:5-8.
[5]
Vermeer G J O. Processing orthogonal geometry-what is missing. SEG Technical Program Expanded Abstracts,2005,24:2201-2204.
[6]
Cary P W. Common-offset-vector gather:an alternative to cross-spreads for wide-azimuth 3-D surveys. SEG Technical Program Expanded Abstracts,1999,18:1496-1499.
[7]
Cary P W and Li X. Some basic imaging problems with regularly-sampled seismic data. SEG Technical Program Expanded Abstracts,2001,20:981-984.
Duan Wensheng,Li Fei,Li Shiji et al. Multiple attenuation by prestack migration in the OVT domain. OGP,2013,48(S1):36-41.
[11]
Rutherford S R and Williams R H. Amplitude versus offset variations in gas sands. Geophysics,1989,54(6):680-688.
[12]
Ostrander W J. Plane waves reflection coefficients for gas sands at normal angles of incidence. Geophysics,1984,49(10):1637-1648.
[13]
Aki K and Richards P G. Quantitative seismology - theory and method. W H Freeman and Company,San Francisco,1980.
[14]
Shuey R T. Amplification of the Zoeppritz equations. Geophysics,1985,50(4):609-614.
[15]
潘仁芳.AVO的内涵与外延.石油天然气学报,2006,24(2):50-55.
Pan Renfang. Intension and extension of AVO. Journal of Oil and Gas Technology,2006,24(2):50-55.
[16]
Ruger A.P-wave reflection coefficients for trans-versely isotropic models with vertical and horizontal axis of symmetry. Geophysics,1997,62(3):713-721.
[17]
Ruger A. Variation of P-wave reflectivity with offset and azimuth in anisotropic media. Geophysics,1998,63(2):692-706.
[18]
Ruger A and Tsvankin I. Using AVO for fracture detection:Analytic basis and practical solutions. The Leading Edge, 1997,16(10):1429-1434.