Application of Velocity Variation with Angle (VVA) Method on an Anisotropic Model with Thomsen Delta Anisotropy Parameters
Abstract
Anisotropic properties will influence seismic propagation, for example it will affect wave velocity. One of well-known anisotropi equation for Transversaly Isotropic media is weak anisotropy with Thomsen's notation. Supriyono [2011] tried to estimate all of these variables by using velocity variation with angle (VVA) attribute. This research uses synthetic data, which is CMP Gather to know limitations of VVA attribute, to identify the error values, and to determine the best indicator of anisotropic eect. This research also uses another analysis method, which is grid search inversion to estimate VP0. From this research, Both VVA and grid search invesion still produce signcant error. The effects which will appear because of anisotropic property's presence are hockey-stick and over NMO-stretching.
References
Supriyono. 2011. Velocity Variation with Angle or Offset (VVO), A New Tool for Direct Hydrocarbon Indicator:
Case Studies in Low and High Impedance Clastic Reservoir. Disertasi Doktoral ITB.
Thomsen, L. 2002. Understanding Seismic Anisotropy in Exploration and Exploitation. Society of Exploration
Geophysicists: Tulsa.
Walden, A.T. Making AVO sections more robust. Geophysical Prospecting, Vol. 39, p. 915-942. (1991)
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