Experimental verification of spherical-wave effect on the AVO response and implications for three-term inversion
作者： Mohammed Alhussain , Boris Gurevich , Milovan Urosevic
DOI: 10.1190/1.2837641
关键词: Point source 、 Ultrasonic sensor 、 Computational physics 、 Mathematics 、 Curvature 、 Amplitude 、 Estimation theory 、 Reflection (physics) 、 Plane wave 、 Inverse problem 、 Geometry
摘要: Spherical-wave offset-dependent reflectivity is investigated by measuring ultrasonic reflection amplitudes from a water/Plexiglas interface. The experimental results show substantial deviation of the measured plane-wave coefficients at large angles. However, full-wave numerical simulations point source response using algorithm excellent agreement with measurements, demonstrating that caused wavefront curvature. To analyze effect curvature on elastic inversion, we simulate spherical-wave different frequencies and invert for parameters least-square fitting (Zoeppritz) solution. two-parameter inversion based intercept gradient robust, although estimation three ( VP , VS density) use offset variation angle (AVA) prone...
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