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The Importance of Locally Converted Shear Waves in the Thin Layers AVO Response - A Physical Modeling Study
- Publisher: European Association of Geoscientists & Engineers
- Source: Conference Proceedings, 78th EAGE Conference and Exhibition 2016, May 2016, Volume 2016, p.1 - 5
Abstract
This work aimed to study the seismic amplitude response of two physical models, one composed of thin water layer and the other of an acrylic thin layer. Physically modeled data was chosen as the reference for the amplitude analysis because this kind of modeling reproduces real wave propagation phenomena. Common midpoint data were acquired over each physical model using semi-spherical piezoelectric transducers. Then the data were processed to remove linear noise and to compensate amplitudes for effects like source/receiver directivity, geometric spreading and transmission losses. Finally, the experimental AVO behavior and the AVO obtained from numerical modeling through the reflectivity method were compared. It was observed that local P-SV mode conversions may influence considerably the thin layer AVO behavior and internal multiple reflections generally have low order effects. The reflectivity method parameterized with the experimental wavelet and in a separate modeling with a Ricker wavelet, in the same frequency bandwidth of the experimental wavelet, modeled experimental reflection data with high precision.