P-, SV-, SH-waves reflection wavefields analysis based on nine-component physical modeling on solid surface
Ruixiang Zhang, Pinbo Ding, Feng Zhang, Jieli LiAbstract
SS-waves (SH-SH and SV-SV waves) data can more accurately calculate fracture parameters, image gas-cloud areas, and invert S-wave velocity and density. However, due to high acquisition costs and a low signal-to-noise ratio (SNR), high-quality SS-waves seismic data are limited in field seismic exploration. In the laboratory, previous experimental studies on the fracture parameters and geophysical properties of reservoirs were mostly based on one-dimensional ultrasonic S-wave transmission, which failed to study amplitude variation with offset (AVO) in SS-waves reflection gathers. This study systematically introduces a new physical modeling method on solid surface, and analyses two-dimensional reflection wavefields of P-P, SV-SV, SH-SH, and converted P-SV waves acquired using the method. Unlike traditional physical modeling on water surface that only captures PP-wave reflections, this new method can acquire nine-component seismic reflection gathers featuring stronger amplitudes, although it also results in higher noise levels. F-K filtering can effectively improve the SNR of multi-wave data. Notable observations include the following: the amplitude of P-wave reflections varies considerably across different wavefields, while frequency changes are relatively small; the signal types in the SV-SV wavefield are diverse, including P-wave, SV-wave, and converted waves; in contrast, the SH-SH wavefield primarily consists of SH-wave reflections with higher amplitudes. The amplitude variation with angle (AVA) characteristics of SH-wave reflections influenced by porosity parameters are also discussed and analyzed, revealing that these characteristics vary across different porosity ranges. The experimental results may contribute to advancing the application of SH-wave data in reservoir characterization and enhancing the understanding of the characteristics of various signals within SV- and SH-wave-excited wavefields.