Analyzing the seismic response characteristics of P, SV, and SH waves to reservoir parameters using physical modeling

Changes in reservoir parameters cause differences in seismic response characteristics, which can reflect the formation lithology and fluids. We conduct seismic physical modeling and seismic response characteristic analysis of P, SV, and SH wavefields. A seismic physical model is developed in the laboratory, which included several groups of sandstone blocks for simulating reservoir parameters, such as different fluid and clay content. Two-dimensional wavefield data of P-P, SV-SV, and SH-SH waves are acquired and processed in the laboratory. Compared with P waves, SV and SH waves are insensitive to pore fluids, and the SH stack profile is superior to the SV stack profile. The reflection events at the interface are slightly better for the SH-wave section than for the SV-wave section. The reflection coefficient of P waves varies greatly on amplitude variation with angle (AVA) gathers and is significantly influenced by factors such as fluids. The variation in the SV-wave reflection coefficient on AVA gathers is not as significant as that of P waves, and SV and SH waves are more conducive in identifying whether the block contained clay. The SH wave is more reliable for seismic imaging. Overall, this study can assist in combining different seismic wave data for better hydrocarbon identification and reservoir description.