P-wave attenuation characteristics of experimental observation and theoretical simulation in tight oil rocks

As a kind of unconventional oil and gas resources that are widely distributed in China, tight oil has great potential for petroleum prospecting. In this study, ultrasonic experiments were performed on 12 tight oil rock samples. The P-wave attenuation of fluid-saturated specimens was estimated by the spectral ratio method. The results suggest that at ultrasonic frequencies, most specimens have stronger attenuation under gas-saturated conditions than at water- or oil-saturated conditions. The triple-porosity structure model is used to simulate the wave propagation characteristics of tight oil rocks in a wide frequency range. The results predicted by the triple-porosity structure model and the experimental data are in a good agreement. The experimental results and model parameters of tight oil rocks are statistically analyzed. The relationships between seismic wave response and reservoir parameters are obtained.