Theoretical Modeling on Compressional Wave Velocity Variation with Temperature in Fluid-saturated Rocks

摘要

Understanding the influence of temperature on the physical and mechanical properties of rocks is important to investigate the deep oil and gas resources, geothermal resources and other exploration projects. In this paper, we utilize the Batzle-Wang equations to establish the fluid model at different temperatures, and then analyze the wave response characteristics of rocks based on the double-porosity media model. Therefore, a model for characterizing the relationship between seismic properties and reservoir fluid temperature is proposed. Comparison of the predicted P-wave velocity with the measurements of the basalt rock samples showed that the P-wave velocity-temperature curves predicted by the model agree well with the experimental data. Finally, the model proposed in this paper can better describe the dependence of P-wave velocity on temperature, and it can provide a basis for predicting reservoir seismic wave velocity changes in actual geothermal exploration.