Numerical calculation method for getting critical point, pore fluid and framework parameters of gas-bearing media

The mostly used methods for studying critical porosity and porous media are experimental measurement and analysis of testing data, and how to determine the porosity at critical point and the constituents' parameters are also topics of great concern. In this article, we provide a method for calculation of these elastic parameters. In the beginning, we derive three linear equations for numerical calculation. By combining regression coefficients of the equations, we propose equations for calculating constituents' parameters. After that we elaborate on the steps for calculation and give some notes. Then we use our method to analyze gas-bearing sandstone samples. In the process, let entire densities, P-velocities and S-velocities as input data, we calculate relative parameters about pore fluid, framework and critical point. In the end, by comparing the results with test data of experiment measurement, we test our method and it is proved to be successful.