基于三相Biot速度应力波动方程的水合物储层波场数值模拟OA北大核心CSTPCD

Natural gas hydrate reservoirs are considered as three-phase porous media,comprising skeleton,hydrate,and pore water.Utilizing the three-phase Biot first-order velocity stress wave equation as the governing equation for sound wave propa-gation in gas hydrate reservoirs,numerical simulations are conducted employing the finite difference time domain(FDTD)method.The wavefield snapshots vividly illustrate three compressional waves and two shear waves,consistent with Biot̍s the-ory.Through parameter optimization of the control equation based on measured velocities,numerical velocities are aligned with measured velocities.The results highlight porosity as the most influential factor on the shear stress component of gas hy-drates,followed by impacts on hydrates,pore water,and skeleton velocities.Consequently,porosity is best analyzed using the shear stress component of gas hydrates in reservoirs.The skeleton velocity and stress components are less affected by sat-uration,while the shear stress component of gas hydrates is most affected.Therefore,the optimal choice for analyzing gas hy-drate saturation in reservoirs is the shear stress component of gas hydrates.