Abstract: Hydrofracturing-liquefaction mechanism is the basic theory for understanding the in-situ stress measurement, the petroleum-gas (nature gas and shale gas)-geothermic development, and earthquake damage evaluation and mechanism study. Due to the complexity and challenge of this issue, mechanism of dynamic hydrofracturing-liquefaction is still not clear, even if a lot of fundamental and landmark achievements had been obtained in this field since the 1960′s. In this work, transient hydrofracturing-liquefaction of tight sandstone under earthquake wave was studied by using hybrid lattice Boltzmann and finite element fluid-solid coupled modeling on parallel GPU-CPU environment. First, the tight sandstone sample from the Ordos Basin Triassic formation was selected and different tomography resolution data was obtained by X-ray CT digital technology. Then, based on the D3Q27 lattice Boltzmann and finite element method, the fluid-solid coupled porous medium physical modeling was established, and the relatively hydrofracturing-liquefaction of tight sandstone was obtained for the first time. Last, the hydrofracturing-liquefaction process was simulated, and the relationship between the amplitude, frequency and time of the earthquake wave and the tight sandstone pore-network evolution, maximum tight sandstone fracturing-liquefaction stress criteria was explored.

Key words: Hydrofracturing-liquefaction of tight sandstone, Earthquake wave, X-ray CT resolution, Lattice Boltzmann and finite element method, Parallel CPU-GPU technology