Cluster bearing of resident PAH/BTEXs contaminants under double-diffusion of invaded supercritical carbon dioxide in sedimentary geostorage media

This work reveals a key goestorage mechanism of supercritical carbon dioxide in a sedimentary soil sample, with a clustering response of resident contaminants such as benzene, naphthalene, and pyrene. These contaminants are deposited on the surface of the solid bundles with a mass film thickness of 5 μm. The injection boundaries of sCO₂ are ranged between 300−330 K, and 8−10 MPa, with a mass flow rate of 0.05–0.15 kg/min. A variant of Color Fluid Lattice-Boltzmann model is developed to mimic the breakthrough of sCO₂ front in the pore bodies under the effect of generated clusters such as BN-embedded tetraphene. During the spatiotemporal invasion, the interfacial mass diffusion is jumped in Gaussian magnitudes with dominant effects of mass flow rate and injection pressure. The growth of BN-tetraphene revealed the authority of a critical operating time to promote the action of the residual chemical potential on the solvation power of sCO₂. However, this cluster is affected by a secondary degradation following the increased concentration of sCO₂ in the pore throats of the microporous. Remarkable diffusion is achieved in the case of sCO₂/naphthalene, with a large amount of collected naphthalene and relatively low clogged pores, due to the supercritical solvation power of CO₂ inside the microporous. These results support the theory of carbon capture and storage in reactive porous reservoirs.