| Popis: |
This study evaluates petrophysical properties (especially porosity, permeability, tortuosity, and diffusivity) of representative geological rocks in the context of injectivity, storage space, and caprock integrity for effective utilization and long-term storage of carbon dioxide. A total of 10 geological rocks were selected as representative storage media for consideration as saline aquifers & depleted oil and gas reservoirs (sandstones and carbonates), basalts, and cap rocks, as well as utilization in organic-rich shale and coal seams. An integrated suite of laboratory tests, including liquid immersion porosimetry, gas expansion porosimetry, grain size distribution, mercury intrusion porosimetry, and gas diffusion, were performed on these various rock samples. The results exhibit a disparity of petrophysical properties among two broad groups of rocks: rocks selected for possible storage of CO2have porosities of ∼10-25%, permeabilities of ∼10−16-10−13m2, μm-sized pore-throat size distribution, and mostly good pore connectivity; in contrast, the potential caprocks have porosities of ∼0.5-5%, permeabilities of ∼10−20-10−18m2, pore throat sizes of |
