We describe experimental and numerical pore- and core-scale methods used in our lab in conjunction with industrial and international partners to investigate these effects. We place emphasis on understanding the behavior and transformation of the carbon components in the reservoir, including CO 2(sc/g), CO 2(aq), HCO 3 –, and carbonate minerals (calcite and dolomite), highlight their transport and mobility by coupled geochemical and two-phase flow processes, and consider the implications of these transport mechanisms on estimates of the long-term safety of GCS. In this Account, we summarize our recent work on the effect of CO 2 exsolution and mineral dissolution/precipitation on CO 2 transport in GCS reservoirs. A better understanding of these effects on the CO 2–water two-phase flow will improve predictions of the long-term CO 2 storage reliability, especially the impact of depressurization on the long-term stability. The mineral dissolution and the CO 2 exsolution and mineral precipitation during depressurization change the morphology, porosity, and permeability of the porous rock medium, which then affects the two-phase flow of the CO 2 and formation water. However, subsequent depressurization could lead to dissolved CO 2(aq) escaping from the formation water and creating a new separate phase which may reduce the GCS system safety. As the time after injection increases, the safety of storage increases as the CO 2 transforms from a separate phase to CO 2(aq) and HCO 3 – by dissolution and then to carbonates by mineral dissolution. Pearl is not a mineral because it can only be produced by organic processes.Geological carbon sequestration (GCS) in deep saline aquifers is an effective means for storing carbon dioxide to address global climate change. Opal is a mineraloid, because although it has all of the other properties of a mineral, it does not have a specific structure.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |