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32 Technical Summary Figure TS.7. Methods for storing CO2 in deep underground geological formations. Two methods may be combined with the recovery of hydrocarbons: EOR (2) and ECBM (4). See text for explanation of these methods (Courtesy CO2CRC). Once injected into the storage formation, the fraction retained depends on a combination of physical and geochemical trapping mechanisms. Physical trapping to block upward migration of CO2 is provided by a layer of shale and clay rock above the storage formation. This impermeable layer is known as the “cap rock”. Additional physical trapping can be provided by capillary forces that retain CO2 in the pore spaces of the formation. In many cases, however, one or more sides of the formation remain open, allowing for lateral migration of CO2 beneath the cap rock. In these cases, additional mechanisms are important for the long-term entrapment of the injected CO2. Next, chemical reactions between the dissolved CO2 and rock minerals form ionic species, so that a fraction of the injected CO2 will be converted to solid carbonate minerals over millions of years. The mechanism known as geochemical trapping occurs as the CO2 reacts with the in situ fluids and host rock. First, CO2 dissolves in the in situ water. Once this occurs (over time scales of hundreds of years to thousands of years), the CO2- laden water becomes more dense and therefore sinks down into the formation (rather than rising toward the surface). Geographical distribution and capacity of storage sites As shown earlier in Section 2 (Figure TS.2b), regions with sedimentary basins that are potentially suitable for CO2 storage exist around the globe, both onshore and offshore. This report focuses on oil and gas reservoirs, deep saline Yet another type of trapping occurs when CO2 is preferentially adsorbed onto coal or organic-rich shales replacing gases such as methane. In these cases, CO2 will remain trapped as long as pressures and temperatures remain stable. These processes would normally take place at shallower depths than CO2 storage in hydrocarbon reservoirs and saline formations.PDF Image | CARBON DIOXIDE CAPTURE AND STORAGE
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