Both depleted oil and gas reservoirs and deep saline reservoirs offer potentially viable CO2 storage solutions. We'll examine some of the pros and cons of each.
There is little serious disagreement that without carbon capture, utilisation and storage (CCUS), the global targets for Net-Zero and limiting warming to 1.5oC by 2050 are impossible to meet. The Energy Information Administration (EIA) estimates that 650 million tonnes (Mt) of CO2 storage capacity will be required per year by 2030 to be in line with their sustainable development scenario, with capacity reaching 5,266 Mt/yr by 2050 and 9,533 Mt/yr by 2070 (EIA, 2020). As the technology and infrastructure to capture CO2 become more economically viable, the availability of places to permanently store it becomes crucial.
Both depleted oil and gas reservoirs and deep saline reservoirs offer potentially viable CO2 storage solutions, primarily for complementary reasons. The likely performance and, therefore, the attractiveness of these two types of geological storage will be influenced principally by their containment potential, both in terms of volume and ability to 'seal' away the CO2 for considerable periods of time, and their injectivity potential. Both of these principal controls on the attractiveness of any given storage site are subject to different degrees of uncertainty depending...
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