Speaker
Description
The injection of CO2 into deep saline reservoirs is an important greenhouse gas mitigation strategy. In many cases, the CO2 source is made up of a mixture of different greenhouse gases. One such case is at the Otway International Test Center in Australia, where the source of CO2 comes from a natural gas reservoir made up of a mixture of methane (CH4) and CO2. Both CO2 and CH4 are soluble in water, though CO2 is about an order of magnitude more soluble than CH4. In this work, we consider how that difference in solubility affects the transport of CO2 and CH4 away from the injection well using analytical solutions and numerical simulation. We find that injecting a mixture of CO2 and a modest fraction of CH4 results in a methane bank forming at the beginning that grows over time as the plume migrates. The results of this work can be used to inform project decision-making and monitoring plans for future projects that inject a mixture of CO2/CH4 into a saline reservoir.
| Country | United States |
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