Global Constraints on Reservoir Leakage [chapter]

S PACALA
2003 Greenhouse Gas Control Technologies - 6th International Conference  
A crucial unresolved problem about geological sequestration is that some receptor reservoirs will leak stored CO 2 . At local scales, leaks might endanger shallower drinking water supplies or public health. At global scales, leaks might be large enough to make sequestration ineffective. This paper focuses on the global-scale problem and uses models of carbon storage reservoirs and natural carbon sinks to calculate constraints on reservoir leakage. It assumes fossil fuel consumption at a level
more » ... mption at a level that would that would lead to an atmospheric CO 2 concentration of 750 ppm and then calculates the sequestration and leakage limits that would reduce the maximum concentration to 450 or 550 ppm. The surprising result is that leakage limits are much less severe than expected because of heterogeneity among reservoirs. In some cases, the reduction from 750 to 450 ppm would be possible even with a mean leakage rate of 1% per year or more. The results imply that economic considerations or local risks are likely to constrain allowable leakage rates more tightly than impacts of leakage on global atmospheric CO 2 .
doi:10.1016/b978-008044276-1/50043-x fatcat:6vyrdk6lmvfjdb4a6cbdw4f2mu