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| | Abstract | | To appraise the utility of gravity measurements for monitoring CO2 injected into aquifers, we carried out numerical simulations of a few aquifer systems and calculated the temporal microgravity changes caused by changing underground conditions as computed by the reservoir simulation. We used the STAR general-purpose reservoir simulator with the CO2SQS equation-of-state package which treats three fluid phases, that is, liquid- and gaseous-phase CO2 and an aqueous liquid phase, to calculate the evolution of reservoir conditions, and then used the postprocessor to calculate the resulting temporal changes in the distributions of microgravity. Regarding observation method time-lapse hybrid measurements with the combination of absolute and relative gravimetry should be effective. Although the applicability of any other particular method, that is, borehole gravimeter, sea-bottom gravimeter, or superconducting gravimeter, is likely to be site-specific, these calculations indicate that each gives us valuable information. |
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