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Seal Capacity of Potential CO2 Sequestration Sites
Start Date: January 2003
Mark Zoback, Department of Geophysics, Stanford University
This study investigates the seal capacity of deep aquifers, exploited oil and gas reservoirs in order to assess their potential utilization for CO2 sequestration. In addition, the study will examine CO2 injection in coal beds for both sequestration and enhancement of coal bed methane (CBM) production.Background and Approach
Excess pressures at the top of the formation used for sequestration arise from the buoyancy of the CO2 column with respect to the water or oil originally in the reservoir. The excess pressure has the potential to fracture hydraulically the cap rock (allowing leakage to occur), or to activate reservoir-bounding faults that results in leakage of natural gas from reservoirs at depth. This concept, referred to as dynamic seal capacity, has been applied in a number of oil and gas fields around the world. An important outstanding question is how such processes may influence CO2 sequestration.
The approach for this study includes:
The activities to be performed under this effort include:
Figure 1: Trap and Seal Evaluation Workflow
Figure 2: CO2 Sequestration and ECBM in the Powder River Basin
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