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Session:

Plenary 8

Abstract No.:

O-090

Title:

A Study on How Top-Surface Morphology Influences the CO2 Storage Capacity

Author(s):

A.R. Syversveen, Norwegian Computing Center (NO)
H.M. Nilsen, SINTEF (NO)
K.A. Lie, SINTEF (NO)
J. Tveranger, Center for Integrated Petroleum Research (NO)
P. Abrahamsen, Norwegian Computing Center (NO)

Abstract:

CO2 can be stored in oil and gas reservoirs or in suitable aquifers. In a suitable location, the probability for leakage must be small, the storage capacity must be big enough, and injection of CO2 through wells must be possible. An important trapping mechanism of CO2 is structural trapping, which means accumulation under cap rock. We present a study on how different cap rock geometries will influence the CO2 storage capacity. Alternative cap rock geometries are created by combining different stratigraphic scenarios with different structural scenarios. Both stratigraphic and structural scenarios are stochastically generated, and uncertainty studies are performed. Stratigraphic surfaces are generated by Gaussian random fields, while faults are generated by marked point processes. The storage capacity is calculated by a simple and fast spill point analysis, and by a more extensive method including fluid flow simulation where parameters such as pressure and injection rate are taken into account. Results from the two approaches are compared. The study shows that cap rock geometry is of great importance to the storage capacity.