Sixth Annual Conference on Carbon Capture & Sequestration Evaluation of Geological Formations Dynamics of CO 2 Plumes Encountering a Fault in a Reservoir May 7-10, 2007 • Sheraton Station Square • Pittsburgh, Pennsylvania Kyung Won Chang and Steven L. Bryant The University of Texas at Austin
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Sixth Annual Conference on Carbon Capture & Sequestration
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Sixth Annual Conference on Carbon Capture & Sequestration
Evaluation of Geological Formations
Dynamics of CO2 Plumes Encountering a Fault in a Reservoir
May 7-10, 2007 • Sheraton Station Square • Pittsburgh, Pennsylvania
Kyung Won Chang and Steven L. Bryant
The University of Texas at Austin
Acknowledgement
• Support is gratefully acknowledged from– CCP2 (CO2 Capture Project 2) – Geologic CO2 Storage Joint Industry
• Project Members of the JIP include– Chevron– Computer Modeling Group, Ltd.– ENI– ExxonMobil– Shell– TXU
Objective
• CCS technology aims at permanent storage– However, every storage site contains imperfections– Injected CO2 tends to rise toward the surface by
buoyancy
• Is it possible to improve the efficiency of CO2trapping?– Residual saturation trapping– Taking advantage of fault properties within the
reservoir• geometry • petrophysical properties
• Tilted reservoir– Dip angle is 5 degree
• Cartesian grid– 1 x 200 x 50– Cubic scale: 2ft x 2ft x 2ft
• No injection and production modeling
– Assign initial CO2 location to mimic an “inject low and let rise” strategy
– Perfectly closed boundary condition
Simulation Model Scheme: focus on interaction of buoyant plume with faults
Initial CO2
200ft
Reservoir Model Properties
• Domain assumed to have simple petrophysical properties – Homogeneous permeability, porosity– Several values of vertical to horizontal
permeability ratio (kv/kh): Anisotropy vs. Isotropy
– Compare behavior with and without residual saturation trapping