Articles | Volume 11, issue 4
https://doi.org/10.5194/se-11-1361-2020
https://doi.org/10.5194/se-11-1361-2020
Research article
 | 
22 Jul 2020
Research article |  | 22 Jul 2020

Stress field orientation controls on fault leakage at a natural CO2 reservoir

Johannes M. Miocic, Gareth Johnson, and Stuart M. V. Gilfillan

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Short summary
At the St. Johns Dome, Arizona, CO2 naturally occurs in the subsurface, but there are travertine rocks on the surface which are an expression of CO2 leakage to the surface. These travertine deposits occur along faults, zones where the rock layers are fractured and displaced. In our research, we use geomechanical analysis to show that the CO2 leakage occurs at points where the faults are likely to be permeable due to the orientation of the geological stress field in the subsurface.