CO2 Sequestration [Reservoir Geo-mechanics]
How easy would it remain to deduce the knowledge on the in-situ state of stresses, that remains close to limit equilibrium (associated with the CO2 sequestration in a deep saline aquifer), which eventually pushes the window for pore pressure alteration to remain to be relatively narrow – even in the absence of fault reactivation?
What is the probability of open-mode fractures getting triggered by high injection of rates of CO2 in such cases?
In case, if the reservoir remains compartmentalized by nature, then, in such cases, whether, large injection volumes of CO2, even with low injection rate over time – could still reactivate shear fractures and faults? Whether fault reactivation does necessarily imply CO2 leakage?
What would be the magnitude of maximum induced seismicity in such cases?
And, what would be the short-term implications of pressure build-up and long-term fate of stored CO2 in such cases?
Can we deduce all the required petrophysical properties and geo-mechanical properties from experimental measurements and well-logging data analysis?
How exactly to deduce the actual amount of CO2 injection for fault reactivation?
Do we require any other detail than precisely determined in-situ stresses and flow boundary conditions?
What would be the maximum CO2 injection rate, below which, the pore pressure build-up would easily get transferred to neighboring faults?
Suresh Kumar Govindarajan
Professor (HAG) IIT-Madras
https://home.iitm.ac.in/gskumar/
https://iitm.irins.org/profile/61643
23-July-2024
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