MATHEMATICAL MODELING OF CO2 SEQUESTRATION IN DECCAN VOLCANIC PROVINCE
Carbon dioxide geological sequestration is an important technology for mitigating CO2 from being indefinitely emitted to the earth atmosphere. Injecting carbon dioxide, normally in a supercritical state, into carefully selected hydrocarbon or saline formations gives rise to several physical, chemical and thermo-hydro-mechanical processes occurring at the reservoir and the surrounding region. To mitigate CO2 in atmosphere, authorities, universities and industry worldwide are keen to promote CO2 geo-sequestration projects, which is the only CO2 mitigation option available without limiting the usage of fossil fuel. Design and construction of such projects require elucidation of the involved phenomena and processes. This is attributed to a strong coupling between the involved geometry, trapping mechanisms, temperature and pressure.
Mathematical modeling of sequestration and associated phenomenon in the Deccan volcanic province is the main aim of the paper. Reactive Transport Model is developed based on the geochemical data obtained from different literature sources. Massively parallel reactive transport code PFLOTRAN is used to simulate the effect of geological sequestration on geological time scale in Deccan trap formation. Carbon dioxide flow pattern in the formation, solubility rate of CO2 in the formation water, pH change of the formation, porosity permeability variation in the formation are studied in detail to understand the after effects of sequestration over geological time scale.