Influence of geochemical processes on the geomechanical response of the overburden due to CO2 storage in saline aquifers

作者：Sai Bharath Kumar Varre · 年份：2014 · DOI：10.33915/etd.7354 · 被引用次数：2 · 研究领域：CO2 Sequestration and Geologic Interactions、Hydraulic Fracturing and Reservoir Analysis、Rock Mechanics and Modeling

Saline aquifers have been identified as desirable geologic formations, suitable for the storage of carbon dioxide (CO2) in large amounts. While the impermeable caprock layer(s) in the overburden provide(s) the primary trap for injected carbon dioxide, other trapping mechanisms, such as solubility, residual, ionic or mineral trapping, help contribute to CO2 storage. Geochemical reactions alter the petrophysical properties such as porosity in the target reservoir, and may have an influence on the reservoir storage capacity. When CO2 is injected for long periods of time, it changes the fluid pressures and the overburden geomechanical response. The geomechanical response associated with time-dependent geochemical reactions may also influence the integrity of the caprock layer and the long-term fate of injected CO 2.;In the current study, coupled multiphase fluid flow and geomechanical modeling with geochemical reactions was performed to simulate the long-term (1,000 years), large-scale injection of CO2 (up to10 million metric tons per year) into a deep saline aquifer. The primary objective of the study is to investigate the influence of geochemical reactions on the geomechanical response of the overburden during long-term CO2 injection. The geochemical modeling results show that geochemical reactions, such as mineral dissolution and precipitation, do not have a significant influence on reservoir rock porosity (about 2% reduction). However, an increase in the mineral reaction rate...