"Geological storage projects of CO₂ are designed to maintain secure storage for thousands of years. Carbon Capture and Storage has been identified as one of the methods which is used to reduce global emission of CO₂ and achieve lower concentration of CO₂ in the atmosphere by capturing the CO₂ from the flue gases and storing it in underground formations. Potential leakage of injected CO₂ from the reservoir to the surface is caused by the reactivation of pre-existing faults and fractures which is caused by the change in the state of stresses and the pore pressure. To avoid damage to the reservoir seals, ensure fault stability and validate maximum sustainable pore pressure, a geomechanical characterization which refers to the assessment of the in-situ stress, elastic properties and rock strength of the rock helps to determine the seal integrity of the caprock and the storage capacity of the reservoir during and after injection of CO₂ in underground formations. In this study a direct shear apparatus was assembled in order to determine the direct and residual shear strengths of the rock. Mohr-Coulomb failure criteria, slip tendency parameters and joint roughness coefficient were used to determine the chances of the reactivation of pre-existing faults and fractures in the caprock and the reservoir rock. It was seen from the study that if in-situ stress regime were considered none of the faults or fractures is getting reactivated. This study also helped to develop a sustainable pore pressure window and the maximum sustainable pore pressure is calculated for the reactivation of faults. If the injection pressure of CO₂ is kept between the sustainable pore pressure window there will be no reactivation of faults and the leakage of CO₂ from the reservoir to the surface can be avoided"--Abstract, page iii.
Geosciences and Geological and Petroleum Engineering
M.S. in Petroleum Engineering
DOE Energy Storage Program
United States. Department of Energy
Missouri University of Science and Technology
x, 114 pages
© 2012 Ishan Kumar, All rights reserved.
Thesis - Open Access
Carbon cycle (Biogeochemistry)
Faults (Geology) -- Missouri
Print OCLC #
Electronic OCLC #
Link to Catalog Record
Kumar, Ishan, "Direct shear testing of fractured rocks from Missouri used to evaluate potential fault reactivation induced by carbon dioxide sequestration" (2012). Masters Theses. 5289.