Abstract
Thermal fracturing could occur during cold CO2 injection into subsurface warm rock formations. It can be seen in a variety of fields such as carbon geo-sequestration, unconventional gas development, enhanced oil recovery, geothermal energy extraction, and energy geological storage systems. In CO2 geosequestion, limited degree of thermal fracturing due to the cooling effects of cold CO2 injection will enhance well injectivity, especially for those storage formations of low permeability. Thermal fracturing can therefore potentially enhance the injection efficiency and make positive impact on commercialization of CO2 geological storage. However, excessively developed fractures could break down the caprock and cause potential CO2 leakage into overlying rock formations. Risk analysis has to be done based on thermal fracturing simulation in order to maintain caprock integrity.
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