One of the challenges posed by the growing consumption of energy is to limit CO2 emissions. To that end, CO2 geological storage has been proposed as a potential solution. In particular, deep saline aquifers can potentially store many decades worth of CO2 emissions. However, before an underground formation can be considered for geological storage, its ability to trap the injected fluid over thousands of years must be proven. When injecting into deep saline aquifers, a potential problem is fracturing of the caprock that may result from excessive overpressures. In this context, this work proposes an investigation of caprock tensile failure behavior.