Geomechanical Data Base of Rock Samples from the Žarošice Hydrocarbon and Storage Complex (South Moravia, Czech Republic): Petrophysics, Stiffness, Strength, and Effective Stress Estimates for Mechanical Stability Evaluations During Co2 Injection

Abstract

Having access to certified storage locations is fundamental for any CCS value chain. Determining the long-term geomechanical stability are one of the central ingredients in ensuring the injected CO2 remains underground. This paper describes the geomechanical data collected in the proposed CO2 injection pilot under development in the CO2-SPICER project. The project was designed to aid the development of a first-of-its kind CO2 storage pilot into a depleted oil and gas field in the Moravia region, the Southeast Czech Republic. Rock samples were acquired from drill cores obtained during well development in early 2000s. Test samples from all relevant formations in the storage complex were subject to mechanical stiffness and strength tests. Thus, a database of geomechanical results has been developed and shared here. Based on estimates of Earth stresses mechanical stability can be evaluated. The data set paves the ground to analyze how future injection scenarios of cold CO2 would change the effective stresses in the field.

Keywords: Geomechanical database, stiffness, strength, CO2 storage, Earth stresses, effective stress, thermal effects