Proper planning and design of a CO2 storage project in a depleted oil field requires that key geomechanical parameters of the reservoir and caprock formations are characterized, namely minimum horizontal stress (Shmin) magnitude and orientation. In this study, a wireline formation testing tool (WFT) configured with a straddle packer with a 1-meter long spacing, was used to conduct multiple hydraulic fracture injection (micro-frac) tests to determine Shmin magnitude during a single deployment of the tool. Acoustic image log was used to determine the orientation of Shmin and maximum horizontal stress (SHmax). The results of the micro-frac tests at different depths in the reservoir and overlying caprock, and implications for using the depleted reservoirs for future CO2 storage are discussed. Also, an analysis of how minimum horizontal stress (and corresponding fracture pressure) increases during the process of filling the reservoir with CO2 was performed to estimate actual fracture pressure during the reservoir filling process. We refer to this as “dynamic” fracture pressure.

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