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State of Stress Analysis Tool

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The state of stress influences several potential risks associated with geologic carbon storage (GCS). Among these are the risk of induced seismicity and leakage due to unintentional hydraulic fracturing. In situ stress can be measured or inferred using several techniques, but these measurements are only made at discrete locations, and they generally provide an incomplete description of the full stress tensor. Because of this there is generally considerable uncertainty in the state of stress within a GCS reservoir and surrounding formations. The state of stress analysis tool (SOSAT) provides a method to use a Bayesian approach to calculate a probability distribution for in situ stress at a particular point using a variety of common data types. Using this stress state probability distribution, the SOSAT then calculates the probability of activating a critically-oriented fault at a specified range of pore pressures. The result is an easy to use physics-based tool for estimating the risk of induced seismicity and unintentional hydraulic fracturing.

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Citation Burghardt J.A. 2018. "Geomechanical risk assessment for subsurface fluid disposal operations." Rock Mechanics and Rock Engineering 51, no. 7:2265-2288. doi:10.1007/s00603-018-1409-1
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