This paper evaluates the correlation between values of minimum principal in-situ stress derived from four different models which use data obtained from triaxial core tests or sonic logs. The first method utilizes a normalized form of the Mohr failure envelope equation fit different lithologies. The second method utilizes sonic log data to predict Poisson's ratio which is used to calculate the minimum principal in-situ stress. The third method uses a fit to the Mohr…
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