Abstract
Laboratory test methods are introduced to determine stress–strain relationships and rock strengths. Rock failure mechanisms are studied based on uniaxial and triaxial compression tests. Empirical equations and correlations between rock strengths and petrophysical and geophysical properties are presented for different lithologies. New correlations for deepwater reservoirs and shale oil and shale gas formations are proposed. These correlations enable one to obtain continuous rock strengths along the depth interval of interest from well logging and seismic data (e.g., sonic velocity, transit time, and porosity). Rock failure criteria are examined to reveal rock failure mechanisms, including linear and nonlinear Mohr–Coulomb, Drucker–Prager, true triaxial, Cam–Clay, and modified Griffith failure criteria. Their suitability and applicability for geomechanical modeling are also discussed. The anisotropy of rock strengths and its impact on rock failures are also investigated.
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