Rock mechanical properties


The determination of a reservoir's mechanical properties is critical to reducing drilling risk and maximizing well and reservoir productivity. Acoustic logging can provide information helpful to determining the mechanical properties of reservoir rock. Mechanical properties include: * Elastic properties (Young's modulus, shear modulus, bulk modulus, and Poisson's ratio) [SeeStress strain relationships in rocks for calculations of these properties] * Inelastic properties (fracture gradient and formation strength) Elasticity is the property of matter that causes it to resist deformation in volume or shape. Hooke's law describes the behavior of elastic materials and states that for small deformations, the resulting strain is proportional to the applied stress. Depending on the mode of the acting geological force and type of geological media the force is acting upon, three types ofdeformation can result as well as three elastic moduli that correspond to each type of deformation.

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