Method for determining wetting ability of rock formations using nuclear magnetic resonance measurements, method for determining surface relaxivity of a subsurface rock formation using nuclear magnetic resonance measurements made from within a borehole penetrating the rock formation , method for determining surface relaxivity of a subsurface rock formation, and method for determining water and hydrocarbon saturation in a subsurface rock formation using nuclear magnetic resonance (nmr) relaxation time measurements and constant measurements diffusion

摘要

A method for determining surface relaxivity of a rock formation in a wellbore includes using measurements of nuclear magnetic resonance properties of the rock formation made from within a wellbore penetrating the rock formations includes determining nuclear magnetic relaxation properties from the measurements of the nuclear magnetic resonance properties. A diffusion property of the rock formation is determined from the measurements of the nuclear magnetic resonance properties. The surface relaxivity of the rock formation is determined from the relaxation properties and the diffusion property. The surface relaxivity and other nuclear magnetic resonance properties are used to infer wettability and/or fluid saturation of the rock formations.