Method of the evaluation of the formation of an underground deposit on the basis of measurements on the drilling debris which are levied

摘要

P - method for evaluating the formation of an underground from cuttings in which is made of a device comprising a cell (1) associated with an apparatus for measuring the electrical conductivity of the cell with its contents. - it fills the cell containing the cuttings with a first conductive liquid (a) of known conductivity (σa) and after saturation of the drill cuttings by the first liquid (a), it determines the overall electrical conductivity (σ * a) of the cell with its contents. After removal of the liquid, it determines the electrical conductivity of the drill cuttings yet saturated of the said first liquid. It is possible to determine the respective volumetric fractions (y, x) occupied in the cell, respectively, by the drill cuttings and the liquid between the cuttings, by repeating, for example, the preceding operations with a second liquid, and it infers therefrom the factor of the formation (ff) of the excavated material by a combination of the measurements - applications to the petrophysical characterization of tanks. / p