METHOD FOR EVALUATING THE FORMATION FACTOR OF AN UNDERGROUND DEPOSIT ON THE BASIS OF MEASUREMENTS OF DRILLING DEBRIS COLLECTED THEREIN

摘要

P - Method for evaluating the formation factor of an underground deposit from cuttings in which a device is used comprising a cell (1) associated with an apparatus for measuring the electrical conductivity of the cell with its contents .- The cell containing the drill cuttings is filled with a first conductive liquid (A) of known conductivity (σa) and after saturation of the drill cuttings with the first liquid (A), the overall electrical conductivity (σ * A) is determined ) of the cell with its content. After evacuation of the liquid, the electrical conductivity of the cuttings still saturated with said first liquid is determined. The respective volume fractions (y, x) occupied in the cell respectively by the cuttings and the liquid between the cuttings are determined, for example by repeating the previous operations with a second liquid and the formation factor (FF) is deduced therefrom. cuttings by combination of measurements.- Applications to the petrophysical characterization of reservoirs. /P