Inversion simultanée de données d'induction pour la constante diélectrique et la conductivité électrique

Simultane Umkehrung von Induktionsdaten für dielektrische Durchlässigkeit und elektrische Leitfähigkeit

Simultaneous inversion of induction data for dielectric permittivity and electric conductivity

Abstract

A method of inverting induction logging data for evaluating the properties of underground formations surrounding a borehole, the data comprising induction voltage measurements obtained from a tool placed close to the formations of interest, the method comprises: (a) defining a relationship relating the induction voltage to wave number, dielectric permittivity and conductivity; defining a cubic polynomial expansion of the relationship; and solving the cubic polynomial relationship using the voltage measurements to obtain values for conductivity that includes skin-effect correction, and apparent dielectric permittivity; and (b) using the obtained values for conductivity and apparent dielectric permittivity to derive a simulated value of induction voltage; determining the difference between the simulated value of the induction voltage and the measured induction voltage; and iteratively updating the values of conductivity and dielectric permittivity used for the derivation of the simulated value of induction voltage to minimise its difference with respect to the measured value.

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Cited By (2)

    Publication numberPublication dateAssigneeTitle
    EP-2682787-A1January 08, 2014Services Petroliers Schlumberger, Schlumberger Technology B.V., Schlumberger Holdings Limited, PRAD Research and Development LimitedVerfahren und Systeme zur Verbesserung der Auslegung von Formationsbewertungsmessungen
    WO-2014008217-A3May 22, 2014Services Petroliers Schlumberger, Schlumberger Technology B.V., Schlumberger Holdings Limited, Schlumberger Canada Limited, Prad Research And Development Limited, Schlumberger Technology CorporationMethods and systems for improving interpretation of formation evaluation measurements