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1. (WO2018106927) DETERMINATION OF SHALE CONTENT OF FORMATION FROM DISPERSIVE MULTI-FREQUENCY DIELECTRIC MEASUREMENTS

Pub. No.:    WO/2018/106927    International Application No.:    PCT/US2017/065131
Publication Date: Fri Jun 15 01:59:59 CEST 2018 International Filing Date: Fri Dec 08 00:59:59 CET 2017
IPC: G01N 27/22
G01N 33/24
Applicants: BAKER HUGHES, A GE COMPANY, LLC
Inventors: ZHANG, Yinxi
Title: DETERMINATION OF SHALE CONTENT OF FORMATION FROM DISPERSIVE MULTI-FREQUENCY DIELECTRIC MEASUREMENTS
Abstract:
Methods and apparatus for evaluating a volume of an earth formation wherein the volume comprises a fluid-saturated rock matrix including clay particles. Methods include making measurements of complex permittivity at a plurality of frequencies using an electromagnetic tool in a borehole penetrating the earth formation; and estimating a plurality of parameters of interest simultaneously using the measurements at the plurality of frequencies and a mixing model accounting for electrical effects on the measurements caused by the clay particles. The plurality may include at least: i) water saturation; and ii) resistivity of formation water. Parameters of interest may comprise at least one of: i) an electrical parameter of the volume; and ii) a textural parameter of the volume. Methods may include modeling for electrical effects caused by at least one of: i) a surface conductivity of the clay particles; and ii) a textural property of the clay particles.