Multi-Frequency Electromagnetic Tensor Measurements

摘要

An electromagnetic measurement tool for making multi-frequency, full tensor, complex, electromagnetic measurements includes a triaxial transmitter and a triaxial receiver deployed on a tubular member. An electronic module is configured to obtain electromagnetic measurements at four or more distinct frequencies. The measurement tool may be used for various applications including obtaining a resistivity of sand layers in an alternating shale-sand formation; computing a dielectric permittivity, a conductivity anisotropy, and/or a permittivity anisotropy of a formation sample; and/or identifying formation mineralization including discriminating between pyrite and graphite inclusions and/or computing weight percent graphite and/or pyrite in the formation sample.

主权项

1. An electromagnetic measurement tool comprising:
a nonconductive tubular member configured to receive a formation sample; a triaxial transmitter deployed on the tubular member; a triaxial receiver deployed on the tubular member, the triaxial receiver being spaced apart from the triaxial transmitter along a longitudinal axis of the tubular member; and an electronic module configured to (i) cause the triaxial transmitter to transmit electromagnetic energy into the formation sample at four or more distinct and sequential frequencies and to (ii) cause the triaxial receiver to receive said transmitted electromagnetic energy each of the four or more frequencies.