MICRORESISTIVITY ANISOTROPY LOGGING TOOL EMPLOYING A MONOPOLE CURRENT INJECTION ELECTRODE

摘要

A microresistivity logging tool (100) includes a monopole current injection electrode (160) and at least first and second pairs of potential electrodes (212,214; 226,228). The tool (100) may further include a controller configured for making microresistivity anisotropy measurements using a single firing of the monopole current injection electrode (160). The controller may be configured to compute a two-dimensional tensor of the local formation resistivity from a single firing of the monopole current injection electrode (160). The use of a single firing tends to decrease measurement time, which in turn tends to improved azimuthal sensitivity in microresistivity anisotropy imaging while drilling applications.