The concept of triaxial induction measurements can be traced back to 1960s. The first commercial triaxial induction tool has been in service for more than a decade. The tensor type of measurements acquired by the triaxial induction tool enables extracting not only the resistivity anisotropy but also the dip of a subsurface formation. The first anisotropic resistivity model that was developed is the transverse isotropic (TI) model, in which the principal axis associated with the vertical resistivity (Rv) is perpendicular to the bedding plane. This model is in widespread use in commercial products by oilfield service companies to provide resistivity anisotropy and the dip of a formation.
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