Fast inversion of triaxial induction data in dipping crossbedded formations

ABSTRACTThe tensor type measurements acquired by triaxial induction tools greatly expand the data sensitivity to formation properties, enabling the extraction of not only the resistivity but also the resistivity anisotropy and dip of the formation. The first and most popular anisotropic resistivity model for the interpretation of triaxial induction data is the transversely isotropic (TI) model in which the lamination planes are assumed to be parallel to the bedding planes. Image data and outcrops indicate that crossbedding occurs in multiple depositional environments. Modeling results have shown that the presence of crossbedding can have a considerable effect on the response of triaxial induction. Therefore, using the TI model in crossbedded formations can cause large errors in the estimation of the formation resistivity and dip. However, the strong effect suggests the possibility of performing a crossbed interpretation with triaxial induction data. We have developed an inversion method based on a fast fo...

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