There is a long history of wanting to provide a petrophysical answer, comprising at least porosity and saturation, either in real time or within, at most, a couple of hours after logging. Past attempts to provide such a product have been plagued by the need to define numerous parameters and well zonations that would ordinarily be selected by a skilled interpreter. With the introduction of elemental concentration logs obtained from nuclear capture spectroscopy tools, the number of interpretation parameters can be dramatically reduced. This is because the accuracy of the lithology and matrix properties is a significant advance over values determined from conventional techniques. Consequently, it is much easier to directly apply scientific conductivity and permeability models for petrophysical evaluation.

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