Abstract
ABSTRACT Elemental logs can be combined with mineral models to provide significant information for geological description and evaluation of downhole formations. Mineral compositions from geochemical logs can be applied to a variety of lithologies, stratigraphie settings, and geological ages including those of the Middle East. The most abundant element concentrations in the rock-forming minerals are obtained from the Geochemical Logging Tool (GLT*). This tool measures natural, activation, and prompt neutron capture gamma-ray spectra. In addition to the traditional potassium, thorium, and uranium from natural gamma-ray spectrometry, a direct measurement of aluminum concentration is provided. A geochemically-based closure model is used to derive silicon, calcium, iron, sulfur, gadolinium, and titanium concentrations. The concentration of these elements, expressed in weight percent, significantly improves identification of mineral composition, and allows the estimation of important formation properties -- an excellent basis for a broad range of applications useful to petroleum engineers, geologists, and petrophysicists.
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