In the development phase of an oil and gas reservoir, petrophysical characterization of sedimentary formations that compose the reservoirs assists both drilling and reservoir engineers on the important task of maximize the production of hydrocarbons. The larger goal is to minimize the costs of production operations. In this context, the records obtained by geophysical well-logging tools are used for the formations evaluation. In this research project, we discussed the methodology for estimation of mineralogical composition of sedimentary formations from geophysical logging for a single well. We will apply this methodology in the upper part of the Macaé formation, which the Namorado Reservoir is inserted, located in the Campos Basin, the north coast of the State of Rio de Janeiro. We will use some of the geophysical well-logs from the data set 'Campo Escola Namorado', ceded by ANP to the Brazilian institutions of education and research. In addition to geophysical well-logs, descriptions of core samples extracted from the wells, also contained in the data set 'Campo Escola Namorado', are fundamental to the mineralogical composition evaluation of the formations under investigation.


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