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SUMMARYThe objective of the research is a reference framework set of petrophysical data characterizing the Devonian siliciclastic sediments of the study area. The characterization workflow includes three main stages: the first is the lithological typification from core description, the second is matching of the identified lithotypes with their petrophysical properties and the third is testing the model against wireline logging data. The core from selected wells was described for lithological typification and studied with routine and special core analysis procedures in the laboratory. It is well known that shale content changes the physical properties of the rock, hence the results of the particle size distribution analysis were used to group the samples into classes based on the grain size subject to the ratio of clay material in the rock fabric. The normal trend is observed for increase in shale content with smaller grain size. Based on the lithological description all the samples were grouped into three petrophysical classes then characterized by their own petrophysical relations and constants. This approach is based on the fact that the shave volume as opposed to grain size can be estimated from well logs and then applied to reservoir characterization and differentiation.

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