Scholarly record

COMPARATIVE ANALYSIS OF RESERVOIR PARAMETERS OF FLYSCH SANDSTONES IN THE S-8 WELL (WESTERN CARPATHIANS, SOUTHERN POLAND)

Dr. Grzegorz Machowski, Ewa Pstrucha, Artur KrzyЕјak

Abstract

This study focuses on petrophysical characteristics of flysch sandstones in the S-8 well section, located in the western part of the Polish Outer Carpathians (southern Poland). A number of laboratory tests were performed with application of the mercury injection capillary pressure, low field nuclear magnetic resonance, X-ray diffraction and pulse decay permeability measurements. Laboratory tests results were compared with the well logging interpretation. The laboratory analyses were conducted on core samples from the S-8 well from the depth interval of 777 пїЅ 2000 meters. The analysis of mineralogical composition shows relatively high content of quartz and carbonates (63% on average) and low proportion of clay minerals (below 20%), which discloses high values of calculated brittleness indexes (0.8 on average). The results of the laboratory methods allowed for stating that the studied sandstones reveal very low values of the effective porosity (1.38 % on average), high values of the irreducible water saturation index (0.6 on average) and extremely low values of permeability (0.4 nD on average). The results of the applied methods imply that the analysed sandstones have features of unconventional reservoir rocks with high potential for the hydraulic fracturing.

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