DBPapers
DOI: 10.5593/SGEM2016/B13/S06.114

POROSITY AND PERMEABILITY OF THE MAIN DOLOMITE OIL-BEARING ROCKS IN THE S-1 WELL (WESTERN POLAND)

E. Pstrucha, G. Machowski, A. Krzyzak
Tuesday 6 September 2016 by Libadmin2016

References: 16th International Multidisciplinary Scientific GeoConference SGEM 2016, www.sgem.org, SGEM2016 Conference Proceedings, ISBN 978-619-7105-57-5 / ISSN 1314-2704, June 28 - July 6, 2016, Book1 Vol. 3, 905-912 pp

ABSTRACT
The purpose of the study was to determine the petrophysical characteristics of the Zechstein Main Dolomite (Ca2) carbonates in the S-1 borehole section. The S-1 well is located in the northern part of the Fore-Sudetic Monocline (western Poland), where numerous oil and gas fields have been discovered within the Polish Zechstein Basin. Mercury intrusion capillary pressure, high-resolution X-ray computed microtomography and gas permeability measurements were conducted on 26 samples from the depth interval of 3171 – 3220 meters. The method used enabled detailed characterization of the pore space geometry and estimation of the most important reservoir parameters – effective porosity and permeability. The rock samples reveal the porous, mainly unimodal type of the reservoir space with predominant proportion of mesopores (0.5 – 2.5 μm) in the pore space. It determines relatively high values of effective porosity (up to 27%) and low values of permeability (below few millidarcy). The results derived from applied methods reveal satisfactory degree of correlation. Appropriate identification of these two petrophysical parameters of the formation is a key element for the optimization of the reservoir development.

Keywords: Main Dolomite, mercury porosimetry, porosity, permeability