DBPapers
DOI: 10.5593/SGEM2015/B11/S1.037

MINERALOGICAL AND PETROGRAPHIC CHARACTERISTICS OF THE RESERVOIR ROCKS FROM CALINESTI-OARJA OIL FIELD (GETIC DEPRESSION, ROMANIA)

G.A. Branoiu
Tuesday 4 August 2015 by Libadmin2015

References: 15th International Multidisciplinary Scientific GeoConference SGEM 2015, www.sgem.org, SGEM2015 Conference Proceedings, ISBN 978-619-7105-31-5 / ISSN 1314-2704, June 18-24, 2015, Book1 Vol. 1, 291-298 pp

ABSTRACT
In the paper were analyzed several cores from reservoir rocks from the Calinesti-Oarja oil field by optical microscopy (thin sections) and X-ray diffraction (powders method). The study of the thin sections revealed the presence of epiclastic detrital rocks represented by polymictic sands and sandstones. Generally, the cores analyzed are composed of granoclasts (quartz, feldspars, and micas), lithoclasts and bioclasts in a fine clay-carbonate matrix. The X-ray diffraction analyses revealed the presence in large quantity of the siliciclasts, carbonate minerals, and the halite (probably related to the connate water). Also, the phyllosilicates both dioctahedral and trioctahedral are found in appreciable quantity being represented by illite and clinochlore.
The paper brings new information on the Calinesti-Oarja oil field increasing degree of knowledge of the reservoir rocks. Establishing global mineralogical composition, the rock type and textural characters have great importance because cores analyzed of Meotian age have proved an excellent quality for being reservoir rocks.

Keywords: mineralogical-petrographic observations, X-rays diffraction, Meotian deposits, Carpathian Foredeep, oil reservoirs

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