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DECIPHERING THE RESERVOIR ROCKS LITHOLOGY BY MINERALOGICAL INVESTIGATIONS TECHNIQUES FOR AN OILFIELD IN EASTERN GETIC DEPRESSION (ROMANIA)

Gheorghe Brănoiu

Abstract

Getic Depression is a mature and prolific petroleum province in the Carpathian Orogen. It belongs to a large group of petroleum systems in Romania, respectively Carpathian Foredeep. Getic Depression represents the foredeep of the Cretaceous to Paleogene Southern Carpathians. During the Paleogene to Early Miocene it has been affected by transtension due to the eastward movement of the Inner Carpathians. Finally, the basin has been inverted and thrusted over Moesia during the Mid-Miocene collision of the Carpathians. In the paper we provide a detailed core description based on the macroscopic and microscopic petrographic investigations and qualitative and quantitative analysis by X-ray diffraction of several cores in the Miocene reservoir rocks collected from different wells spudded in an oilfield belonging to Eastern Getic Depression. The petrographic study of the thin sections revealed the presence of epiclastic detrital rocks. We aimed to make a more detailed characterization of these rocks in terms of variety, composition and microstructures, such details as is known not being offered by geophysical investigations. Generally, the cores analyzed are composed of granoclasts (quartz, feldspars, micas), lithoclasts and bioclasts embedded in a fine-grained matrix of clay minerals and carbonate. The X-ray diffraction analyses revealed the presence in large quantity of the quartz, feldspars and carbonate minerals, and appreciable quantity of the phyllosilicates represented by illite and clinochlore. The paper brings new information on the Miocene rocks increasing degree of knowledge of the hydrocarbon reservoir rocks in the Eastern Getic Depression. Establishing global mineralogical composition, the rock type and textural characters have great importance because the Miocene (Burdigalian) deposits have proved an excellent quality as reservoir rocks.

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DOI resolver: doi.org/10.5593/sgem2018/1.1/s01.009

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