Abstract
An important element of the geological modeling of oil reservoirs is represented by determining of the mineralogical composition and rock types as part of the reservoir characterization process. In the paper we provide a comprehensive mineralogo-petrographic study based on petrographic observations and X-rays diffraction investigations made on several Miocene rock samples collected in the wells spudded in an oil field belonging to the Getic Basin. Getic Basin is a prolific petroleum province in Romania and belongs to petroleum systems of the Carpathian Foredeep. The oil exploration in the Getic Basin started more than 100 years ago and resulted in thousands of wells drilled and tens of fields discovered. The oil field is located in the Gorj County, geologically belongs to the internal zone of the Getic Basin, and is a faulted anticline with hydrocarbon accumulations in Burdigalian and Sarmatian deposits. The petrographic study led to the interpreting of the rock samples analyzed as epiclastic sedimentary rocks represented by conglomerates, breccias, sands, sandstones, claystones and marlstones, and carbonate rocks (limestones). X-rays diffraction investigations indicated the phyllosilicates (smectite and illite) as main minerals in the Sarmatian samples, while in the Burdigalian samples were found as main minerals: quartz, feldspars and carbonate minerals. The paper provides detailed information (like petrographic types, composition and microtexture) on the Miocene reservoir rocks belonging to the Getic Basin. Also the data obtained may be used as basis for future reservoir modeling studies in the region.
Highlights
Geological modeling of hydrocarbon reservoirs consists of several processes of which it stands out the geological characterization of the reservoirs
The geological characterization process of hydrocarbon reservoirs is a process in which an interdisciplinary scientific model is created that integrates and reconciles different types of geological and hydrodynamic information from the pore scale where petroleum is reservoired to the sedimentary basin scale
Getic Basin could be divided in two sub-basins: Eastern Getic Basin with characters similar to the Eastern Carpathians Foredeep, and Western Getic Basin corresponding to a Paleogene to Early Miocene strike-slip basin developed on the contact zone between the Southern Carpathians and Moesian Platform
Summary
Geological modeling of hydrocarbon reservoirs consists of several processes of which it stands out the geological characterization of the reservoirs. It was conducted a detailed characterization of the samples studied in terms of petrographic types, composition and microtexture, because as it is well known that such details cannot be provided by geophysical investigations. Getic Basin is a major geological unit in Romania with a complex tectonic evolution, evolving as foredeep of the Southern Carpathians during Cretaceous to Paleogene period. The complicated tectonic evolution of the Getic Basin varying from extension phase (Paleogene – Early Miocene) to compression phase (Middle Miocene - Early Sarmatian) was finalized by thrusting over Moesia during the Middle Miocene. [1,2,3]
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