Unlike the petroleum which has been awaking the attention of the Romanian scientists since the end of the XIX-th century (Pilide, C.L.-1877, Cobalcescu, G.-1887) and the beginning of the XX-th century (Poni, P.-1900-1901 Edeleanu, L.-1907), geochemistry have been developing since `80 years and especially after 1990, when theoretical considerations joined modern technologies for oil and rock analyses.

Today we are at the same level like similar laboratories in the world because of the results obtained with the new generation tools.

There are relatively little geochemical information published in the last years on the characteristics of oils and their potential source rocks from Romania. This paper presents the first detailed data for oils from the western part of Romanian Getic Depression. It used gas-chromatography-mass spectrometry to obtain various biomarker ratios and isotopic analysis.

The Getic Depression constitutes the Tertiary foredeep developed in front of the Southern Carpathians and it lies from Dambovita Valley (in the east) to the Danube River (in the west), whereas in the south, down to the Pericarpathian Fault which delimits it from the Moesian Platform. For this work we selected the western part of Getic Depression between Jiu River (West) and Cerna River (East). 57 oils were analyzed after the fractionation into saturated hydrocarbons, aromatic hydrocarbons and nitrogen, sulfur and oxygen (NSO) compound fractions, in order to get the distribution of the biomarkers.

The results of these investigations were been evaluated and interpreted using the new PC Soft: IGI. We characterized the various oil families in more detail, observing a special and interesting case of one of the analyzed fields (Ticleni) and we say now, that we better understand the petroleum system in the studied area.

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