GEOCHEMICAL CHARACTERISTIC OF THE SILURIAN ROCKS FROM THE EASTERN PART OF MOLDAVIAN PLATFORM (ROMANIA), Carpathian Journal of Earth and Environmental Sciences, February 2021, Vol. 16, No. 1, p. 17 – 30; Doi:10.26471/cjees/2021/016/152 - Carpathian Journal of Earth And Environmental Sciences

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Octavian COLŢOI^1*, Flori CULESCU² & Gilles NICOLAS³

¹Ministry of Environment, 12 Libertatii Blv, Bucharest, Romania, coltoi_o@yahoo.com

²National corestore, Geological Institute of Romania, 1 Caransebes St., Bucharest, Romania,

³Formely TOTAL, Ex-Department Fluid and Organic Geochemistry, TOTAL, Avenue Larribau, CSTJF, PAU, FRANCE

GEOCHEMICAL CHARACTERISTIC OF THE SILURIAN ROCKS FROM THE EASTERN PART OF MOLDAVIAN PLATFORM (ROMANIA), Carpathian Journal of Earth and Environmental Sciences, February 2021, Vol. 16, No. 1, p. 17 – 30; Doi:10.26471/cjees/2021/016/152

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The scope of this paper is to assess the hydrocarbon potential of Silurian, respectively, the maturity of this stratigraphical interval, based, especially, of the geological and geophysical data derived from eight boreholes located in the north-eastern part of Moldavian Platform - Romania. The main conclusion is that the organic matter contents measured in the core and cutting samples of the different wells are low with the Organic Carbon (TOC) (residual) mainly clearly lower than 1%. Due to the poorness of the sample and the high maturity the petroleum potential and organic matter cannot be assessed. Estimation of the initial TOC allows to differentiate a richer interval at 24 – 27m thick below the top of Silurian. It shows higher TOC with estimated initial TOC reaching 3.6 % weight at the most. The maturity is high and shows a rapid increase with depth between around 2% at 200m and 4% eq. VRr at 1100m. An estimation of the eroded cap-rock is of around 3000m. Mineral carbon content obtained from Rock Eval permits to separate two lithological intervals: carbonated in the upper part (thickness of 250-300m), argillaceous in the lower part.