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Oil-bearing inclusions in vein quartz and calcite and,bitumens in veins: Testament to multiple phases of hydrocarbon migration in the Barrandian basin (lower Palaeozoic), Czech Republic
Authors:V. Suchý  ,P. Dobe&scaron  ,I. Sý  korová  ,V. Machovič,M. Stejskal,J. Kroufek,J. Chudoba,L. Matějovský  ,M. Havelcová  ,P. Matysová  
Affiliation:1. Jiránkova 1136/4, 163 00 Prague 6, Czech Republic;2. Czech Geological Survey, Klárov 3/131, P.O. Box 85, 118 21 Prague 1, Czech Republic;3. Institute of Rock Structure and Mechanics, Academy of Sciences of the Czech Republic, V Holešovi?kách 182 09, Prague 8, Czech Republic;4. Institute of Chemical Technology, Technická 5, 166 28 Prague 6, Czech Republic
Abstract:The petroleum charge history of the Barrandian basin was investigated by analysing quartz and calcite and organic phases that occur in veins and fractures cutting dolerite sills within the Liteň Formation (Silurian). The geochemical characteristics of fluid inclusions trapped in vein quartz and calcite, vein bitumens and adjacent potential source rocks when combined with burial and thermal history data reflect the presence of at least three separate hydrocarbon charge episodes. Solid highly reflecting (Rmax = 0.92–1.49%) bitumen provides information on the first and oldest episode of oil migration. The precursor oil was probably derived relatively early during diagenesis from nearby organic-rich sediments and was subsequently thermally altered to form the solid bitumen.
Keywords:Hydrocarbons   Fluid inclusions   Bitumen   Veins   Diagenesis   Petroleum migration   Petroleum source rock   Lower Palaeozoic
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