Lower Cretaceous black shales of the Western Carpathians,Czech Republic: Palynofacies indication of depositional environment and source potential for hydrocarbons |
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| Institution: | 1. GEOTOP, Université du Québec à Montréal, Montréal, Québec H3C 3P8, Canada;2. Department of Earth Sciences, Brock University, St. Catharines, Ontario L2S 3A1, Canada;3. Alfred Wegener Institute Helmholtz Centre for Polar and Marine Research, 27568 Bremerhaven, Germany;1. Geology Department, Faculty of Science, Tanta University, Tanta 31527, Egypt;2. Clark Geological, 6420 Becker Dr., Loomis, California, USA |
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| Abstract: | Uppermost Jurassic and Lower Cretaceous strata of the Silesian Nappe of the Outer Western Carpathians contain large amounts of shale, which can, under favourable conditions, become source rocks for hydrocarbons. This study analysed 45 samples from the area of Czech Republic by the means of palynofacies analysis, thermal alteration index (TAI) of palynomorphs and total organic carbon (TOC) content to determine the kerogen type, hydrocarbon source rock potential, and to interpret the depositional environment. Uppermost Jurassic Vendryně Formation and Lower Cretaceous Formations (Tě?ín Limestone, Hradi?tě and Lhoty) reveal variable amount of mostly gas prone type III kerogen. Aptian Ve?ovice Formation has higher organic matter content (over 3 wt.%) and oil-prone type II kerogen. Organic matter is mature to overmature and hydrocarbon potential predisposes it as a source of gas. Aptian black claystones of the Ve?ovice Fm. are correlatable with oceanic anoxic event 1 (OAE1). |
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| Keywords: | Western Carpathians Early Cretaceous Palynofacies Organic carbon Oceanic anoxic event Hydrocarbons |
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