Origin of oils accumulated in the Middle Cambrian reservoirs of the Polish part of the Baltic region

• Autorzy: Kowalski A. , Więcław D. , Kotarba M. J.
• Języki publikacji: EN

Abstrakty

EN

We have examined 21 samples of crude oils accumulated in the Middle Cambrian sandstone reservoirs from the Polish part of the Baltic region. All the crude oils have similar parameters and indices, which suggests generation from the same source rock. Evaporative fractionation and biodegradation processes were detected in oil collected from the B4-N1/01 borehole. All crude oils have high gravities and low-sulphur contents, less than 0.3 wt.%, which suggests that their source rock contained low-sulphur kerogen deposited in a clastic environment. A low asphaltenes content (below 0.3 wt.%) and high saturate/aromatic hydrocarbon ratios indicate long migration distances or high thermal maturities. The longest migration distance was probably attained by oils from the arnowiec and B16 deposits. The biomarker data indicate an algal origin for the source organic matter deposited under conditions of clastic sedimentation. The stable carbon isotope data support this observation. The maturity of the oils analysed varies from ca. 0.75 to ca. 1.05% on the vitrinite reflectance scale. Unlike the B6, B16, Dbki and arnowiec accumulations, oils from the B3 and B4 accumulations reveal the lowest maturity.

Słowa kluczowe

EN

Baltic Region; Lower Paleozoic; oil origin; biomarkers; stable carbon isotopes; oil-oil correlation

• Wydawca: Państwowy Instytut Geologiczny - Państwowy Instytut Badawczy
• Czasopismo: Geological Quarterly
• Rocznik: 2010
• Tom: Vol. 54, No 2
• Strony: 205--216
• Opis fizyczny: Bibliogr. 59 poz., tab., wykr.

Twórcy

autor

Kowalski A.

autor

Więcław D.

autor

Kotarba M. J.

• Faculty of Geology, Geophysics and Environmental Protection, AGH University of Science and Technology, Mickiewicza 30, PL-30-059 Kraków, Poland,

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