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The AAPG/Datapages Combined Publications Database
AAPG Bulletin
Abstract
DOI: 10.1306/02071716194
Oil–
source
-rock correlation of the Lower Paleozoic petroleum system in the Baltic Basin (northern Europe)
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Shengyu Yang,1 Hans-Martin Schulz,2 Niels Hemmingsen Schovsbo,3 and Jørgen A. Bojesen-Koefoed4
1Section 3.2, Organic Geochemistry, Helmholtz Centre Potsdam–GFZ German Research Centre for Geosciences, Telegrafenberg, D-14473 Potsdam, Germany; [email protected]
2Section 3.2, Organic Geochemistry, Helmholtz Centre Potsdam–GFZ German Research Centre for Geosciences, Telegrafenberg, D-14473 Potsdam, Germany; [email protected]
3Geological Survey of Denmark and Greenland, Øster Voldgade 10, DK-1350 Copenhagen K, Denmark; [email protected]
4Geological Survey of Denmark and Greenland, Øster Voldgade 10, DK-1350 Copenhagen K, Denmark; [email protected]
ABSTRACT
The correlation of lower Paleozoic marine source
rocks
with reservoired oils by biomarkers is complex because of the uniform early Phanerozoic biomass (bacteria and algae) and the lack of land plant and animal input. Accordingly, the main
source
rocks
for the most prolific oil province in the Baltic Basin are still a matter of debate.
The 10 source
rocks
and 15 oil samples from 5 northern European countries bordering the Baltic Sea Basin were analyzed by gas chromatography (GC) with flame ionization detector, GC–mass spectrometry (GCMS), and GCMS/MS to detect acyclic isoprenoids and aliphatic, aromatic, and nitrogen, sulfur, and oxygen biomarkers. Chemometric tools were applied to screen for meaningful
source
- and age-related biomarkers and to highlight genetics. Extended tricyclic terpane ratios, C24 tetracyclic terpane/C26 tricyclic terpane ratios, and relative C29 sterane concentrations are considered the most promising biomarkers in differentiating Llandovery shales from Cambrian to Ordovician Alum Shale and for correlation with expelled oil. The uranium irradiation–related C26–C28 triaromatic-steroid concentrations provide possible distinguishing criteria for the
source
potential of the different Alum Shale units. Enhanced oil maturation by volcanic intrusion is highlighted by sterane biomarkers and polycyclic aromatic hydrocarbons.
The Alum Shale is here considered the main source
rock for oil accumulations in lower Paleozoic
reservoirs
of the Baltic Basin. Oil seepage occurring in Ordovician limestone was mainly generated by the
Middle
Cambrian Alum Shale, and
Middle
Cambrian sandstone
reservoirs
were mainly sourced by Upper Cambrian and Lower Ordovician Alum Shale with higher maturity. Considerations about the assessment of migration distance are based on carbazole concentrations and C29 sterane isomerization.
Advanced studies to unravel detailed lower Paleozoic oil–source
-rock correlations are based on meaningful biomarkers, offer approaches to significantly reduce the exploration risk in this area, and could be applied to similar early Paleozoic petroleum systems in other
basins
.
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