Hydrocarbon migration and entrapment in the Baltic Syneclise

Zdanaviciute, O.; Lazauskienė, Jurga

doi:10.1016/j.orggeochem.2004.01.016

Cited by 31 publications

(16 citation statements)

References 4 publications

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“…5, hydrocarbons present in the investigated Lower Paleozoic rocks are syngenetic, without any significant input of migrating bitumen. This agrees with the general opinion that only rocks of the eastern part of the Peribaltic Syneclise (the Latvian part) could be considered as a perspective oil sources since the western part is too mature (see Subsection "Extractability of rocks and group composition of the extracts") (Zdanaviciute and Lazauskiene, 2004).…”

Section: General Properties Of Organic Matter In Rocks From the Peribsupporting

confidence: 88%

“…Organic matter of lower thermal maturity is found in the eastern and northeastern parts of the Peribaltic Syneclise, which are situated in Lithuania, Latvia and Estonia (Zdanaviciute and Lazauskiene, 2004). In the Lower Palaeozoic rocks of the Polish part of the Peribaltic Syneclise, only small bitumen yields were found (Calikowski, 1984;Karnkowski, 1997Karnkowski, , 2003Schleicher et al, 1998).…”

Section: Introductionmentioning

confidence: 99%

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Geochemical characteristics of organic matter in the Lower Palaeozoic rocks of the Peribaltic Syneclise (Poland)

Skręt

Fabiańska

2009

Geochem. J.

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Organic matter occurring in Lower Palaeozoic rocks of variable lithology was investigated for its origin, depositional environment and thermal maturity. Samples from nine boreholes located in the Polish part of the Peribaltic Syneclise were collected for performing Rock-Eval Analysis, palynological investigation for Thermal Alteration Index (TAI), solvent extraction, preparative layer chromatography (PLC) and gas chromatography-mass spectrometry (GC-MS) of aliphatic and aromatic compound fractions. It was found that kerogen belongs to either type I or commonly, to type II. It derives from variable, planktonic and planktonic-bacterial primary organic matter deposited in dysoxic environments in the eastern part of the Syneclise and in anoxic/suboxic conditions in the western and central parts. Organic matter is in the thermal evolution stage from late diagenesis to advanced metagenesis. Correlation of biomarker parameters, TAI and Rock-Eval results show that the thermal maturity of organic matter falls into three regional groups, increasing from the north-east to the south-west along the crystalline basement of the Eastern European Platform. The organic matter contained in Ordovician and Cambrian sediments of the western part of the Syneclise is overmature, reaching metagenesis. This is most probably related to the activity of the Teisseyre-Tornquist Zone, where the Baltica and Eastern Avalonia paleocontinents collided during the Late Ordovician. It is also reflected in the profiles by elevated values of aromatic hydrocarbon and sulphur compound parameters, which show the highest levels of thermal maturity for organic matter present in the sediments of the Ordovician and Lower Silurian. Local influence of igneous intrusions on organic matter is also visible in changes in thermal maturity values at the direct contact with diabase dykes.

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Section: General Properties Of Organic Matter In Rocks From the Peribsupporting

confidence: 88%

Section: Introductionmentioning

confidence: 99%

Geochemical characteristics of organic matter in the Lower Palaeozoic rocks of the Peribaltic Syneclise (Poland)

Skręt

Fabiańska

2009

Geochem. J.

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“…RST28, Quantitative 3D modelling of hydrocarbon migration and accumulation has been carried out (Zdanaviciute and Lazauskiene, 2004). Oil generation in the Baltic Depression began at the end of the Silurian, with major oil generation occurring in Devonian and Early Permian times.…”

Section: Potential Reservoir Rocks and Sealsmentioning

confidence: 99%

“…Oil generation in the Baltic Depression began at the end of the Silurian, with major oil generation occurring in Devonian and Early Permian times. Silurian oil accumulations formed much later than Cambrian accumulations, at the end of the Hercynian when Silurian source rocks reached depths sufficient for organic matter maturity and oil generation (Zdanaviciute and Lazauskiene, 2004).…”

Section: Potential Reservoir Rocks and Sealsmentioning

confidence: 99%

The Petroleum Potential of the Silurian Succession in Lithuania

Zdanaviciute¹,

Lazauskienė

2007

Journal of Petroleum Geology

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Petroleum potential is associated with Silurian reefal and carbonate build‐ups in southern and central Lithuania where non‐structural traps (reef‐associated, lithologic‐stratigraphic and combined) have been identified in intervals of Late Wenlock, Late Ludlow and Early Pridoli ages. Three oilfields (Kudirka, Siaures Bliudziai and Lapgiriai) have so far been discovered in this area. In addition, oil flows have been reported at wells in the Bebirva, Saukenai, Bliudziai and Pavasaris accumulations. Reefal build‐ups and patch reefs dated as belonging to the Minija Regional Stage of the Early Pridoli, up to 88 m thick, are considered to be the most prospective for hydrocarbons, and all the discoveries so far made occur in this stratigraphic interval. New geochemical data indicate the presence of excellent Llandovery, Wenlock and Ludlow source rocks, composed of dark grey and black clayey marlstones and shales. Recent studies of the composition and maturation of Silurian source rocks indicate the predominance of sapropelic organic matter, present in higher amounts than in Cambrian and Ordovician source rocks. The maturity of Silurian source rocks increases from immature in eastern Lithuania to early oil‐phase in the centre and north, to peak oil generation in the west. Geochemical analyses of Silurian crude oils show that they are un‐ or only weakly biodegraded, in spite of their early emplacement (in the Palaeozoic) and the relatively low reservoir temperatures (40‐50°C). The results of these geochemical studies of the Silurian source rocks and oils, incorporated with available geological data, were used to predict the hydrocarbon potential of the Silurian succession in Lithuania. The succession is estimated to have generated as much as 5.8 B tons of hydrocarbons. Previous studies indicate that 100 million tons may have accumulated in patch reefs assigned to the Minija Regional Stage. Estimated oil in‐place at the known oilfields totals about 1.77 million tons.

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“…Several potential source rock horizons are present in the Lower Palaeozoic (Cambrian, Ordovician and Silurian) succession (Burchardt and Lewan 1990;Buchardt et al 1998;Więcław et al 2010a, b;Zdanaviciute and Lazauskiene 2004). The Upper Cambrian and Lower Ordovician (Tremadocian) strata contain the best source rocks, with low-organic sulphur, oil-prone Type-II kerogen and initial total organic carbon (TOC) contents up to 18 and 20 wt%, respectively (Buchardt et al 1998;Więcław et al 2010a, b;Kosakowski et al 2010).…”

Section: Introductionmentioning

confidence: 99%