Molecular and isotopic compositions and origin of natural gases from Cambrian and Carboniferous-Lower Permian reservoirs of the onshore Polish Baltic region

Kotarba, Maciej J.; Nagao, Keisuke

doi:10.1007/s00531-014-1063-0

Int J Earth Sci (Geol Rundsch)

2014

DOI: 10.1007/s00531-014-1063-0

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Molecular and isotopic compositions and origin of natural gases from Cambrian and Carboniferous-Lower Permian reservoirs of the onshore Polish Baltic region

Maciej J. Kotarba

Keisuke Nagao

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Cited by 13 publications

(2 citation statements)

References 61 publications

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“…The precision of concentration measurements was equal: HC ± 0.1 ppm; CO 2 : ±0.01 vol%; O 2 : ±0.02 vol% for concentration \5 vol% and ±0.1 vol% for concentration [5 vol%; and N 2 : ±0.05 vol% for concentration \10 vol% and ±0.1 vol% for concentration [10 vol%. The C HC (Bernard parameter) and CO 2 -CH 4 index (CDMI), used to decipher the origin of sediment gases (Bernard et al 1978;Kotarba and Nagao 2015), were calculated as follows:…”

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Processes affecting molecular and stable isotope compositions of sediment gas in estuarine waters along the southern Baltic coast (Poland)

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This paper investigates the molecular and stable isotope compositions of sediment gases from seven coastal lakes along the southern Baltic coast in Poland. The aim is to extend the knowledge of the genesis and distribution of microbial gases in the zone of mixing of fresh and salt waters with special attention to the effect of salinity, climate-related seasonality, and vertical sediment mixing. We found differences in the compositions of gas between the studied lakes and within each lake. These differences are mainly controlled by lake water depth and the presence of macrophytes. Due to the dissolution of rising bubbles in highly oxygenated water, the concentrations of CH 4 and CO 2 show up to 67% decline along the water column in favor of N 2 and O 2 . On the other hand, in vegetated parts of the lakes, the CH 4 is depleted in favor of CO 2 , and the residual CH 4 and CO 2 are enriched in 13 C. Despite the fact that the coastal lakes display highly oxidizing conditions in the water column and that the bottom sediments are mixed by wind waves the CH 4 reveals rather low oxidation. On the basis of the CH 4 /N 2 ratio we established that there are differences in the intensity of ebullition throughout the lakes. Higher intensities of ebullition were found in shallower parts of the lakes. Salinity has no effect on the stable C and H isotope composition of sediment gas. It seems, however, that salinity affects the molecular composition of hydrocarbons via preferential oxidation of CH 4 under higher salinity conditions.

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“…where CH 4 , C 2 H 6 , C 3 H 8 , and CO 2 denominate volumetric percentages of the gases (Kotarba and Nagao 2015).…”

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Processes affecting molecular and stable isotope compositions of sediment gas in estuarine waters along the southern Baltic coast (Poland)

et al. 2016

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Origin and secondary processes in petroleum in the eastern part of the Polish Outer Carpathians

Więcław

Bilkiewicz

Kotarba

et al. 2019

Int J Earth Sci (Geol Rundsch)

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Origin of hydrocarbon and noble gases, carbon dioxide and molecular nitrogen in Devonian, Pennsylvanian and Miocene strata of the Polish Lublin and Ukrainian Lviv basins, southern part of the Upper Silesian Coal Basin and western part of the Carpathian Foredeep (Poland)

Kotarba

Sumino

Nagao

2019

Applied Geochemistry

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Molecular and isotopic compositions and origin of natural gases from Cambrian and Carboniferous-Lower Permian reservoirs of the onshore Polish Baltic region

Cited by 13 publications

References 61 publications

Processes affecting molecular and stable isotope compositions of sediment gas in estuarine waters along the southern Baltic coast (Poland)

Processes affecting molecular and stable isotope compositions of sediment gas in estuarine waters along the southern Baltic coast (Poland)

Origin and secondary processes in petroleum in the eastern part of the Polish Outer Carpathians

Origin of hydrocarbon and noble gases, carbon dioxide and molecular nitrogen in Devonian, Pennsylvanian and Miocene strata of the Polish Lublin and Ukrainian Lviv basins, southern part of the Upper Silesian Coal Basin and western part of the Carpathian Foredeep (Poland)

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