Initial geologic hydrocarbon resources of the Laptev Sea shelf

Safronov, A. N.; Sivtsev, A.I.; Chalaya, O. N.; Зуева, И. Н.; Sokolov, A. N.; Fradkin, G S

doi:10.1016/j.rgg.2013.07.015

Cited by 5 publications

(1 citation statement)

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“…Шельф моря Лаптевых имеет статус перспективной нефтегазоносной провинции [27]. По данным многоканальной сейсморазведки, в северной и северо-восточной части шельфа моря Лаптевых были обнаружены потенциальные залежи/ловушки газа [28].…”

Section: район исследованияunclassified

Elemental speciation of the sediments from cold methane seeps on the Laptev Sea shelf

Oberemok,

Guseva,

Moiseeva

et al. 2024

IZVESTIYA

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Relevance. The lack of elemental speciation data in the bottom sediments of the Laptev Sea, as well as the absence of its quantitative changes in occurrence forms in response to methane emissions. Aim. To assess changes in the elemental speciation in areas where methane-containing fluids are discharged. Objects. Nine samples of bottom sediments taken from three horizons of one “cold seep” and two background stations of the outer shelf-continental slope of the Laptev Sea during the AMK-82 expedition aboard R/V “Academician M.V. Keldysh” in autumn 2020. Methods. Sequential extraction BCR (the European Community Bureau of Reference) was performed to determine the elemental speciation in surface sediments; the residual fraction was determined by dissolving in nitric acid. The obtained fraction solutions were analyzed by ICP-MS (NexIon 300D, Perkin Elmer, Waltham, MA, USA), Pyrolysis (Rock-Eval 6 Turbo, Vinci Technologies). Results. The trend towards an increase in element mobility has been identified as a result of a shift in geochemical conditions that is presumably caused by the authigenic carbonate and sulfide formation. Moreover, the increase in the recoverable fraction (associated only with Fe oxides/hydroxides) is highlighted. We assume that the process of unloading methane-containing fluids plays a significant role in enrichment of authigenic carbonates U, Ni, Zn Co, oxides Fe – Sn and V, authigenic sulfides – Co, Mn and W. We also assume the potential formation of chalcopyrite as an authigenic sulfide in methane discharge areas.

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Section: район исследованияunclassified

Elemental speciation of the sediments from cold methane seeps on the Laptev Sea shelf

Oberemok,

Guseva,

Moiseeva

et al. 2024

IZVESTIYA

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Problems of the geology and petroleum potential of the Arctic (in lieu of a preface)

Dobretsov

Конторович

2013

Russian Geology and Geophysics

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Sediment Organic Matter in Areas of Intense Methane Release in the Laptev Sea: Characteristics of Molecular Composition

Гринько

Goncharov

Shakhova

et al. 2020

Russian Geology and Geophysics

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—We present results of study of the molecular composition of organic matter (OM) in the bottom sediments of the Laptev Sea by gas chromatography–mass spectrometry, isotope gas chromatography–mass spectrometry, and Rock-Eval pyrolytic analysis. The OM of all collected sediment samples shows a significant terrigenous contribution. Compounds that are biomarkers of methanotrophic microorganisms are also found. A positive correlation between the contents of the studied biomarkers and the contents of pelite and total organic carbon is observed at the sites with documented intense methane bubbling. For example, the average content of C30 hopenes at the “methane” stations is twice higher than that at the “background” ones. The average content of C32 αβ-hopanes in sediment samples from the methane seepage area is 1.5 times higher than that at the background stations. We suggest that the increased C30 αβ-hopane content (~1.5 times higher within the methane seepage area) and the decreased moretane index relative to the C31 hopane index are due to the inflow of OM of petroleum origin. The presence of biphenyl in sediments indicates its petroleum origin, which supports our assumption of the migratory nature of petroleum hydrocarbons in the methane seepage area. Triterpenoids found in the sediment OM indicate diagenetic bacterial transformation of OM in the methane seepage areas, which shows that methane has been released for a long time. We assume the intense activity of the consortium of methanotrophs and sulfate reducers in the methane seepage areas.

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Initial geologic hydrocarbon resources of the Laptev Sea shelf

Cited by 5 publications

References 0 publications

Elemental speciation of the sediments from cold methane seeps on the Laptev Sea shelf

Elemental speciation of the sediments from cold methane seeps on the Laptev Sea shelf

Problems of the geology and petroleum potential of the Arctic (in lieu of a preface)

Sediment Organic Matter in Areas of Intense Methane Release in the Laptev Sea: Characteristics of Molecular Composition

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