Indications for an Active Petroleum System in the Laptev Sea, Ne Siberia

Cramer, Bernhard; Franke, Dieter

doi:10.1111/j.1747-5457.2005.tb00088.x

Cited by 49 publications

(53 citation statements)

References 17 publications

(19 reference statements)

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“…Given that we do not fully Figure 8. Selected bound gas samples with compound-specific carbon isotopic data plotted on a methane carbon isotope versus ethane-propane isotopic separation chart: (a) Offshore Gulf of Mexico bound microdesorption compound-specific isotopic dataset-microbial [13]; (b) Offshore Gulf of Mexico bound microdesorption methane isotope versus total bound microdesorption hydrocarbon gas (µmol/kg) [13]; (c) India [61], Lapev Sea [60] and Barents Sea [62] adsorbed acid extraction compound-specific isotopic dataset-assumed to be thermogenic.…”

Section: Discussionmentioning

confidence: 99%

“…Published bound acid extraction compound-specific isotopic data from offshore India [61], Lapev Sea [60] and the Barents Sea [62] have been plotted on the author's methane carbon isotope versus ethane-propane isotopic separation chart (Figure 8c). The Barents Sea samples plot within the Early Mature to Mature region with a few having heavier methane isotopes suggestive of a terrestrial sourcing component.…”

Section: Compound-specific Isotopesmentioning

confidence: 99%

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Evaluation of Near-Surface Gases in Marine Sediments to Assess Subsurface Petroleum Gas Generation and Entrapment

Abrams

2017

Geosciences

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Gases contained within near-surface marine sediments can be derived from multiple sources: shallow microbial activity, thermal cracking of organic matter and inorganic materials, or magmatic-mantle degassing. Each origin will display a distinctive hydrocarbon and non-hydrocarbon composition as well as compound-specific isotope signature and thus the interpretation of origin should be relatively straightforward. Unfortunately, this is not always the case due to in situ microbial alteration, non-equilibrium phase partitioning, mixing, and fractionation related to the gas extraction method. Sediment gases can reside in the interstitial spaces, bound to mineral or organic surfaces and/or entrapped in carbonate inclusions. The interstitial sediment gases are contained within the sediment pore space, either dissolved in the pore waters (solute) or as free (vapour) gas. The bound gases are believed to be attached to organic and/or mineral surfaces, entrapped in structured water or entrapped in authigenic carbonate inclusions. The purpose of this paper is to provide a review of the gas types found within shallow marine sediments and examine issues related to gas sampling and extraction. In addition, the paper will discuss how to recognise mixing, alteration and fractionation issues to best interpret the seabed geochemical results and determine gas origin to assess subsurface petroleum gas generation and entrapment.

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Section: Discussionmentioning

confidence: 99%

Section: Compound-specific Isotopesmentioning

confidence: 99%

Evaluation of Near-Surface Gases in Marine Sediments to Assess Subsurface Petroleum Gas Generation and Entrapment

Abrams

2017

Geosciences

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“…Charge Probability.-Natural gas chimneys have been observed on seismic profiles throughout the study area (Cramer and Franke, 2005), but source rocks in the Laptev Sea Shelf Province have not been identified. Possible source rocks might include (1) Lower Cretaceous gas-prone coaly and carbonaceous strata, (2) synrift, uppermost Cretaceous and Paleogene coaly and carbonaceous continental rocks, and (3) Paleogene (Eocene) organic-rich mudstones deposited during major marine flooding events.…”

Section: Geological Analysis Of Assessment Unit Probabilitymentioning

confidence: 99%

“…Most seeps that have high methane contents occur within the East Laptev Horst AU, but no source rocks have yet been identified. Analyses of natural gas collected from bottom sediment and nearbottom waters from western and northern parts of the Laptev Sea Shelf indicate the presence of mature marine source rocks, presumably of Paleogene age and oil-prone (Cramer and others, 2001;Cramer and Franke, 2005). Postulated source rocks include oil-prone Upper Jurassic marine mudstone and Paleozoic, Lower Cretaceous, and uppermost Cretaceous to Paleogene gas-prone coaly and carbonaceous source rocks.…”

Section: Source Rocksmentioning

confidence: 99%

“…Geologic time scale is that of Gradstein and others (2004). Data from Cramer and others (2001), Cramer and Franke (2005), others (2001, 2004), Grantz and others (2001), Kaplan and others (1973), Kim and others (1999), Kos'ko and Trufanov (2002), Matykhin and Sokolov (1998), Sekretov (1999), Surkova (1987), Yakovlev and Koporulin (1996), and Zakharov and others (1983). The 2008 Circum-Arctic Resource Appraisal turbidites.…”

Section: Geology and Assessment Of Undiscovered Oil And Gas Resourcesmentioning

confidence: 99%

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Geology and assessment of undiscovered oil and gas resources of the Laptev Sea Shelf Province, 2008

Klett¹,

Pitman²

2017

Professional Paper

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Seismostratigraphy of the Siberian Sector of the Arctic Ocean and adjacent Laptev Sea Shelf

2014

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A new seismostratigraphic model has been established within the Arctic Ocean adjacent to the East Siberian Shelf on the basis of multichannel seismic reflection data acquired along a transect at 81°N. Ages for the sedimentary units were estimated via links to seismic lines and drill site data of the US Chukchi Shelf, the Lomonosov Ridge, and the adjacent Laptev Shelf. Two distinct seismic units were mapped throughout the area and are the constraints for dating the remaining strata. The lower marker unit, a pronounced high-amplitude reflector sequence (HARS), is the most striking stratigraphic feature over large parts of the Arctic Ocean. It indicates a strong and widespread change in deposition conditions. Probably, it developed during Oligocene times when a reorientation of Arctic Plates took place, accompanied by the gradual opening of the Fram Strait, and a widespread regression of sea level. The top of the HARS likely marks the end of Oligocene/early Miocene (23 Ma). An age estimate for the base of the sequence is less clear but likely corresponds to base of Eocene (˜56 Ma). The second marked unit detected on the seismic lines parallels the seafloor with a thickness of about 200 ms two-way travel time (160 m). Its base is marked by a change from a partly transparent sequence with weak amplitude reflections below to a set of continuous high-amplitude reflectors above. This interface likely marks the transition to large-scale glaciation of the northern hemisphere and therefore is ascribed to the top Miocene (5.3 Ma).

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Indications for an Active Petroleum System in the Laptev Sea, Ne Siberia

Cited by 49 publications

References 17 publications

Evaluation of Near-Surface Gases in Marine Sediments to Assess Subsurface Petroleum Gas Generation and Entrapment

Evaluation of Near-Surface Gases in Marine Sediments to Assess Subsurface Petroleum Gas Generation and Entrapment

Geology and assessment of undiscovered oil and gas resources of the Laptev Sea Shelf Province, 2008

Seismostratigraphy of the Siberian Sector of the Arctic Ocean and adjacent Laptev Sea Shelf

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