Evaluation and modelling of Tertiary source rocks in the central Arctic Ocean

Mann, Ute; Knies, Jochen; Chand, Shyam; Jokat, Wilfried; Stein, Rüdiger; Zweigel, Janine

doi:10.1016/j.marpetgeo.2009.01.008

Cited by 29 publications

(27 citation statements)

References 47 publications

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“…The latter is supported by Knies et al (2007), showing that the inorganic fraction of the total nitrogen content in surface sediments off Spitsbergen can be used as a proxy for terrestrial organic matter input. Furthermore, Mann et al (2009) compared the percentage of inorganic nitrogen (%N inorg = 100-%N org ) to the hydrogen index and maceral data in central Arctic Ocean Paleogene deposits under the assumption that N inorg in marine sediments is non-local, i.e. allochthonus and of terrestrial origin, and found that soil (terrestrial) organic matter contains ca.…”

Section: Endmember Mixing Modelmentioning

confidence: 99%

Towards an improved organic carbon budget for the western Barents Sea shelf

et al. 2014

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Abstract. There is generally a lack of knowledge on how marine organic carbon accumulation is linked to vertical export and primary productivity patterns in the Arctic Ocean. Despite the fact that annual primary production in the Arctic has increased as a consequence of shrinking sea ice, its effect on flux, preservation, and accumulation of organic carbon is still not well understood. In this study, a multi-proxy geochemical and organic-sedimentological approach is coupled with organic facies modelling, focusing on regional calculations of carbon cycling and carbon burial on the western Barents Shelf between northern Scandinavia and Svalbard. OF-Mod 3-D, an organic facies modelling software tool, is used to reconstruct and quantify the marine and terrestrial organic carbon fractions and to make inferences about marine primary productivity changes across the marginal ice zone (MIZ). By calibrating the model against an extensive set of sediment surface samples, we improve the Holocene organic carbon budget for ice-free and seasonally ice-covered areas in the western Barents Sea. The results show that higher organic carbon accumulation rates in the MIZ are best explained by enhanced surface water productivity compared to ice-free regions, implying that shrinking sea ice may reveal a significant effect on the overall organic carbon storage capacity of the western Barents Sea shelf.

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Section: Endmember Mixing Modelmentioning

confidence: 99%

Towards an improved organic carbon budget for the western Barents Sea shelf

et al. 2014

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“…The best-fit model that resulted in the onset of generation by the Late Neogene on the Lomonosov Ridge required a palaeoheat-flow of 110 mW m 22 (Fig. 49.9), a conclusion arrived at independently by Mann et al (2009). Such high heat flow has been recognized near the modern Gakkel Ridge in the Eurasia Basin (Drachev et al 2003), but is substantially higher than any reasonable model for palaeoheat-flow in the Neogene for the Lomonosov microcontinent.…”

Section: Burial History Modelsmentioning

confidence: 90%

“…A regional disconformity, representing 26 Ma of missing section, separates the two units. The Palaeogene sequence, especially the Early and Middle Eocene interval in its upper part, contains good to very good quality source rocks (TOC mostly 1-5%; mixed oil and gas-prone kerogen ;Stein 2007;Mann et al 2009). The highest TOC values (up to 14%) were found, however, in a 2.5 m-thick, cross-banded dark and light banded clay at the base of the Late Early Miocene section that rests on the disconformity (Stein 2007;O'Regan et al 2008;Sangiorgi et al 2008).…”

Section: Paleocene and Eocene Stratamentioning

confidence: 99%

“…The Paleocene to Miocene source rocks identified by scientific drilling at the ACEX site were determined to be thermally immature because of insufficient burial (Stein 2007;Mann et al 2009). On the basis of his seismic data, Jokat (2005) pointed out that the Neogene sedimentary cover on the microcontinent increases in thickness to a maximum of about 1.6 km near the Siberian margin because of sediment shed from the Laptev Sea area.…”

Section: Burial History Modelsmentioning

confidence: 99%

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Chapter 49 A first look at the petroleum geology of the Lomonosov Ridge microcontinent, Arctic Ocean

Moore

Grantz²,

Pitman

et al. 2011

Memoirs

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The Lomonosov microcontinent is an elongated continental fragment that transects the Arctic Ocean between North America and Siberia via the North Pole. Although it lies beneath polar pack ice, the geological framework of the microcontinent is inferred from sparse seismic reflection data, a few cores, potential field data and the geology of its conjugate margin in the Barents–Kara Shelf. Petroleum systems inferred to be potentially active are comparable to those sourced by condensed Triassic and Jurassic marine shale of the Barents Platform and by condensed Jurassic and (or) Cretaceous shale probably present in the adjacent Amerasia Basin. Cenozoic deposits are known to contain rich petroleum source rocks but are too thermally immature to have generated petroleum. For the 2008 USGS Circum Arctic Resource Appraisal (CARA), the microcontinent was divided into shelf and slope assessment units (AUs) at the tectonic hinge line along the Amerasia Basin margin. A low to moderate probability of accumulation in the slope AU yielded fully risked mean estimates of 123 MMBO oil and 740 BCF gas. For the shelf AU, no quantitative assessment was made because the probability of petroleum accumulations of the 50 MMBOE minimum size was estimated to be less than 10% owing to rift-related uplift, erosion and faulting.

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“…Expedition 302 provides key data on the Palaeogene sediment composition and depositional environment which are of great interest in an exploration context. In particular, we note that the conditions for upper Paleocene/ lower Eocene black shale formation have been analysed by Boucsein &Mann et al (2009) consider the Eocene sediments on Lomonosov Ridge to have mainly good to very good source rock potential. On the other hand, an additional 1 þ km overburden is needed to generate petroleum.…”

Section: First Drilling In Central Arctic Ocean: Iodp Expedition 302mentioning

confidence: 99%

Chapter 46 Scientific deep-sea drilling in high northern latitudes

Thiede

Eldholm

Myhre

2011

Memoirs

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Some 30 years ago the regional aspects of the plate tectonic history of the Norwegian-Greenland Sea and the eastern Arctic Ocean were unravelled and showed that these ocean basins had opened in early Eocene, 55-56 Ma ago. Drilling by Glomar Challenger in the Norwegian -Greenland Sea during Leg 38 of the Deep Sea Drilling Project confirmed the plate tectonic model and established a marine biostratigraphy framework for the region. The leg set the stage for three subsequent Ocean Drilling Program legs of thematically oriented drilling by the Joides Resolution. Leg 104 drilled a deep acoustic basement hole on the Vøring Plateau, which has become a legacy hole for volcanic margin studies, and provided new key information on the Northern Hemisphere Glaciation and the history of the Norwegian Current. Legs 151 and 162 addressed North Atlantic-Arctic gateways problems. During Leg 151 the Joides Resolution succeeded, with icebreaker support, in reaching the ice-free waters north of Svalbard, thus for the first time bringing a scientific drill ship into the Arctic Ocean. In 2004, the Integrated Ocean Drilling Program organized the mission-specific Expedition 302 to the Lomonosov Ridge in the permanently ice-covered central Arctic Ocean. Comprising a flotilla of three icebreakers, it was a major logistical venture, and resulted in a huge scientific success. The same year the deep site on the Vøring Plateau was revisited and a thermal borehole observatory installed. During these legs a large quantity of core samples has allowed the scientific community to address fundamental questions in terms of continental margin development; plate tectonics; nature of basement; marine biostratigraphy; and the temporal and spatial evolution of the high-latitude northern climate and environments. However, major challenges remain, in particular related to the deep basins, ridges and margins of the Arctic Ocean proper. The next advance in knowledge is contingent on new technology and research infrastructure both for drilling and site surveying. Presently, plans for a new research icebreaker with drilling capability are being developed, the Aurora Borealis project. It will allow systematic drilling in most of the permanently ice-covered basins in the high north. The northern high latitudes have been predicted to contain vast hydrocarbon resources and cooperative ventures between industry and academia may be advantageous.

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Evaluation and modelling of Tertiary source rocks in the central Arctic Ocean

Cited by 29 publications

References 47 publications

Towards an improved organic carbon budget for the western Barents Sea shelf

Towards an improved organic carbon budget for the western Barents Sea shelf

Chapter 49 A first look at the petroleum geology of the Lomonosov Ridge microcontinent, Arctic Ocean

Chapter 46 Scientific deep-sea drilling in high northern latitudes

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