Organic matter characterization of the Lower Cretaceous tight reservoirs in the Danish North Sea

Rudra, Arka; Sanei, Hamed; Nytoft, Hans Peter; Petersen, Henrik I.; Blok, Carlette; Bodin, Stéphane; Bojesen‐Koefoed, Jørgen A.

doi:10.1016/j.coal.2021.103714

Cited by 12 publications

(5 citation statements)

References 25 publications

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“…2012; Rudra et al . 2021). The heating during the pyrolysis stage causes the organic bonds to break, which results in peaks of S0, S1, S2 and S3, corresponding to the labile organic matter (Fig.…”

Section: Methodsmentioning

confidence: 99%

“…The temperature is then ramped at 25 °C min −1 until 650 °C (creating the S2 peak), measured with a flame ionization detector (Rudra et al . 2021). S3 is measured continuously by online infrared detectors during the pyrolysis.…”

Section: Methodsmentioning

confidence: 99%

“…Fluorescence microscopy was conducted under an excitation bandpass of 365/12 nm and an emission long pass of 397 nm (Rudra et al . 2021).…”

Section: Methodsmentioning

confidence: 99%

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From land to sea: provenance, composition, and preservation of organic matter in a marine sediment record from the North‐East Greenland shelf spanning the Younger Dryas–Holocene

Andreasen,

Jackson,

Rudra

et al. 2023

Boreas

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The organic matter content of marine sediments is often used to infer past changes in ocean conditions. However, the organic carbon pool preserved in coastal sediments is a complex mixture derived from different sources and may not reflect in situ processes. In this study, we combine taxonomic identification of reworked palynomorphs with pyrolysis organic geochemistry and reflected‐light organic petrographic microscopy to investigate the provenance, composition and preservation of organic matter in a marine sediment core retrieved from the NE Greenland shelf. Our study reveals continuous yet variable input of land‐derived organic carbon to the marine environment throughout the late Younger Dryas–Holocene, with the highest input of inert carbon in the late Younger Dryas. Although the sediments contain some recent marine palynomorphs, there is no other evidence of fresh marine organic carbon. In contrast, our results indicate that these shelf sediments represent a significant sink of recycled organic carbon. The results of pyrolysis geochemistry revealed that ~90% of the total organic carbon in the sediments is inert. The organic petrography analyses revealed that >70–84% of the organic carbon in the sediment core is terrigenous. Reworked dinoflagellate cysts showed a continuous provenance of Cretaceous land‐derived material, most likely from the nearby Clavering Island. Our study points to the importance of constraining the organic matter origin, composition and preservation in marine sediments to achieve more accurate palaeoenvironmental reconstructions based on organic proxies.

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

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From land to sea: provenance, composition, and preservation of organic matter in a marine sediment record from the North‐East Greenland shelf spanning the Younger Dryas–Holocene

Andreasen,

Jackson,

Rudra

et al. 2023

Boreas

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“…In order to characterize organic matter, 53 powdered bulk samples (approximately 50 mg) covering the late Rhaetian and Hettangian were subjected to bulk pyrolysis geochemistry using a HAWK Pyrolysis and TOC instrument (Wildcat Technologies, USA) at Aarhus University based on the methods described in Rudra et al (2021). This method follows the conventional Rock-Eval 6® method (Lafargue et al, 1998) during which the samples were subjected to the standard pyrolysisoxidation cycle to produce the S 1 and S 2 peaks in a stepwise increase in temperature.…”

Section: Organic Carbon Isotope Record and Organic Matter Characteris...mentioning

confidence: 99%

Triassic-Jurassic Vegetation Response to Carbon Cycle Perturbations and Climate Change

Bos

Lindström

Cittert

et al. 2023

Preprint

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“…For the analysis, the samples were freeze-dried and finely ground. Approximately 2 mg of carcass sample mixed with 50 mg of sand were analyzed by the programmed-temperature method HAWK ® anhydrous pyrolysis (Wildcat Technologies, USA) and Total Organic Carbon (TOC) Instrument (Rudra et al, 2021). To accurately quantify the pyrolysable organic carbon fractions, the pyrolysis-TOC analysis was coupled with continuous extended slow heating (ESH ® ; PetroEval ApS, Denmark) pyrolysis analysis (Sanei et al, 2015).…”

Section: Particulate Organic Carbon Fractionsmentioning

confidence: 99%

Sinking krill carcasses as hotspots of microbial carbon and nitrogen cycling in the Arctic

Franco-Cisterna

Glud²,

Bristow³

et al. 2022

Front. Mar. Sci.

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Krill represent a major link between primary producers and higher trophic levels in polar marine food webs. Potential links to lower trophic levels, such as heterotrophic microorganisms, are less well documented. Here, we studied the kinetics of microbial degradation of sinking carcasses of two dominant krill species Thysanoessa raschii and Meganyctiphanes norvegica from Southwest Greenland. Degradation experiments under oxic conditions showed that 6.0-9.1% of carbon and 6.4-7.1% of nitrogen were lost from the carcasses after one week. Aerobic microbial respiration and the release of dissolved organic carbon were the main pathways of carbon loss from the carcasses. Ammonium release generally contributed the most to carcass nitrogen loss. Oxygen micro profiling revealed anoxic conditions inside krill carcasses/specimens, allowing anaerobic nitrogen cycling through denitrification and dissimilatory nitrate reduction to ammonium (DNRA). Denitrification rates were up to 5.3 and 127.7 nmol N carcass-1 d-1 for T. raschii and M. norvegica, respectively, making krill carcasses hotspots of nitrogen loss in the oxygenated water column of the fjord. Carcass-associated DNRA rates were up to 4-fold higher than denitrification rates, but the combined activity of these two anaerobic respiration processes did not contribute significantly to carbon loss from the carcasses. Living krill specimens did not harbor any significant denitrification and DNRA activity despite having an anoxic gut as revealed by micro profiling. The investigated krill carcasses sink fast (1500-3000 m d-1) and our data show that only a small fraction of the associated carbon is lost during descent. Based on data on krill distribution, our findings are used to discuss the potential importance of sinking krill carcasses for sustaining benthic food webs in the Arctic.

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Organic matter characterization of the Lower Cretaceous tight reservoirs in the Danish North Sea

Cited by 12 publications

References 25 publications

From land to sea: provenance, composition, and preservation of organic matter in a marine sediment record from the North‐East Greenland shelf spanning the Younger Dryas–Holocene

From land to sea: provenance, composition, and preservation of organic matter in a marine sediment record from the North‐East Greenland shelf spanning the Younger Dryas–Holocene

Triassic-Jurassic Vegetation Response to Carbon Cycle Perturbations and Climate Change

Sinking krill carcasses as hotspots of microbial carbon and nitrogen cycling in the Arctic

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