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The lower pT limit of deep hydrocarbon synthesis by CaCO3 aqueous reduction
KTH.
KTH.
2017 (English)In: Scientific Reports, ISSN 2045-2322, E-ISSN 2045-2322, Vol. 7, article id 5749Article in journal (Refereed) Published
Abstract [en]

The deep abiogenic synthesis of hydrocarbons is possible under the conditions of the asthenosphere. We have found that this process can also occur under the mineral and thermobaric conditions of subducting slabs. We have investigated the abiogenic synthesis of hydrocarbon systems at pressures of 2.0-6.6 GPa and temperatures of 250-600 degrees C. The determined lower thermobaric limit of the reaction at 280-300 degrees C and 2-3 GPa corresponds to a depth of 70-80 km during cold subduction. The hydrocarbon fluid formed in the slab can migrate upwards through the network of faults and fractures to form petroleum deposits.

Place, publisher, year, edition, pages
NATURE PUBLISHING GROUP , 2017. Vol. 7, article id 5749
National Category
Geochemistry
Identifiers
URN: urn:nbn:se:kth:diva-212347DOI: 10.1038/s41598-017-06155-6ISI: 000405746500060OAI: oai:DiVA.org:kth-212347DiVA, id: diva2:1134823
Note

QC 20170821

Available from: 2017-08-21 Created: 2017-08-21 Last updated: 2018-02-26Bibliographically approved
In thesis
1. Deep generated methane in the global methane budget
Open this publication in new window or tab >>Deep generated methane in the global methane budget
2018 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Methane is a significant part of the global carbon cycle. The distribution of methane above and below the Earth’s surface suggests that atmospheric methane might be related to methane originating from the deep mantle.

The purpose of the present study is to identify this relationship between methane emissions to the atmosphere and methane, which can be abiogenically generated within the Earth’s interior. Methane hydrates within the Earth’s surface sediments might be among the possible hosts of migrated deep methane.

In this thesis, experimental work is presented, which aimed to reveal the depth at which methane and other hydrocarbons in the upper mantle are abiogenically generated, considering pT and redox conditions of the surrounding environment. High-pressure, high-temperature experiments were conducted using a large reactive volume device with a toroid-type chamber in specially prepared sample containers.

The present study evaluates the formation of methane and other hydrocarbons at temperatures higher than 300 °C at pressures of 2.5-6.5 GPa despite the redox conditions of the surroundings. These conditions correspond to a depth below 70 km on the surface of a cold subducting slab.

The proposed hypothesis claims that the deep-mantle-generated methane can contribute to the formation of methane hydrates and accumulation of free gas below hydrates. 

Place, publisher, year, edition, pages
Stockholm: KTH Royal Institute of Technology, 2018. p. 66
National Category
Geosciences, Multidisciplinary Energy Engineering Other Chemistry Topics
Research subject
Energy Technology
Identifiers
urn:nbn:se:kth:diva-223609 (URN)T RITA KRV Report 17/08 (Local ID)978-91-7729-656-0 (ISBN)T RITA KRV Report 17/08 (Archive number)T RITA KRV Report 17/08 (OAI)
Public defence
2018-03-14, Kollegiesalen, Stockholm, 13:00 (English)
Opponent
Supervisors
Note

QC 20180226

Available from: 2018-02-27 Created: 2018-02-25 Last updated: 2018-02-27Bibliographically approved

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