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Deep generated methane in the global methane budget
KTH, School of Industrial Engineering and Management (ITM), Energy Technology. Gubkin Russian State University.
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: urn:nbn:se:kth:diva-223609Local ID: T RITA KRV Report 17/08ISBN: 978-91-7729-656-0 (print)OAI: oai:DiVA.org:kth-223609DiVA, id: diva2:1185460
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
List of papers
1. The lower pT limit of deep hydrocarbon synthesis by CaCO3 aqueous reduction
Open this publication in new window or tab >>The lower pT limit of deep hydrocarbon synthesis by CaCO3 aqueous reduction
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
National Category
Geochemistry
Identifiers
urn:nbn:se:kth:diva-212347 (URN)10.1038/s41598-017-06155-6 (DOI)000405746500060 ()2-s2.0-85024853337 (Scopus ID)
Note

QC 20170821

Available from: 2017-08-21 Created: 2017-08-21 Last updated: 2018-09-19Bibliographically approved
2. The influence of a sample container material on high pressure formation of hydrocarbons
Open this publication in new window or tab >>The influence of a sample container material on high pressure formation of hydrocarbons
Show others...
(English)In: Article in journal (Refereed) Submitted
National Category
Natural Sciences
Identifiers
urn:nbn:se:kth:diva-223646 (URN)
Note

QC 20180314

Available from: 2018-02-27 Created: 2018-02-27 Last updated: 2018-03-14Bibliographically approved
3. Deep genesis of hydrocarbons under oxidized conditions
Open this publication in new window or tab >>Deep genesis of hydrocarbons under oxidized conditions
(English)In: Article in journal (Refereed) Submitted
National Category
Chemical Sciences
Identifiers
urn:nbn:se:kth:diva-223647 (URN)
Note

QC 20180314

Available from: 2018-02-27 Created: 2018-02-27 Last updated: 2018-03-14Bibliographically approved
4. Experimental Modelling of Hydrocarbon Migration Processes
Open this publication in new window or tab >>Experimental Modelling of Hydrocarbon Migration Processes
2017 (English)In: Joint AIRAPT-25th and EHPRG-53rd International Conference on High Pressure Science and Technology, 2015, Institute of Physics (IOP), 2017, article id 042040Conference paper (Refereed)
Abstract [en]

One of the most important questions in the frame of the concept of deep abiogenic origin of hydrocarbons is how hydrocarbons generated under the upper mantle conditions could migrate upward to the Earth's crust to form hydrocarbon deposits. Two different ways of fluid migration were proposed and simulated - slow migration during hundreds of years and fast migration-eruption. Influence of the fluid's migration speed on the final hydrocarbon mixture composition was studied. The received results show that the relative chemical composition of the hydrocarbon mixtures probably does not depend on the cooling conditions (the speed of the fluid migration).

Place, publisher, year, edition, pages
Institute of Physics (IOP), 2017
Series
Journal of Physics Conference Series, ISSN 1742-6588 ; 950
Keywords
High-Pressure, Methane, Reduction, Mantle
National Category
Physical Sciences
Identifiers
urn:nbn:se:kth:diva-221053 (URN)10.1088/1742-6596/950/4/042040 (DOI)000418562300067 ()2-s2.0-85038588656 (Scopus ID)
Conference
Joint 25th AIRAPT / 53rd EHPRG International Conference on High Pressure Science and Technology, AUG 30-SEP 04, 2015, Madrid, Spain
Note

QC 20180111

Available from: 2018-01-11 Created: 2018-01-11 Last updated: 2018-02-27Bibliographically approved

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