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Deep genesis of hydrocarbons under oxidized conditions
KTH.
KTH.
KTH.
KTH, School of Industrial Engineering and Management (ITM), Energy Technology, Heat and Power Technology.
(English)In: Article in journal (Refereed) Submitted
National Category
Chemical Sciences
Identifiers
URN: urn:nbn:se:kth:diva-223647OAI: oai:DiVA.org:kth-223647DiVA, id: diva2:1185961
Note

QC 20180314

Available from: 2018-02-27 Created: 2018-02-27 Last updated: 2018-03-14Bibliographically 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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