Sources of biogenic methane to form marine gas hydrates: In situ production or upward migration?
Potential sources of biogenic methane in the Carolina Continental Rise -- Blake Ridge sediments have been examined. Two models were used to estimate the potential for biogenic methane production: (1) construction of sedimentary organic carbon budgets, and (2) depth extrapolation of modern microbial...
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ftosti:oai:osti.gov:10185837 2023-07-30T04:04:55+02:00 Sources of biogenic methane to form marine gas hydrates: In situ production or upward migration? Paull, C.K. Ussler, W. III Borowski, W.S. 2008-02-12 application/pdf http://www.osti.gov/servlets/purl/10185837 https://www.osti.gov/biblio/10185837 https://doi.org/10.2172/10185837 unknown http://www.osti.gov/servlets/purl/10185837 https://www.osti.gov/biblio/10185837 https://doi.org/10.2172/10185837 doi:10.2172/10185837 03 NATURAL GAS CONTINENTAL SHELF NATURAL GAS HYDRATE DEPOSITS RESOURCE ASSESSMENT METHANE BIOSYNTHESIS NORTH CAROLINA SOUTH CAROLINA RESOURCE POTENTIAL GAS HYDRATES STABILITY MIGRATION METHANOGENIC BACTERIA SEDIMENTS 2008 ftosti https://doi.org/10.2172/10185837 2023-07-11T11:01:51Z Potential sources of biogenic methane in the Carolina Continental Rise -- Blake Ridge sediments have been examined. Two models were used to estimate the potential for biogenic methane production: (1) construction of sedimentary organic carbon budgets, and (2) depth extrapolation of modern microbial production rates. While closed-system estimates predict some gas hydrate formation, it is unlikely that >3% of the sediment volume could be filled by hydrate from methane produced in situ. Formation of greater amounts requires migration of methane from the underlying continental rise sediment prism. Methane may be recycled from below the base of the gas hydrate stability zone by gas hydrate decomposition, upward migration of the methane gas, and recrystallization of gas hydrate within the overlying stability zone. Methane bubbles may also form in the sediment column below the depth of gas hydrate stability because the methane saturation concentration of the pore fluids decreases with increasing depth. Upward migration of methane bubbles from these deeper sediments can add methane to the hydrate stability zone. From these models it appears that recycling and upward migration of methane is essential in forming significant gas hydrate concentrations. In addition, the depth distribution profiles of methane hydrate will differ if the majority of the methane has migrated upward rather than having been produced in situ. Other/Unknown Material Methane hydrate SciTec Connect (Office of Scientific and Technical Information - OSTI, U.S. Department of Energy) |
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SciTec Connect (Office of Scientific and Technical Information - OSTI, U.S. Department of Energy) |
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03 NATURAL GAS CONTINENTAL SHELF NATURAL GAS HYDRATE DEPOSITS RESOURCE ASSESSMENT METHANE BIOSYNTHESIS NORTH CAROLINA SOUTH CAROLINA RESOURCE POTENTIAL GAS HYDRATES STABILITY MIGRATION METHANOGENIC BACTERIA SEDIMENTS |
spellingShingle |
03 NATURAL GAS CONTINENTAL SHELF NATURAL GAS HYDRATE DEPOSITS RESOURCE ASSESSMENT METHANE BIOSYNTHESIS NORTH CAROLINA SOUTH CAROLINA RESOURCE POTENTIAL GAS HYDRATES STABILITY MIGRATION METHANOGENIC BACTERIA SEDIMENTS Paull, C.K. Ussler, W. III Borowski, W.S. Sources of biogenic methane to form marine gas hydrates: In situ production or upward migration? |
topic_facet |
03 NATURAL GAS CONTINENTAL SHELF NATURAL GAS HYDRATE DEPOSITS RESOURCE ASSESSMENT METHANE BIOSYNTHESIS NORTH CAROLINA SOUTH CAROLINA RESOURCE POTENTIAL GAS HYDRATES STABILITY MIGRATION METHANOGENIC BACTERIA SEDIMENTS |
description |
Potential sources of biogenic methane in the Carolina Continental Rise -- Blake Ridge sediments have been examined. Two models were used to estimate the potential for biogenic methane production: (1) construction of sedimentary organic carbon budgets, and (2) depth extrapolation of modern microbial production rates. While closed-system estimates predict some gas hydrate formation, it is unlikely that >3% of the sediment volume could be filled by hydrate from methane produced in situ. Formation of greater amounts requires migration of methane from the underlying continental rise sediment prism. Methane may be recycled from below the base of the gas hydrate stability zone by gas hydrate decomposition, upward migration of the methane gas, and recrystallization of gas hydrate within the overlying stability zone. Methane bubbles may also form in the sediment column below the depth of gas hydrate stability because the methane saturation concentration of the pore fluids decreases with increasing depth. Upward migration of methane bubbles from these deeper sediments can add methane to the hydrate stability zone. From these models it appears that recycling and upward migration of methane is essential in forming significant gas hydrate concentrations. In addition, the depth distribution profiles of methane hydrate will differ if the majority of the methane has migrated upward rather than having been produced in situ. |
author |
Paull, C.K. Ussler, W. III Borowski, W.S. |
author_facet |
Paull, C.K. Ussler, W. III Borowski, W.S. |
author_sort |
Paull, C.K. |
title |
Sources of biogenic methane to form marine gas hydrates: In situ production or upward migration? |
title_short |
Sources of biogenic methane to form marine gas hydrates: In situ production or upward migration? |
title_full |
Sources of biogenic methane to form marine gas hydrates: In situ production or upward migration? |
title_fullStr |
Sources of biogenic methane to form marine gas hydrates: In situ production or upward migration? |
title_full_unstemmed |
Sources of biogenic methane to form marine gas hydrates: In situ production or upward migration? |
title_sort |
sources of biogenic methane to form marine gas hydrates: in situ production or upward migration? |
publishDate |
2008 |
url |
http://www.osti.gov/servlets/purl/10185837 https://www.osti.gov/biblio/10185837 https://doi.org/10.2172/10185837 |
genre |
Methane hydrate |
genre_facet |
Methane hydrate |
op_relation |
http://www.osti.gov/servlets/purl/10185837 https://www.osti.gov/biblio/10185837 https://doi.org/10.2172/10185837 doi:10.2172/10185837 |
op_doi |
https://doi.org/10.2172/10185837 |
_version_ |
1772816563982827520 |