Structure II gas hydrates found below the bottom‐simulating reflector
Abstract Gas hydrates are a major component in the organic carbon cycle. Their stability is controlled by temperature, pressure, water chemistry, and gas composition. The bottom‐simulating reflector (BSR) is the primary seismic indicator of the base of hydrate stability in continental margins. Here...
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| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
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Wiley
2016-06-01
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| Series: | Geophysical Research Letters |
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| Online Access: | https://doi.org/10.1002/2016GL069452 |
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| author | M. Paganoni J. A. Cartwright M. Foschi R. C. Shipp P. Van Rensbergen |
| author_facet | M. Paganoni J. A. Cartwright M. Foschi R. C. Shipp P. Van Rensbergen |
| author_sort | M. Paganoni |
| collection | DOAJ |
| description | Abstract Gas hydrates are a major component in the organic carbon cycle. Their stability is controlled by temperature, pressure, water chemistry, and gas composition. The bottom‐simulating reflector (BSR) is the primary seismic indicator of the base of hydrate stability in continental margins. Here we use seismic, well log, and core data from the convergent margin offshore NW Borneo to demonstrate that the BSR does not always represent the base of hydrate stability and can instead approximate the boundary between structure I hydrates above and structure II hydrates below. At this location, gas hydrate saturation below the BSR is higher than above and a process of chemical fractionation of the migrating free gas is responsible for the structure I‐II transition. This research shows that in geological settings dominated by thermogenic gas migration, the hydrate stability zone may extend much deeper than suggested by the BSR. |
| format | Article |
| id | doaj-art-4c0f3663cd5f45cabbdac91ac4d12a79 |
| institution | OA Journals |
| issn | 0094-8276 1944-8007 |
| language | English |
| publishDate | 2016-06-01 |
| publisher | Wiley |
| record_format | Article |
| series | Geophysical Research Letters |
| spelling | doaj-art-4c0f3663cd5f45cabbdac91ac4d12a792025-08-20T02:31:41ZengWileyGeophysical Research Letters0094-82761944-80072016-06-0143115696570610.1002/2016GL069452Structure II gas hydrates found below the bottom‐simulating reflectorM. Paganoni0J. A. Cartwright1M. Foschi2R. C. Shipp3P. Van Rensbergen4Department of Earth Sciences University of Oxford Oxford UKDepartment of Earth Sciences University of Oxford Oxford UKDepartment of Earth Sciences University of Oxford Oxford UKShell Exploration and Production Inc. Houston Texas USAShell International Global Solutions B.V. Rijswijk NetherlandsAbstract Gas hydrates are a major component in the organic carbon cycle. Their stability is controlled by temperature, pressure, water chemistry, and gas composition. The bottom‐simulating reflector (BSR) is the primary seismic indicator of the base of hydrate stability in continental margins. Here we use seismic, well log, and core data from the convergent margin offshore NW Borneo to demonstrate that the BSR does not always represent the base of hydrate stability and can instead approximate the boundary between structure I hydrates above and structure II hydrates below. At this location, gas hydrate saturation below the BSR is higher than above and a process of chemical fractionation of the migrating free gas is responsible for the structure I‐II transition. This research shows that in geological settings dominated by thermogenic gas migration, the hydrate stability zone may extend much deeper than suggested by the BSR.https://doi.org/10.1002/2016GL069452gas hydratesBSRhydrocarbon migrationthermogenic gashydrate stabilitychemical fractionation |
| spellingShingle | M. Paganoni J. A. Cartwright M. Foschi R. C. Shipp P. Van Rensbergen Structure II gas hydrates found below the bottom‐simulating reflector Geophysical Research Letters gas hydrates BSR hydrocarbon migration thermogenic gas hydrate stability chemical fractionation |
| title | Structure II gas hydrates found below the bottom‐simulating reflector |
| title_full | Structure II gas hydrates found below the bottom‐simulating reflector |
| title_fullStr | Structure II gas hydrates found below the bottom‐simulating reflector |
| title_full_unstemmed | Structure II gas hydrates found below the bottom‐simulating reflector |
| title_short | Structure II gas hydrates found below the bottom‐simulating reflector |
| title_sort | structure ii gas hydrates found below the bottom simulating reflector |
| topic | gas hydrates BSR hydrocarbon migration thermogenic gas hydrate stability chemical fractionation |
| url | https://doi.org/10.1002/2016GL069452 |
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