Influence of Gas Supply Changes on the Formation Process of Complex Mixed Gas Hydrates
Natural gas hydrate occurrences contain predominantly methane; however, there are increasing reports of complex mixed gas hydrates and coexisting hydrate phases. Changes in the feed gas composition due to the preferred incorporation of certain components into the hydrate phase and an inadequate gas...
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| Format: | Article |
| Language: | English |
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MDPI AG
2021-05-01
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| Series: | Molecules |
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| Online Access: | https://www.mdpi.com/1420-3049/26/10/3039 |
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| author | Mengdi Pan Judith M. Schicks |
| author_facet | Mengdi Pan Judith M. Schicks |
| author_sort | Mengdi Pan |
| collection | DOAJ |
| description | Natural gas hydrate occurrences contain predominantly methane; however, there are increasing reports of complex mixed gas hydrates and coexisting hydrate phases. Changes in the feed gas composition due to the preferred incorporation of certain components into the hydrate phase and an inadequate gas supply is often assumed to be the cause of coexisting hydrate phases. This could also be the case for the gas hydrate system in Qilian Mountain permafrost (QMP), which is mainly controlled by pores and fractures with complex gas compositions. This study is dedicated to the experimental investigations on the formation process of mixed gas hydrates based on the reservoir conditions in QMP. Hydrates were synthesized from water and a gas mixture under different gas supply conditions to study the effects on the hydrate formation process. In situ Raman spectroscopic measurements and microscopic observations were applied to record changes in both gas and hydrate phase over the whole formation process. The results demonstrated the effects of gas flow on the composition of the resulting hydrate phase, indicating a competitive enclathration of guest molecules into the hydrate lattice depending on their properties. Another observation was that despite significant changes in the gas composition, no coexisting hydrate phases were formed. |
| first_indexed | 2024-03-10T11:15:20Z |
| format | Article |
| id | doaj.art-96bbdbaf668a470987847a2c89a3a8c4 |
| institution | Directory Open Access Journal |
| issn | 1420-3049 |
| language | English |
| last_indexed | 2024-03-10T11:15:20Z |
| publishDate | 2021-05-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Molecules |
| spelling | doaj.art-96bbdbaf668a470987847a2c89a3a8c42023-11-21T20:29:26ZengMDPI AGMolecules1420-30492021-05-012610303910.3390/molecules26103039Influence of Gas Supply Changes on the Formation Process of Complex Mixed Gas HydratesMengdi Pan0Judith M. Schicks1GFZ German Research Centre for Geosciences, Telegrafenberg, 14473 Potsdam, GermanyGFZ German Research Centre for Geosciences, Telegrafenberg, 14473 Potsdam, GermanyNatural gas hydrate occurrences contain predominantly methane; however, there are increasing reports of complex mixed gas hydrates and coexisting hydrate phases. Changes in the feed gas composition due to the preferred incorporation of certain components into the hydrate phase and an inadequate gas supply is often assumed to be the cause of coexisting hydrate phases. This could also be the case for the gas hydrate system in Qilian Mountain permafrost (QMP), which is mainly controlled by pores and fractures with complex gas compositions. This study is dedicated to the experimental investigations on the formation process of mixed gas hydrates based on the reservoir conditions in QMP. Hydrates were synthesized from water and a gas mixture under different gas supply conditions to study the effects on the hydrate formation process. In situ Raman spectroscopic measurements and microscopic observations were applied to record changes in both gas and hydrate phase over the whole formation process. The results demonstrated the effects of gas flow on the composition of the resulting hydrate phase, indicating a competitive enclathration of guest molecules into the hydrate lattice depending on their properties. Another observation was that despite significant changes in the gas composition, no coexisting hydrate phases were formed.https://www.mdpi.com/1420-3049/26/10/3039mixed gas hydrateshydrate formation processcoexisting phasesin situ Raman spectroscopygas supply conditions |
| spellingShingle | Mengdi Pan Judith M. Schicks Influence of Gas Supply Changes on the Formation Process of Complex Mixed Gas Hydrates Molecules mixed gas hydrates hydrate formation process coexisting phases in situ Raman spectroscopy gas supply conditions |
| title | Influence of Gas Supply Changes on the Formation Process of Complex Mixed Gas Hydrates |
| title_full | Influence of Gas Supply Changes on the Formation Process of Complex Mixed Gas Hydrates |
| title_fullStr | Influence of Gas Supply Changes on the Formation Process of Complex Mixed Gas Hydrates |
| title_full_unstemmed | Influence of Gas Supply Changes on the Formation Process of Complex Mixed Gas Hydrates |
| title_short | Influence of Gas Supply Changes on the Formation Process of Complex Mixed Gas Hydrates |
| title_sort | influence of gas supply changes on the formation process of complex mixed gas hydrates |
| topic | mixed gas hydrates hydrate formation process coexisting phases in situ Raman spectroscopy gas supply conditions |
| url | https://www.mdpi.com/1420-3049/26/10/3039 |
| work_keys_str_mv | AT mengdipan influenceofgassupplychangesontheformationprocessofcomplexmixedgashydrates AT judithmschicks influenceofgassupplychangesontheformationprocessofcomplexmixedgashydrates |