MARINE GAS HYDRATE RESEARCH: CHANGING VIEWS OVER THE PAST 25 YEARS
During the past quarter century views have changed in marine gas-hydrate research and in its perception by the society at large: (1) Deep-sea drilling has gone from a policy of avoiding gas hydrate to emphasizing deliberate drilling for it. (2) International programs have evolved from exploiting gas...
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| Format: | Text |
| Language: | English |
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| Online Access: | http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.460.4122 http://www.pet.hw.ac.uk/icgh7/papers/icgh2011Final00786.pdf |
| Summary: | During the past quarter century views have changed in marine gas-hydrate research and in its perception by the society at large: (1) Deep-sea drilling has gone from a policy of avoiding gas hydrate to emphasizing deliberate drilling for it. (2) International programs have evolved from exploiting gas hydrates as energy to considering exchange of CO2 for CH4 hydrates as a means of carbon dioxide storage. (3) Lately, due to global change, research has changed from pursuing methane-hydrate reserves to documenting release of methane from destabilization in marginal seas. The first stage generated a wealth of knowledge and laid the foundation for marine gas hydrate research upon which we build today. The second stage is traced to more accurately estimating exploitable hydrate-bound gas and finding recovery technologies, that has lead to the discovery of an innovative option coupling production of methane from CH4-hydrate to storage of CO2 via in the sub-seafloor. Governments worldwide have recognized the potential for carbon dioxide storage and have begun to implement regulations for such environmentally safe carbon capture and storage (CCS). During the third stage, in further exploring global methane hydrate reserves, it has become evident that environmental changes over the past decades may have triggered release of methane from destabilizing hydrate at the seabed as well as diminished oxygen content in the near-bottom of marginal seas. Such scenarios had been proposed for past global warming and now appear to become active again. Exemplary highlights and selected cases studies are documented for each of the evolving stages. |
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