2:25 PM - 2:45 PM
[MIS26-03] Gashydrate accumulations in the Asian Seas and perspective on comparable research in the Indo-Pacific Region
★Invited Papers
Keywords:gashydrates, Western Pacific, Indian Ocean, marginal seas
Gas hydrates - green energy resource of the future and modern marine phenomena, which significance growing up from year to year but still studied poorly in marine expeditions due to the lack of international cooperative study. Gas hydrates were found in many areas of the marginal Asian seas and evidently closely interrelated to the gas geochemistry, geology, geophysics, paleo- and oceanography, micro- and macrobiology, various environment aspects of the Asian Seas (AS) both seafloor and water column. Social effect of gashydrates research field is growing nowadays. Marginal seas of the Eastern Asia is a specific region manifested by insufficient studied gas hydrates (mainly, methane hydrates of different structures, but also carbon dioxide hydrates) phenomena as a resource, climate link and geochemical drive force, methane and accompanying gases fluxes in the "seafloor-water column-atmosphere" system. Numerous unique gas hydrate accumulations nowadays are object of few focused projects studies in Bering Sea, Japan Sea, Sea of Okhotsk, East-China Sea, South-China Sea and Philippine Sea separately by the Asian countries. There for, nature and evolution of the gas hydrate system in the lithosphere and hydrosphere of the AS, which in respect to energy resources and environmental agent is one of the most uncertain and debatable problem of World Ocean. We are also represents latest results of the bilateral Russia-Japan cooperation on gashydrates study in the Japan Sea.
Authors propose to conduct gashydrate comparable research in the promising basins of Indian Ocean and Western Pacific.
The key notice of our proposing joint research is based on the next key aspects.
Exploration of gas hydrates . Ground-truthing of gas hydrate deposits. Exploitation of gas hydrate deposits. Understanding the gas hydrate system in the active and passive continental margins; Migration of methane gas; Morphology of gas hydrates. Geo-hazards associated with gas hydrates. Cold seep and climate change.
The following scientific problems we are selected based on intense discussion:
Tectonics processes governing spatial distribution of gas hydrates: The scientists agree that most of the methane hydrate form due to gas migration from deep-seated gas reservoirs through active fault/fracture system. Several examples of methane migration through active faults are reported from both active continental margin (the Pacific Gas hydrate Rim) as well as from passive continental margin (Krishna-Godavari basin). Mapping areas of neo-tectonism based on seismological/GPS study can help in locating gas hydrate deposits. Role of Geo-fluids in hydrate formations: It is agreed that deep-seated fluids play a major role in the formation of shallow gas hydrate deposits. New techniques for mapping of gas hydrate deposits: The conventional seismic used in gas hydrate exploration is not effective and the study of BSR may not be sufficient for mapping hydrate deposits. Most The geophysical technique should be followed by drilling/coring to validate the findings. In shallow waters, vibro-coring and drilling-rig provide long cores (up to 60 m) for validation. Exploitation of gas hydrate deposits: Indian scientists showed a keen interest in exploitation of gas hydrate deposits and highlighted some of the problems they anticipate like Sand ingress in borehole, low Gas-to-Water ratio, huge water production due to shallow acquifers, seafloor subsidence and stability and Geo-hazards triggered due to uncontrolled gas migration. There are several locations in the Arctic Seas, Sea of Okhotsk (more than 1000 methane flares offshore Sakhalin Island or single gas flares up to 2200 m height in Kurile Basin), and Japan Sea (Tatar strait) where significant methane flux is observed. The methane fluxes from the seep sites in Indian margin are not known and hydro-acoustic techniques can be developed for estimating methane fluxes. Cold seep and climate change: It is important to understand how methane migrates upon dissociation and what the sinks of methane in seawater are. The understanding of processes will help in better designing the production technology for exploitation of gas hydrate deposits in Indian margin.
Taking into account the Second International Indian Ocean Expedition (IIOE-2) and United Nations Decade of Ocean Science for Sustainable development (2021-2030) we are discussing the opportunity Joint long term cooperation on gas hydrates.
Authors propose to conduct gashydrate comparable research in the promising basins of Indian Ocean and Western Pacific.
The key notice of our proposing joint research is based on the next key aspects.
Exploration of gas hydrates . Ground-truthing of gas hydrate deposits. Exploitation of gas hydrate deposits. Understanding the gas hydrate system in the active and passive continental margins; Migration of methane gas; Morphology of gas hydrates. Geo-hazards associated with gas hydrates. Cold seep and climate change.
The following scientific problems we are selected based on intense discussion:
Tectonics processes governing spatial distribution of gas hydrates: The scientists agree that most of the methane hydrate form due to gas migration from deep-seated gas reservoirs through active fault/fracture system. Several examples of methane migration through active faults are reported from both active continental margin (the Pacific Gas hydrate Rim) as well as from passive continental margin (Krishna-Godavari basin). Mapping areas of neo-tectonism based on seismological/GPS study can help in locating gas hydrate deposits. Role of Geo-fluids in hydrate formations: It is agreed that deep-seated fluids play a major role in the formation of shallow gas hydrate deposits. New techniques for mapping of gas hydrate deposits: The conventional seismic used in gas hydrate exploration is not effective and the study of BSR may not be sufficient for mapping hydrate deposits. Most The geophysical technique should be followed by drilling/coring to validate the findings. In shallow waters, vibro-coring and drilling-rig provide long cores (up to 60 m) for validation. Exploitation of gas hydrate deposits: Indian scientists showed a keen interest in exploitation of gas hydrate deposits and highlighted some of the problems they anticipate like Sand ingress in borehole, low Gas-to-Water ratio, huge water production due to shallow acquifers, seafloor subsidence and stability and Geo-hazards triggered due to uncontrolled gas migration. There are several locations in the Arctic Seas, Sea of Okhotsk (more than 1000 methane flares offshore Sakhalin Island or single gas flares up to 2200 m height in Kurile Basin), and Japan Sea (Tatar strait) where significant methane flux is observed. The methane fluxes from the seep sites in Indian margin are not known and hydro-acoustic techniques can be developed for estimating methane fluxes. Cold seep and climate change: It is important to understand how methane migrates upon dissociation and what the sinks of methane in seawater are. The understanding of processes will help in better designing the production technology for exploitation of gas hydrate deposits in Indian margin.
Taking into account the Second International Indian Ocean Expedition (IIOE-2) and United Nations Decade of Ocean Science for Sustainable development (2021-2030) we are discussing the opportunity Joint long term cooperation on gas hydrates.