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Geological features for the formation of gas-geochemical fields, including helium and hydrogen, in the water and sediments at the Vietnamese part of the South-China Sea

N.S. Syrbu, D.H. Cuong, Т.S. Iakimov, A.О. Kholmogorov, Yu.А. Telegin, U. Tsunogai

Original article

DOI https://doi.org/10.18599/grs.2021.1.16

132-142
rus.

open access

Under a Creative Commons license
The paper presents the results of a complex joint Russian-Vietnamese geological, geophysical and oceanographic expedition in the South-China Sea (R/V “Akademik M.A. Lavrentyev”, cruise 88, 2019), as well as related joint Russian-Vietnamese marine and land researches in the area of north and south Vietnam under a series of local FEB RAS – VAST grants. The organizers of the marine expedition are the V. I. Ilyichev Pacific Oceanological Institute of the Far Eastern Branch of the Russian Academy of Sciences (POI FEB RAS) and the Institute of Marine Geology and Geophysics of the Vietnam Academy of Science and Technology (IMGG VAST). In comparison with the Sea of Japan and the Sea of Okhotsk, it can be noted that the active bottom degassing on the on the Vietnamese shelf and slope have is a local, although the intensity of gas-geochemical anomalies is comparable to similar zones in the Far Eastern Seas. For the first time, anomalous methane fields (up to 5000 nl/l) were found in the water column of the South-China Sea, which are comparable to anomalies on the oil and gas shelf and the gas-hydrate-bearing slope of Sakhalin Island.

Metamorphosed sedimentary and volcanic rocks were discovered for the first time in the southern part of Catba Island (Gulf of Tonkin), which indicates the introduction of an endogenous body into the sedimentary strata and its further transformation. In connection with the discovery in 2020 of the large Ken Bau gas field at the southern end of the sedimentary basin of the Red River, the forecast of POI scientists about the presence of significant hydrocarbon reserves in this area was confirmed.
The work was carried out within the framework of the joint Vietnam-Russia Laboratory for Marine Sciences and Technology (V. I. Ilyichev Pacific Oceanological Institute of the Far Eastern Branch of the Russian Academy of Sciences and the Institute of Marine Geology and Geophysics Vietnam Academy of Science and Technology).

The expedition of the R/V “Akademik M.A. Lavrentyev” (cruise 88) is part of a series of expeditions in accordance with the UN Decade dedicated to the Ocean Science for Sustainable Development.
 
helium, hydrogen, hydrocarbon potential, Nam Con Son basin, Phu Khan basin, Red River basin, South-China Sea
 
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Nadezhda S. Syrbu
Il’ichev Pacific Oceanological Institute, Far Eastern Branch of the Russian Academy of Sciences
43 Baltiyskaya St., Vladivostok, 690041, Russian Federation
e-mail: syrbu@poi.dvo.ru

Do Huy Kyong
Vietnam Academy of Sciences and Technology
18, Hoang Quoc Viet, Hanoi, Viet Nam

Timur S. Yakimov
Il’ichev Pacific Oceanological Institute, Far Eastern Branch of the Russian Academy of Sciences
43 Baltiyskaya St., Vladivostok, 690041, Russian Federation

Andrey O. Kholmogorov
Il’ichev Pacific Oceanological Institute, Far Eastern Branch of the Russian Academy of Sciences
43 Baltiyskaya St., Vladivostok, 690041, Russian Federation

Yury A. Telegin
Il’ichev Pacific Oceanological Institute, Far Eastern Branch of the Russian Academy of Sciences
43 Baltiyskaya St., Vladivostok, 690041, Russian Federation

Urumu Tsunogai
Nagoya University
Furo-cho, Chikusa-ku, Nagoya 464-8601, Japan

 

For citation:

Syrbu N.S., Cuong D.H., Iakimov Т.S., Kholmogorov A.О., Telegin Yu.А., Tsunogai U. (2021). Geological features for the formation of gas-geochemical fields, including helium and hydrogen, in the water and sediments at the Vietnamese part of the South-China Sea. Georesursy = Georesources, 23(1), pp. 132–142. DOI: https://doi.org/10.18599/grs.2021.1.16