首页|Sand-rich gas hydrate and shallow gas systems in the Qiongdongnan Basin, northern South China Sea
Sand-rich gas hydrate and shallow gas systems in the Qiongdongnan Basin, northern South China Sea
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NSTL
In 2019, the sand-rich gas hydrate and shallow gas (GHSG) reservoirs have been drilled in the Qiongdongnan Basin, northern South China Sea. As a conventional energy resource, shallow gas can provide a continuous source of gas for gas hydrate accumulation, which is also the focus of future research on gas hydrates. Using core-log-seismic data, the distributions and sedimentary environments of the sand-rich GHSG reservoirs were identified and characterized. Then, the sand-rich GHSG systems were illustrated, and the interactions of gas hydrate with shallow gas were analyzed in details in the Qiongdongnan Basin. At last, an accumulation model for the GHSG systems was proposed. This model shows that natural gas in the deep parts of the hydrocarbon-rich sag migrated laterally to the study area to form deep natural gas reservoirs, and then is transported vertically through gas chimneys to form GHSG system. The system mainly includes gas sources, gas migration pathways, reservoirs, and seals, of which gas migration pathways are key influencing factors. Moreover, the whole system is a dynamically balanced system in which shallow gas reservoirs can provide adequate gas for gas hydrate formation; meanwhile, gas hydrates can be seals to prevent the leakage of free gas and facilitate a larger-scale shallow gas reservoir formed, so these two items are complementary and indispensable in the system.
Gas hydrateShallow gasGas chimneySand-rich reservoirsCold seepAccumulation modelSouth China Sea
Jinfeng Ren、Cong Cheng、Pengfei Xiong
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National Engineering Research Center of Gas Hydrate Exploration and Development, Guangzhou Marine Geology Survey, China Geological Survey, Ministry of Natural Resources, Guangzhou, 510075, China
Hubei Key Laboratory of Marine Geological Resources, China University of Geosciences, Wuhan, 430074, China
NSTL
