琼东南盆地天然气水合物与浅层气共生体系成藏特征

陈子归; 姜涛; 匡增桂; 程聪; 熊鹏飞; 陈岳

doi:10.3799/dqkx.2022.094

Volume 47 Issue 5

May 2022

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Chen Zigui, Jiang Tao, Kuang Zenggui, Cheng Cong, Xiong Pengfei, Chen Yue, 2022. Accumulation Characteristics of Gas Hydrate-Shallow Gas Symbiotic System in Qiongdongnan Basin. Earth Science, 47(5): 1619-1634. doi: 10.3799/dqkx.2022.094

Citation:

Chen Zigui, Jiang Tao, Kuang Zenggui, Cheng Cong, Xiong Pengfei, Chen Yue, 2022. Accumulation Characteristics of Gas Hydrate-Shallow Gas Symbiotic System in Qiongdongnan Basin. Earth Science, 47(5): 1619-1634. doi: 10.3799/dqkx.2022.094

Citation:

Chen Zigui, Jiang Tao, Kuang Zenggui, Cheng Cong, Xiong Pengfei, Chen Yue, 2022. Accumulation Characteristics of Gas Hydrate-Shallow Gas Symbiotic System in Qiongdongnan Basin. Earth Science, 47(5): 1619-1634. doi: 10.3799/dqkx.2022.094

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Accumulation Characteristics of Gas Hydrate-Shallow Gas Symbiotic System in Qiongdongnan Basin

doi: 10.3799/dqkx.2022.094

Chen Zigui^{1, 2
,
,},
Jiang Tao^{1, 2
,
,
,},
Kuang Zenggui^{2, 3},
Cheng Cong^{1, 2},
Xiong Pengfei^{1, 2},
Chen Yue^{1, 2}

1.
Hubei Key Laboratory of Marine Geological Resources, China University of Geosciences, Wuhan 430074, China
2.
Southern Marine Science and Engineering Guangdong Laboratory (Guangzhou), Guangzhou 511458, China
3.
Guangzhou Marine Geological Survey, Ministry of Natural Resources, Guangzhou 510075, China

Received Date: 2021-12-01
Publish Date: 2022-05-25

Abstract

Abstract

Following the successful production test of natural gas hydrate in the Shenhu area in China, the exploration in the Qiongdongnan basin in recent years has confirmed the existence of natural gas hydrate, which shows a complex symbiotic relationship with shallow gas by the drilling. In order to reveal the accumulation characteristics of gas hydrate-shallow gas symbiotic system in the deep water area of the Qiongdongnan basin, combining core photos, logging data, and three-dimensional seismic data, the spatial distribution characteristics of gas hydrate and shallow gas is expounded in the study area.The research results show that gas hydrate mainly exists in sandy sediments above -200 m below the seafloor, and its formation process is related to the vertical migration of shallow gas. The deep analysis of the accumulation characteristics of gas hydrate and shallow gas symbiotic system shows that deep thermogenic gas and shallow biogenic gas are the vital gas source. The unconsolidated sand layer in the Quaternary strata is a high-quality reservoir. The distribution of gas hydrate and shallow gas symbiotic system is mainly affected by deep gas chimneys and faults. Shallow gas has been providing stable gas source for gas hydrate. The mass transport deposits and gas hydrate-bearing sediments developed in the Quaternary strata can effectively block the vertical migration of natural gas and further promote the accumulation of shallow gas. Therefore, there are positive feedback interactions between the formation of gas hydrate and the development of shallow gas, which are conducive to the formation of larger gas hydrate ore bodies and shallow gas reservoirs, and have good commercial development potential.
- gas hydrate,
- shallow gas,
- gas hydrate-shallow gas symbiotic system,
- accumulation model,
- Qiongdongnan basin,
- petroleum geology

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References(55)

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Accumulation Characteristics of Gas Hydrate-Shallow Gas Symbiotic System in Qiongdongnan Basin

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