琼东南盆地水合物富集区储层特征及勘探启示

樊奇; 朱振宇; 庞维新; 李清平; 周松望; 李元平

doi:10.3799/dqkx.2023.123

Volume 49 Issue 4

Apr. 2024

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Article Navigation > Earth Science > 2024 > 49(4): 1421-1430

Fan Qi, Zhu Zhenyu, Pang Weixin, Li Qingping, Zhou Songwang, Li Yuanping, 2024. Reservoir Characteristics and Exploration Implications of Gas Hydrate Enrichment Area, Qiongdongnan Basin. Earth Science, 49(4): 1421-1430. doi: 10.3799/dqkx.2023.123

Citation:

Fan Qi, Zhu Zhenyu, Pang Weixin, Li Qingping, Zhou Songwang, Li Yuanping, 2024. Reservoir Characteristics and Exploration Implications of Gas Hydrate Enrichment Area, Qiongdongnan Basin. Earth Science, 49(4): 1421-1430. doi: 10.3799/dqkx.2023.123

Citation:

Fan Qi, Zhu Zhenyu, Pang Weixin, Li Qingping, Zhou Songwang, Li Yuanping, 2024. Reservoir Characteristics and Exploration Implications of Gas Hydrate Enrichment Area, Qiongdongnan Basin. Earth Science, 49(4): 1421-1430. doi: 10.3799/dqkx.2023.123

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Reservoir Characteristics and Exploration Implications of Gas Hydrate Enrichment Area, Qiongdongnan Basin

doi: 10.3799/dqkx.2023.123

Fan Qi^{1, 2
,
,},
Zhu Zhenyu¹,
Pang Weixin^{1, 2},
Li Qingping^{1, 2},
Zhou Songwang³,
Li Yuanping⁴

1.
Research Institute, China National Offshore Oil Corporation, Beijing 100028 China
2.
State Key Laboratory of Gas Hydrates, Beijing 102209, China
3.
Geophysical Exploration Division, China Oilfield Services Limited, Tianjin 300450, China
4.
Research Institute of CNOOC Shenzhen Branch, Shenzhen 518054, China

Received Date: 2022-12-27
Available Online: 2024-04-30
Publish Date: 2024-04-25

Abstract

Abstract

Gas hydrate is an important development of marine new energy, and the Qiongdongnan basin of the South China Sea is a hydrate enrichment and hot research area. In order to further understand hydrate reservoir characteristics of the Qiongdongnan area, thermal insulation and pressuring coring sampled by domestic technical equipment were selected for analysis and first-hand data were obtained. By comprehensive analysis of grain size, rock and mineral analysis (including electron microscope scanning), LWD, thermal imaging, chloride ion saturation method, etc., it is measured that the reservoir is mainly composed of siliceous and aluminous clay deposits composed of quartz (23% content), plagioclase (17% content), sericite (15% content), albite (14% content), etc., and the median grain size of reservoir is 15.1 μm to 34.1μm and the saturation distribution is 3% to 54%. It reveals six characteristics of hydrate reservoir: "fine-grained, unconsolidated, easily disintegrate and disperse, high resistance, high acoustic velocity, and strong heterogeneity". Combined with gas source, reservoir analysis and exploration knowledge, a reservoir formation model of "off-site thermogenic gas injection, local microbial gas supplement, accumulation at top of gas chimney, and horizontal formation in the submarine fan reservoir" has been established. Focusing on the X-ray and CT scanning of 123 mbsf and 153 mbsf in-situ pressure-retaining cores, two main types of reservoirs are identified: argillaceous silt pore-type reservoir (submarine fan) and argillaceous silt micro-fractured reservoir (gas chimney fluid reconstruction), a new discovered type of hydrate reservoirs in the South China Sea. Exploration inspirations are put forward, "study the occurrence and resource potential of shallow scaled sand-bodies of geological events in the Zhujiangkou and Qiongdongnan sea, and strengthen research on heat and mass transfer of reservoir formation mechanism and resource evaluation".The research will provide important scientific reference for hydrate research and production test of the South China Sea.
- reservoir characteristics,
- fine-grained,
- unconsolidated,
- exploration inspirations,
- gas hydrate,
- Qiongdongnan basin,
- marine geology

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References(36)

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Reservoir Characteristics and Exploration Implications of Gas Hydrate Enrichment Area, Qiongdongnan Basin

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