Gas sources and its implications for hydrate accumulation in the eastern Pearl River Mouth Basin
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摘要:
通过钻探，在珠江口盆地东部海域获取了天然气水合物实物样品，在5个取心站位目标层段进行了保压取心，获取了水合物岩心释放气样品，同时在13个层段获取了水合物分解气体样品。钻探取心的5个站位都在航次现场选择层段制备了顶空气样品。所有气体均进行了气体组成与同位素分析，结果表明：水合物气体组成以甲烷占绝对优势，甲烷含量96.5%~99.8%;乙烷含量极少，为(175~554)×10-6，未检测出C2+以上烃类气体。水合物气体甲烷碳-氢同位素分析测试结果表明，δ13C1为-68.4‰~-71.2‰，δDC1为-182‰~-184‰，据此判识水合物气体成因类型为生物成因气。水合物气源成因类型与水合物产出形态没有直接关系，多种产出类型的水合物可能与储层发育及形态特征有密切联系。主要气源位于1000m以内的浅地层中，主要以侧向运移方式运移至稳定域有利部位形成水合物。
Abstract:Pressure cores and void gas samples are collected by drilling from target layers at five coring sites in the eastern Pearl River Mouth Basin. Dissociation gas is also sampled in thirteen layers, while headspace gas samples acquired at all the five sites. All gas samples have been tested for chemical and isotopic compositions. The gas is methane dominated, which is up to 96.5%~99.8% in concentration. Trace amount of ethane is also detected in concentration of (175~554)×10-6. No C2+ hydrocarbons have been found in all the gas samples. The isotopes of carbon and hydrogen of the methane suggest that δ13C1 is in the range of -68.4‰~-71.2‰, with δDC1 from -182‰ to -184‰, indicating a biogenic origin. The gas source of hydrate is not directly related to the occurrence of hydrate, while hydrate with multiple sources seems closely related to the evolution and morphological characteristics of reservoir. The main gas source area is located in the shallow strata less than 1000m in depth, suggesting that the hydrocarbon has migrated to the favorable stability zone to form gas hydrate accumulation by shallow lateral migration.
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Key words:
- natural gas hydrate /
- gas source /
- genetic type /
- biogenic gas /
- eastern Pearl River Mouth Basin
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表 1 GMGS2航次保压岩心样品释放气体组成及稳定同位素值
Table 1. Gas composition and stable-isotope of depressured gas recovered from the GMGS2 expedition
岩心编号 层段/mbsf CH4/% C2H6/10-6 O2/% N2/% CO2 /% C1/C2 δ13C/‰ δD/‰ GMGS2-05-1 58.0 71.3 - 5.0 23.0 0.7 - - - GMGS2-08-1 17.19 99.6 480 - 0.2 0.15 2073 -70.7 -183 GMGS2-08-2 17.59 99.4 308 - 0.5 0.04 3223 -69.9 -184 GMGS2-08-3 74.13 99.7 401 - 0.1 0.17 2488 -70.4 -183 GMGS2-08-4 74.98 98.8 554 - 0.8 0.37 1785 -69.5 -184 GMGS2-08-5 75.09 99.8 393 - 0 0.13 2537 -69.8 -182 GMGS2-09-1 29.86 99.6 378 - 0.1 0.23 2638 - - GMGS2-16-1 18.0 98.7 308 - 1.0 0.08 3182 -71.2 -183 GMGS2-16-2 200.72 97.5 175 - 2.0 0.09 5424 -68.8 -184 GMGS2-16-3 201.23 98.1 291 - 1.0 0.05 3327 -68.4 -183 GMGS2-16-4 201.59 98.7 254 - 1.0 0.04 3874 -68.7 -184 GMGS2-16-5 201.7 96.5 208 1.0 3.0 0 4443 -69.4 -184 GMGS2-16-6 201.92 98.9 272 - 1.0 0.05 3541 -68.4 -183 
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