典型文献
Geochemical Characteristics and Gas-to-Gas Correlation of Two Leakage-type Gas Hydrate Accumulations in the Western Qiongdongnan Basin, South China Sea
文献摘要：
In recent years, a series of highly saturated leakage-type gas hydrates have been discovered in the western Qiongdongnan Basin (QDNB), South China Sea. Based on the molecular compositional and isotopic characteristics of the gas samples relevant to the gas hydrates collected from the two leakage-type gas hydrate accumulations in the GMGS5 and GMGS6 drilling zones, a detailed geochemical gas-to-gas correlation was conducted in this study, in order to further understand the geochemical characteristics and possible hydrocarbon sources of these gas hydrates. The natural gas relevant to the gas hydrates in the GMGS5 block is characterized by wet gas (67.96% < %C1 < 98.58%, C1/C1+ < 0.9) and significant molecular and carbon isotope fractionation within the depth profile, whereas the gas samples from the GMGS6 block exhibit the characteristics of dry gas (99.25% < %C1 < 99.81%, C1/C1+ > 0.9) and lack molecular and carbon isotope fractionation. Approximately 40%–60% of the methane within the gas hydrate is of microbial origin, while the C2+ gas components are typical coal-type gas that are derived from thermogenic source rocks or deeply-buried natural gas fields. In addition, typical in situ primary microbial methane (?80.6‰ < δ13C-C1 < ?67.7‰) was discovered in well Wb, which was applied to estimate the contribution of the microbial gas to the gas hydrates. The gas-to-gas correlation results show that the hydrate gases within the two leakage-type gas hydrate accumulations in the GMGS5 and GMGS6 blocks are geochemically different, suggesting that they may have been derived from different source kitchens. Our results further indicate that the deeply-buried thermogenic gas significantly contributed to the shallowly-buried gas hydrates in the western QDNB and multiple effective thermogenic source kitchens provided the hydrocarbon gas in the gas hydrate accumulations.
文献关键词：
中图分类号：
作者姓名：
LAI Hongfei;QIU Haijun;LIANG Jinqiang;KUANG Zenggui;FANG Yunxin;REN Jinfeng;LU Jing’an
作者机构：
Southern Marine Science and Engineering Guangdong Laboratory (Guangzhou),Guangzhou 511458,China;MNR Key Laboratory of Marine Mineral Resources,Guangzhou Marine Geological Survey,Ministry of Natural Resources,Guangzhou 510075,China
文献出处：
引用格式：
[1]LAI Hongfei;QIU Haijun;LIANG Jinqiang;KUANG Zenggui;FANG Yunxin;REN Jinfeng;LU Jing’an-.Geochemical Characteristics and Gas-to-Gas Correlation of Two Leakage-type Gas Hydrate Accumulations in the Western Qiongdongnan Basin, South China Sea)[J].地质学报（英文版）,2022(02):680-690
A类：
Accumulations,QDNB,GMGS5,GMGS6,C1+,shallowly
B类：
Geochemical,Characteristics,Gas,Correlation,Two,Leakage,type,Hydrate,Qiongdongnan,Basin,South,China,Sea,In,recent,years,series,highly,saturated,leakage,hydrates,have,been,discovered,western,Based,molecular,compositional,isotopic,characteristics,samples,relevant,collected,from,two,accumulations,drilling,zones,detailed,correlation,was,conducted,this,study,order,further,understand,possible,hydrocarbon,sources,these,natural,characterized,by,wet,isotope,fractionation,within,depth,profile,whereas,exhibit,dry,lack,Approximately,methane,microbial,origin,while,C2+,components,are,typical,coal,that,derived,thermogenic,rocks,deeply,buried,fields,addition,situ,primary,13C,well,Wb,which,applied,estimate,contribution,results,show,gases,blocks,geochemically,different,suggesting,they,may,kitchens,Our,indicate,significantly,contributed,multiple,effective,provided
AB值：
0.401537
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