典型文献
Velocity-porosity relationships in hydrate-bearing sediments measured from pressure cores, Shenhu Area, South China Sea
文献摘要：
Evaluating velocity-porosity relationships of hydrate-bearing marine sediments is essential for characterizing natural gas hydrates below seafloor as either a potential energy resource or geohazards risks. Four sites had cored using pressure and non-pressure methods during the gas hydrates drilling project (GMGS4) expedition at Shenhu Area, north slope of the South China Sea. Sediments were cored above, below, and through the gas-hydrate-bearing zone guided with logging-while-drilling analysis results. Gamma density and P-wave velocity were measured in each pressure core before subsampling. Methane hydrates volumes in total 62 samples were calculated from the moles of excess methane collected during depressurization experiments. The concentration of methane hydrates ranged from 0.3％ to 32.3％. The concentrations of pore fluid (25.44％ to 68.82％) and sediments (23.63％ to 54.28％) were calculated from the gamma density. The regression models of P-wave velocity were derived and compared with a global empirical equation derived from shallow, unconsolidated sediments data. The results were close to the global trend when the fluid concentration is larger than the critical porosity. It is concluded that the dominant factor of P-wave velocity in hydrate-bearing marine sediments is the presence of the hydrate. Methane hydrates can reduce the fluid concentration by discharging the pore fluid and occupying the original pore space of sediments after its formation.
文献关键词：
中图分类号：
作者姓名：
Lin Lin;Jun Cao;Jin Qian;Jiu-jing Shang;Wei Zhang;Jin-gan Lu;Jin-qiang Liang
作者机构：
Guangzhou Marine Geological Survey,China Geological Survey,Ministry of Natural Resources,Guangzhou 510760,China;Southern Marine Science and Engineering Guangdong Laboratory(Guangzhou),Guangzhou 511458,China;Institution of Oceanology,Chinese Academy of Sciences,Qingdao 266071,China
文献出处：
引用格式：
[1]Lin Lin;Jun Cao;Jin Qian;Jiu-jing Shang;Wei Zhang;Jin-gan Lu;Jin-qiang Liang-.Velocity-porosity relationships in hydrate-bearing sediments measured from pressure cores, Shenhu Area, South China Sea)[J].中国地质（英文）,2022(02):267-275
A类：
GMGS4,subsampling,moles
B类：
Velocity,porosity,relationships,bearing,sediments,measured,from,pressure,cores,Shenhu,Area,South,China,Sea,Evaluating,velocity,marine,essential,characterizing,natural,gas,hydrates,below,seafloor,either,potential,energy,resource,geohazards,risks,Four,sites,had,cored,using,methods,during,drilling,project,expedition,north,slope,Sediments,were,above,through,zone,guided,logging,while,analysis,results,Gamma,density,wave,each,before,Methane,volumes,total,samples,calculated,excess,methane,collected,depressurization,experiments,ranged,concentrations,pore,fluid,gamma,regression,models,derived,compared,global,empirical,equation,shallow,unconsolidated,data,close,trend,when,larger,critical,It,concluded,that,dominant,presence,can,reduce,by,discharging,occupying,original,space,after,its,formation
AB值：
0.509756
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