Velocity-porosity relationships in hydrate-bearing sediments measured from pressure cores, Shenhu Area, South China Sea
文献类型：CNKI期刊论文
| 作者 | Lin Lin; Jun Cao; Jin Qian; Jiu-jing Shang; Wei Zhang; Jin-gan Lu; Jin-qiang Liang |
| 发表日期 | 2022-04-25 |
| 出处 | China Geology
 |
| 关键词 | Natural gas hydrates (NGHs) Methane hydrate P-wave velocity Porosity Saturation Pressure-core NGHs exploration trial engineering Oil and gas exploration engineering Shenhu Area South China Sea |
| 英文摘要 | 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. |
| 文献子类 | CNKI期刊论文 |
| 资助机构 | jointly supported by the National Natural Science Foundation of China (42076072) ; the project of China Geological Survey (DD20160211) ; the Key Special Project for Introduced Talents Team of Southern Marine Science and Engineering Guangdong Laboratory (Guangzhou, GML2019ZD0506) |
| 卷 | v.5期:02页:73-81 |
| 语种 | 英文; |
| 分类号 | P618.13 |
| ISSN号 | 2096-5192 |
| 源URL | [http://ir.qdio.ac.cn/handle/337002/187446]  |
| 专题 | 中国科学院海洋研究所 |
| 作者单位 | 1.GuangzhouMarineGeologicalSurvey,ChinaGeologicalSurvey,MinistryofNaturalResources 2.SouthernMarineScienceandEngineeringGuangdongLaboratory(Guangzhou) 3.InstitutionofOceanology,ChineseAcademyofSciences |
| 推荐引用方式 GB/T 7714 | Lin Lin,Jun Cao,Jin Qian,et al. Velocity-porosity relationships in hydrate-bearing sediments measured from pressure cores, Shenhu Area, South China Sea. 2022. |
入库方式： OAI收割
来源：海洋研究所
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