期刊
JOURNAL OF NATURAL GAS SCIENCE AND ENGINEERING
卷 83, 期 -, 页码 -出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.jngse.2020.103626
关键词
Gas permeability; Natural sediments; Shape factor; Porosity; Confining pressure; South China Sea
资金
- Key Program of National Natural Science Foundation of China [51736009]
- National Natural Science Foundation of China [51676196, 51976228]
- Guangdong Special Support Program [2019BT02L278]
- Frontier Sciences Key Research Program of the Chinese Academy of Sciences [QYZDJ-SSWJSC033, QYZDB-SSW-JSC028]
- Science and Technology Apparatus Development Program of the Chinese Academy of Sciences [YZ201619]
- National Key R&D Program of China [2017YFC0307306]
- Special Project for Marine Economy Development of Guangdong Province [GDME-2018D002, GDME-2020D044]
The permeability measurement of marine natural sediments is helpful to evaluate the characteristics of seawater immersion in the sediment layer and the difficulty of upward escape of gas below the sediments. In this work, the stress on the natural sediments in the Shenhu Area of the South China Sea with different buried depths was simulated by confining pressure. The effective gas permeability of natural sediments with different initial porosities during confining pressure loading and unloading was investigated. Experimental results indicated that the gas permeability was very sensitive to particle size distribution, confining pressure and initial porosity of the sediments. The gas permeability of sediments decreased with the increase of confining pressure and the decrease of porosity. The isoline of porosity related to gas permeability was obtained, and this isoline could predict the gas permeability of natural sediments in the South China Sea under different porosities and buried depths. The particle size term in the Kozeny-Carman equation was modified by particle size correction factor N, and the uneven particle size distributions of four natural sediments could be eliminated when N was about 2.44. The specific surface areas of four natural sediments increased with the increase of buried depth. Finally, a new model for the calculation of shape factor was proposed, and this model showed practical performance in predicting the shape factors of natural sediments.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据