摘要
在深入分析天然气发生分子扩散机理的基础上，指出天然气在地层孔隙中的扩散主要是填充在水分子间隙中那部分天然气分子的扩散，决定天然气发生扩散作用的是地层孔隙水中的间隙填充溶气浓度，而不是地层孔隙水中的总溶气浓度。低温条件下间隙填充溶气浓度小，天然气扩散作用弱，而高温条件下间隙填充溶气浓度大，天然气扩散作用强。利用地层孔隙水中的总溶气浓度研究天然气扩散，在低温条件下会相对夸大扩散量，在高温条件下则会相对低估扩散量。
Based on the in-depth analyses on diffusion mechanisms and characteristics of gas molecules in subsurface strata, this paperpoints out that the diffusion of gas in strata is dominated by that diffusion of the gas molecules filling into the interstice ofwater molecules. The gas concentration, at which the gas diffusion takes place, is that of gas interstitially dissolved in theinterstice of water in the pores of formations, but not the total dissolved gas concentration of the water in the pores offormations. At low temperature, the interstitially gas-dissolved concentration is low and gas diffusion is weak, but at hightemperature, the concentration is high and the diffusion is strong. The diffusion amount of gas calculated by the total gasdissolved concentration in the water of formation pores is exaggerated at low temperature and underestimated at hightemperature.
出处
《石油勘探与开发》
SCIE
EI
CAS
CSCD
北大核心
1997年第3期86-88,共3页
Petroleum Exploration and Development
关键词
天然气
扩散
岩石孔隙
隙间水
油气地质
Natural gas, Diffusion, Rock pore, Interstitial water, (Gas-dissolved concentration)
