The Diffusion Model and Computation Method of Diffusion Quantification for Natural Gas
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摘要: 盖层的存在是天然气成藏和保存的必要条件之一,而浓度封闭又是盖层的一种重要的封闭机理。在前人工作的基础上,研究了浓度封闭的机理,进一步系统建立了天然气扩散的地质和数学模型,并给出了模型的初始化条件,对天然气扩散量的计算方法作了讨论。Abstract: Cap rock is the necessary condition of the gas reservoir preservation, and hydrocarbon concentration confining is one important confining mechanism. The geological and mathematical model of natural gas diffusion has been set up system atically. The natural gas diffusion is mainly through the water, so the solubility of the natural gas in water can be regarded as theinitial gas concentration in the cap rock. The solubility of the natural gas can be calculate by the determination of the temperature, pressure and salini-ty of the stratum. The source rock is usually of relatively larger solubility, so it is the best cap rock.
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Key words:
- natual gas /
- diffusion /
- model /
- cap rock
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[1] .王绍亭. 动量、热量与质量传递. 天津: 天津科学技术出版社, 1986 [2] .Krooks B M. The quantification of diffusive hydrocarbon losses through cap rocks of natural gas reservoir-A reevaluation, AAPG, 1992, 76: 403~406 [3] .黄志龙, 郝石生. 天然气扩散与浓度封闭作用的研究. 石油学报, 1996, 17(4): 36~40 [4] .郝石生, 张振英. 天然气在地层水中的溶解度变化特征及地质意义. 石油学报, 1993, 14(2): 12~22 -

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