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在深入分析影响天然气扩散作用因素的基础上,认为浓度是天然气发生扩散的根本原因。指出:不同浓度适用于不同的地质条件,游离相含气浓度适用于天然气在不含水岩石中的扩散;水中溶气浓度适用于天然气在饱和水岩石中扩散,认为孔隙水中总溶气浓度较孔隙水间填充溶气浓度更符合天然气在地下岩石中扩散的实际情况;采用不同的浓度计算得到的天然气扩散量大小是不同的,采用游离相含气浓度计算得到天然气扩散量较实际值偏大,而采用孔隙水间隙填充溶气浓度计算得到的天然气扩散量又较实际值偏小,只有采用孔隙水中总溶气浓度计算得到的天然气扩散量才符合实际情况,孔隙水中的总溶气浓度是引起天然气在地下岩石中发生扩散的真正浓度。
Based on the in-depth analysis of the factors affecting the diffusion of natural gas, it is considered that the concentration is the fundamental reason for the diffusion of natural gas. It is pointed out that different concentrations are suitable for different geological conditions and that the concentration of free phase gas is suitable for the diffusion of natural gas in non-water-bearing rocks. The concentration of dissolved gas in water is suitable for the diffusion of natural gas in saturated water rocks and the total dissolved gas concentration in pore water The dissolved gas concentration in water is more in line with the actual situation of natural gas diffusion in underground rocks. The diffusion of natural gas calculated by different concentrations is different. The diffusion of natural gas is larger than the actual value calculated by the free-air gas concentration, However, the natural gas diffusion calculated by using dissolved gas concentration in pore water gap is smaller than the actual value, and only the natural gas diffusion calculated by the total dissolved gas concentration in pore water is in accordance with the actual situation. The total dissolved gas concentration in pore water is caused The true concentration of natural gas that diffuses into underground rocks.