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为了准确评价CO_2气藏资源,研究了CO_2气在地下的扩散机制;分析了CO_2气在地层剖面上的扩散特征;并根据芳深9井CO_2气各扩散参数,估算了该气藏的累积扩散损失量。结果表明,CO_2气分子在地层水中主要以水合形式存在,在水中的溶解能力主要受其所处温度、压力条件及水矿化度的影响。随着CO_2气在地层水中溶解能力的变化,CO_2气在地层剖面上的扩散分为3段,小于0.50km埋深范围内,CO_2气向上扩散,作用较强;0.50～1.25km埋深中,CO_2气向下扩散;大于1.25km埋深,CO_2气向上扩散,作用较弱。芳深9井CO_2气藏最大损失量约为23.5×10~8m~3,约占其地质储量的17.5％。
In order to accurately evaluate the CO_2 gas reservoir resources, the diffusion mechanism of CO_2 gas in the ground was studied. The diffusion characteristics of CO_2 gas in the stratigraphic section were analyzed. According to the diffusion parameters of CO_2 gas in Fangshen 9 well, the cumulative diffusion of this gas reservoir Loss The results show that the molecules of CO_2 are mainly hydrated in formation water, and their dissolving ability in water is mainly affected by the temperature, pressure conditions and water salinity. With the change of dissolving ability of CO_2 gas in formation water, the diffusion of CO_2 gas in the stratigraphic section is divided into three sections. Within the depth of less than 0.50km, the CO_2 gas diffuses upward and is strong. In the depth of 0.50 ~ 1.25km, CO_2 gas is diffused downward; when the depth is greater than 1.25km, the CO_2 gas diffuses upward and the effect is weaker. The maximum loss of CO_2 gas reservoirs in Fangshen 9 well is about 23.5 × 10 ~ 8m ~ 3, accounting for 17.5% of its geological reserves.