咸水层中二氧化碳地质封存有效系数的探究——以江汉盆地为例

Research on the Effective Coefficient of CO_2 Geological Sequestration in Salinity Aquifer——A Case Study of Jianghan Basin

二氧化碳(CO2)地质封存技术经过近年来的发展,在理论和实际应用方面已越来越成熟,许多试点工程也已经启动,因此根据不同地区的封存条件,计算出相对精确的有效封存量是非常有必要的。目前计算有效封存量时使用的CO2地质封存有效系数E仅反映了CO2占据整个孔隙体积的比例,还有很多敏感性因子尚未考虑,严重影响了CO2有效封存量的计算精度。依托江汉盆地的基础地质资料,通过建立二维储盖层模型,并设置不同的边界条件、注入模式和盐度等影响因子来进行CO2灌注的数值模拟研究,并通过模拟得出的数据,建立起一套不同敏感性因子对于CO2地质封存有效系数的影响模型。

After years of development, the technology of CO2 geological sequestration has been improved a lot in theoretical field and thus more and more pilot projects have started. So,calculating lhe relatively ac curate effective sequestration according to certain storage conditions is of great necessity. At present, be cause of lacking certain sensitive factors,the effective coefficient E calculated only reflected the proporlion of CO2 occupying the whole pore volume, which seriously influenced the accuracy of the calculation of seal inventory. By using the two-dimensional model and setting up different boundary conditions, injection mode and salinity sensitive factors,this paper uses the geological data of Jianghan Basin to simulate the CO2 per fusion. Based on the outcome from the simulation,the paper also establishes a set of models that estimate the different sensitive factors influencing the effective coefficient of CO2 geological sequestration.