CO_(2)地质封存数值模拟研究

Numerical Simulation Study of CO_(2)Geological Storage

随着经济和社会的快速发展,世界各国对于温室气体排放所引起的全球变暖问题越来越重视。我国作为全球最大的CO_(2)排放国,短期内以煤炭及煤电为主的基本能源结构模式很难有根本转变,面临十分严峻的减排形势。CO_(2)的减排问题已成为制约该地区能源化工产业发展的最大瓶颈之一,为了满足经济社会可持续发展的迫切需要,我们必须采取措施来控制CO_(2)的大量排放。CO_(2)地质封存已成为一种日益成熟的技术方法,并已成为了目前全球公认的进行CO_(2)大规模减排的最有效途径之一。页岩储层CO_(2)地质封存联合页岩气增采技术(CO_(2)-ESGR)是一种新型的CO_(2)地质封存及页岩气开发技术。该技术以超临界或液相CO_(2)代替水力压裂页岩,利用CO_(2)吸附页岩能力比CH_(4)强的特点,置换CH_(4),从而提高页岩气产量和生产速率并实现CO_(2)地质封存,减少温室气体排放。主要以鄂尔多斯盆地为例,围绕页岩储层中CO_(2)地质封存增强页岩气开采技术,以数值模拟的方法建立二维数值模型,一方面主要想要表现经过研究发现新型的碳封存的方法,页岩储层中的CO_(2)吸附封存、残余封存、溶解封存以及矿化封存,在不同的条件下(温度、地层水盐度、矿物组成等)的CO_(2)有不同的演化过程,另一方面研究了在鄂尔多斯盆地中开采页岩气技术,探索研究页岩气在储层中开采时所受的影响因素,在这些基础上发现问题及时优化模型,在保证安全的前提下来提高页岩气的采收率。

With the rapid development of the economy and society,countries around the world are paying more and more attention to the problem of global warming caused by greenhouse gas emissions.As the world's largest CO_(2)emitter,it is difficult to fundamentally change the basic energy structure model based on coal and coal power in the short term,and it is facing a very severe emission reduction situation.CO_(2)emission reduction has become one of the biggest bottlenecks restricting the development of the energy and chemical industry in the region,in order to meet the urgent need for sustainable economic and social development,we must take measures to control a large number of CO_(2)emissions.CO_(2)geological storage has become an increasingly mature technical method and has become one of the most effective ways to reduce CO_(2)emissions on a large scale.Shale reservoir CO_(2)geological storage combined with shale gas enhancement technology(CO_(2)-ESGR)is a new type of CO_(2)geological storage and shale gas development technology.This technology replaces hydraulic fracturing shale with supercritical or liquid CO_(2),and replaces CH_(4)by using the characteristics of CO_(2)adsorption capacity stronger than CH_(4),thereby improving shale gas production and production rate,achieving CO_(2)geological storage,and reducing greenhouse gas emissions.This paper mainly takes the Ordos Basin as an example,around the shale reservoir CO_(2)geological storage enhancement shale gas mining technology,the two-dimensional numerical model is established by numerical simulation method,on the one hand,it mainly wants to show the new carbon sequestration method found through research,CO_(2)adsorption capture,residual capture,dissolution capture and mineralized capture in shale reservoirs,and CO_(2)has different evolution processes under different conditions(temperature,formation water salinity,mineral composition,etc.).On the other hand,the technology of mining shale gas in the Ordos Basin is studied,the influencing factors of shale gas mining in the reservoir are explored and studied,and the problems are found on these basis,and the model is optimized in time to improve the recovery of shale gas under the premise of ensuring safety.