盐水层地质参数对CO_(2)封存效果的评价  

Evaluation of CO_(2)storage effected by geological parameters of brine layer

作　　者：张琳琳 赖枫鹏[1,2] 董银涛 戴玉婷 ZHANG Linlin;LAI Fengpeng;DONG Yintao;DAI Yuting(School of Energy,China University of Geosciences(Beijing),Beijing 100083,China;Beijing Key Laboratory of Unconventional Natural Gas Geological Evaluation and Development Engineering,Beijing 100083,China;CNOOC Research Institute,Beijing 100028,China;Research Institute of Exploration and Development,Changqing Oilfield Company,PetroChina,Xi’an 710018,China;Supplies Department,Changqing Oilfield Company,PetroChina,Xi’an 710016,China)

机构地区：[1]中国地质大学(北京)能源学院,北京100083 [2]非常规天然气能源地质评价与开发工程北京市重点实验室,北京100083 [3]中海油研究总院有限责任公司,北京100028 [4]中国石油长庆油田分公司勘探开发研究院,陕西西安710018 [5]中国石油长庆油田分公司物资供应处,陕西西安710016

出　　处：《煤炭学报》2024年第9期3932-3943,共12页Journal of China Coal Society

基　　金：国家自然科学基金资助项目(52174037)。

摘　　要：在二氧化碳捕集、利用与封存技术中,盐水层封存CO_(2)由于具有分布面积广和封存潜力大等多重优势,逐渐成为应对全球气候变暖、实现2050年世界净零目标、减少CO_(2)排放的有效方法。为提高盐水层中CO_(2)的封存效果,以国内外现有的相关地质封存项目数据为基础,采用Petrasim软件中的TOUGHREACT/ECO_(2)N模块,选取CO_(2)溶解质量和气态CO_(2)饱和度为评价指标,通过数值模拟方法,从盐溶液体系和储层物性参数2个方面,揭示地层盐水盐度、地层盐水组分、地层压力、地层温度和渗透率5个地质参数对盐水层CO_(2)封存的影响机制,并定量评价CO_(2)封存效果。结果表明:①各地质参数主要通过改变CO_(2)、地层盐水的密度和黏度、CO_(2)溶解度以及CO_(2)–盐水–岩石的化学反应等,进而控制地层流体的溶解度、流动性和传质性;②CO_(2)的溶解度和地层盐水密度分别随盐度的增加而降低、增大,但前者受其影响程度更大,从而盐度对CO_(2)的溶解表现出抑制作用,因此低盐度的盐水层更有助于增加CO_(2)封存量及提高埋存安全性;③根据苏林分类法得到的4种盐溶液组分中,CaCl_(2)水型对应的CO_(2)溶解质量略低于其他3种水型,但整体上不同盐溶液组分对CO_(2)封存效果影响不大;④在CO_(2)溶解度和气液两相黏度比的共同作用下,CO_(2)溶解质量随压力和温度的增大而减少,气态CO_(2)饱和度变化相反;渗透率对气体流动性和运移距离起直接控制作用,因此地层压力和温度越低,渗透率越大的盐水层越有利于CO_(2)封存。In the practice of carbon dioxide capture,utilization and storage,the storage of CO_(2)in salt water layer has gradually become an effective way to deal with global warming,achieving the goal of net zero in 2050 and reducing CO_(2)emissions due to its multiple advantages such as wide distribution area and large storage potential.TOUGHREACT/ECO_(2)N module in the Petrasim software was adopted to improve the storage efficiency of CO_(2)in brine reservoirs.Based on the existing data of relevant geological storage projects in China and other countries,the numerical simulation method was used to evaluate the CO_(2)dissolution quality and gaseous CO_(2)saturation.The influence mechanism of five geological parameters of formation brine salinity,composition of formation brine,formation pressure,formation temperature and permeability on CO_(2)sequestration was revealed,and the effect of CO_(2)sequestration was quantitatively evaluated.The results show that:①the geological parameters control the solubility,fluidity and mass transfer of formation fluids by changing the density and viscosity of CO_(2),formation brine,CO_(2)solubility and the chemical reaction of CO_(2)-brine and rock.②The solubility of CO_(2)and the density of formation brine decrease and increase with the increase of salinity respectively,with the former being mostly affected.The salinity has an inhibitory effect on the dissolution of CO_(2).Therefore,the brine layer with low salinity is more conducive to increasing the storage capacity of CO_(2)and improving the storage safety.③Among the four salt solution components obtained according to the Sulin classification method,the CO_(2)dissolution quality corresponding to CaCl_(2) water type is slightly lower than that of the other three water types.Overall,different salt solution components have little influence on the effect of CO_(2)storage.④Under the combined effect of CO_(2)solubility and gas-liquid two-phase viscosity ratio,the dissolved mass of CO_(2)decreases with the increase of pressure and tem

关 键 词：盐水储层 CO_(2)地质封存 地质参数 CO_(2)溶解质量 气态CO_(2)饱和度 

分 类 号：X701[环境科学与工程—环境工程]