摘要
在“双碳”愿景下,CCUS(carbon capture, utilization and storage)技术成为我国减少CO_(2)排放、保障能源安全和实现可持续发展的关键手段,而定量评价CO_(2)含量是CCUS技术中亟需解决的问题。本研究基于中子在地层中的扩散理论,分析了中子反应截面和减速长度等参数定量评价CO_(2)的方法,利用蒙特卡罗方法建立计算模型,模拟快中子在含CO_(2)和CH_(4)地层介质的作用过程,研究快中子散射截面、宏观俘获截面及减速长度等参数与CO_(2)和CH_(4)饱和度的变化关系,结果表明,在一定孔隙度条件下,减速长度相比快中子散射截面和宏观俘获截面在识别CO_(2)和CH_(4)的动态变化灵敏度更高,且区分CH_(4)和CO_(2)混合流体的响应更明显。研究结果为利用D-T中子源和多探测器测井仪定量评价CO_(2)仪器设计和数据处理方法奠定基础,对发展CCUS技术具有重要意义。
Under the vision of“dual-carbon”,CCUS(carbon capture,utilization and storage)technology has become a key means to reduce CO_(2) emission,ensure energy security and realize sustainable development in China,while quantitatively evaluating CO_(2) content is an urgent problem in CCUS technology.This paper,based on the theory of neutron diffusion in the formation,analyzes methods for quantitatively assessing CO_(2) using neutron reaction cross-sections and deceleration length.Using the Monte Carlo method,a computational model was established to simulate the interaction of fast neutrons with CO_(2) and CH_(4)-bearing stratigraphic media,and to study the variation rules of parameters such as scattering cross section,macroscopic capture cross section,and deceleration length of fast neutrons and the saturation degree of CO_(2) and CH_(4),in order to screen the neutron logging methodology of quantitative evaluation of CO_(2).The simulation results show that under certain porosity conditions,the deceleration length is more obvious than the fast neutron scattering cross section and macroscopic capture cross section in recognizing the dynamic changes of CO_(2) and oil and water,and it can distinguish between CH_(4) and CO_(2).These findings provide a foundation for designing instruments and data processing methods for quantitative CO_(2) evaluation using D-T neutron sources and multi-detector logging systems,which is of significant importance for the development of CCUS technology.
作者
李政
赵海华
张锋
LI Zheng;ZHAO Haihua;ZHANG Feng(School of Geoscience,China university of petroleum(East China),Qingdao 266580,China;State Key Laboratory of Deep Oil and Gas,China University of Petroleum(East China),Qingdao 266580,China;Laoshan Laboratory,Qingdao 266580,China)
出处
《同位素》
2025年第5期454-462,共9页
Journal of Isotopes
基金
国家自然科学基金面上项目(42174174,41974127,4247040492)。
