CO_2地质埋存监测技术及其应用分析

Monitoring techniques of CO_2 geological storage and its application analysis

对CO2地质埋存监测目的和意义进行阐述,对地震、重力测试、井流体取样、示踪剂及CO2泄露等主要监测技术的原理、特点和应用进行分析,监测系统及相应的监测技术可对储层、盖层和周围环境进行描述,概括总结监测技术的研究进展和发展趋势。结果表明:示踪剂、井流体取样和测井技术是监测储层内流体运移和CO2状态以及油藏和井完整性的有效手段;土壤气体分析和大气监测能够有效地监测CO2泄漏和地表环境,监测系统的优化设计要结合监测目的和储层条件,根据现有的技术水平及应用经验合理筛选监测技术,可以经济有效安全地对注入CO2的状态和泄漏进行监测。

The purpose and importance of various monitoring methods that can be used in different stages of the CO2 storage process were addressed.Different monitoring mechanisms and corresponding techniques were described.The monitoring on CO2 storage can be applied to different systems including reservoir,sub-surface and surrounding environment,and various techniques such as 4D seismic,gravity metering,soil gas sampling,well fluid sampling and gas tracers can be used.The advantages and limitations of these techniques were analyzed along with field application experience.The results show that gas tracer,well fluid sampling and logging can be used to track the fluid migration and CO2 state in conjunction with verifying well reservoir integrity,while soil gas and atmosphere measurements are effective to monitor the CO2 leakage and subsurface environment.The selection of monitoring techniques should take the purpose of monitoring and reservoir conditions into consideration.Technically effective,safe and economic monitoring programs can be designed based on the techniques currently available and field experience gained from previous and current demonstration projects.