CO2地质储存过程中的地表变形数值模拟研究

本文以阿尔及利亚Salah场地为例, 利用CGS-THCM耦合模拟程序建立数值模型, 模拟不同方式注入CO2引起地表位移的变化规律, 提出将数值模拟手段与inSAR监测数据结合起来综合评估CO2地质封存工程中的CO2逃逸问题, 并建立了CO2逃逸-地表位移评估体系, 评估CGS工程中被封存的CO2是否逃逸以及逃逸量的大小。通过模拟结果可以看出:工程初期引起地表位移较小, 随着时间的增加, 引起的地表位移越来越明显, 而且注入量大、注入压力大都会引起相对较大的地表位移。

NUMERICAL MODELING OF GROUND SURFACE DEFORMATION IN THE PROCESS OF CO2GEOLOGICAL STORAGE

Take in Salah field in Algeria for example, numerical model has been established with the use of CGS-THCM coupled simulation program to simulate the changes of surface displacement caused by injected CO2 in different way. A method of combining Numerical simulation with monitoring data has been put forward to make comprehensive assessment of the CO2 escape problems during CO2 geological storage project. And the CO2 escape-surface displacement evaluation system has been established to assess whether CO2 escape and quantity size of the escaped CO2 during the CGS project. It is can be seen through simulation results: by the initial phase, smaller surface displacement be caused. And as time increased the surface displacement is more and more obvious. In addition, injection volume, injection pressure correspondingly cause large surface displacements.