基于TOUGH2模拟CO2地质封存对地层温度的影响

摘要

The three-dimensional model is established with the numerical simulation software TOUGH2 of flow and heat migration, through a constant speed with long time of injecting fluids containing CO2 to simulate CO2 geological storage research on the effect of formation temperature.The results show that the formation temperature is in equilibrium before CO2 geological storage and the original balance is broken after sealing up.The higher the formation permeability is, the more conducive to the exchange of temperature.The temperature of whole formation undergoes the process from unsteady state to steady state, and because the exchange of formation temperature is restricted by the energy conservation, the final temperature of the whole formation is about at the initial time and the middle temperature of the lower formation temperature.The injected fluid continuously has a limited influence on the formation temperature, and the formation temperature changes rapidly in the early, the late change rate gradually slows down.%运用水流及热量运移的数值模拟软件TOUGH2建立三维模型,通过长时间恒速地注入含CO2的流体,模拟研究CO2地质封存对地层温度的影响.结果表明,CO2地质封存之前地层温度处于平衡状态,封存之后打破原有平衡;地层渗透率越高,越利于温度的交流;整个地层温度经历从非稳态到稳态的过程,温度的交换由于受到能量守恒的制约,整个地层的最后温度约处于初始时刻上、下地层温度的中间值;不断注入的流体对整个地层温度的影响有限,地层温度早期变化速度较快,后期变化速度逐渐减缓.