请问gem是等温模型吗？在用gem模拟注CO2时，能不能模拟不同温度的CO2对生产的影响？

GEM不是等温模型，可以进行温度计算。流体部分定义*THERMAL *ON，井和动态数据部分定义*INJ-TEMP 注入流体温度。
GEM模拟注CO2时，能模拟不同温度的CO2对生产的影响。

具体可参考算例
GMGHG022.DAT: CO2 Sequestration With Geochemistry and Thermal
This template data set is constructed to model gas sequestration into an aquifer. CO2 injection is done for first 25 years. The injector is shutin thereafter and the fate of CO2 is modelled for next 225 years. Chemical equilibrium constants are functions of temperature. Trace gas is used. Molecular diffusion of CO2 in water is modelled. Thermal effects due to injection of CO2 at 50 C are modelled.

地层冷伤害可参考案例：

意大利埃尼公司二氧化碳捕集与封存研究的热-流-固-化耦合经验