Carbon dioxide plume geothermal system (CPGS) can be used to exploit geothermal energy and realize carbon dioxide geological sequestration simultaneously. The thermal compensation from the rock formation around the geothermal reservoir is one of the important factors that affect the performance of CPGS. Based on a three dimensional base and cap rocks enclosed heat reservoir model

the influences of the thermal compensation on the temperature evolutionary process of the rock and fluid in the geothermal reservoir and the heat collection performance of CPGS were studied. The distribution of geothermal reservoir temperature and the temperature of production fluid were compared with that without consideration of the thermal compensation. The results show that the thermal compensation reduces both the production fluid temperature variation along the vertical direction and its temperature decreasing rate in the later period of system operation

therefore extends the lifetime of CPGS and gains better heat collection performance. With consideration of the thermal compensation

the heat production is improved significantly. The results also show that the thermal compensation of the base rocks is stronger than that of the cap rocks.