In view of the fact that the leakage of small holes in the buried CO2 pipeline is not easy to be detected, which leads to the problem of inability to accurately trace the source of the pipeline repair in the later stage. This paper designs and establishes a buried CO2 pipeline leak simulation experiment system and conducts experiments on small-hole leaks in buried CO2 pipelines to investigate the changes in soil temperature around the CO2 pipeline leaks. The results showed that the type of

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... ent of CO2 in porous media after it is released from the leak is "funneling". At a distance of about 50 mm from the horizontal, the temperature difference in the horizontal surface is smallest at the 50 cm closest to the vertical distance of the leak, while at a distance of 225 mm from the horizontal, the temperature difference in the horizontal surface is largest at the 70 cm farthest from the vertical distance of the leak. The research results can provide a theoretical basis for the later development of technologies that can quickly locate the leakage points of buried CO2 pipelines and accurately determine their leakage status.