The chemical tracer, especially the perfluorocarbon tracer and sulphur hexafluoride, has been used much more popularly than the radioactive tracer nowadays.

• 化学示踪剂已取代放射性示踪剂在混相驱中的主导地位，其中，全氟环烷烃和六氟化硫是目前现场广泛试验和应用的化学气体示踪剂。