What is the significance of using noble gases (e.g., Helium, Argon) as natural tracers in geothermal reservoir studies?

Noble gases, such as helium and argon, are valuable as natural tracers in geothermal reservoir studies due to their unique properties. They are chemically inert, meaning they do not react with other substances in the reservoir, and they are present in geothermal fluids in trace amounts. This makes them ideal tracers for studying fluid flow paths and residence times without altering the reservoir's chemical equilibrium. The significance lies in several key areas. First, noble gases have distinct isotopic signatures that can be used to identify the origin of the geothermal fluids. For example, the ratio of....