The exploration of fluids trajectories and their patterns of distribution requires extremely stable markers, even in harsh conditions (of pressure, temperature, salinity), and that would be detectable at a very small concentration. Searching for new oil resources also needs to efficiently exploit the fields; the development of auscultation methods is a way to optimize the current exploitation and determine resource mapping. Radioisotopes-enriched markers are mainly used in such operations, which raises environmental issues.

Fluorescent diamonds colloidal dispersions in different composition liquids can be used to trace fluids, for example for exploration of groundwaters or auscultation of oil fields.

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