Specific type of Cross-well Surveillance based on injecting the chemical tracers in one well and picking up the arrived tracers into the offset well.
There are two types of chemicals used in Cross-well Surveillance: radioactive and chemical markers.
In case of radioactive tracers the registration of the arrival is based on the downhole GR logging.
In case of chemical markers the registration of the arrival is based on the production sampling at surface.
See Also
Petroleum Industry / Upstream / Data Acquisition / Well & Reservoir Surveillance / Cross-well Surveillance