Method to measure injector inflow profiles

A system usable with a wellbore, comprising:

• an injection system to inject and to stop injection of fluid into a formation, the formation intersected by a wellbore having an uphole section uphole of the formation and a formation section within the formation;
• an observation system to observe temperature at least partially along the uphole section of the wellbore and at least partially along the formation section of the wellbore,
• wherein, after injection of fluid is stopped, the injection system re-starts injection of fluid into the formation,
• wherein the observation system observes a temperature profile of the fluid in the wellbore,
• wherein the observation system identifies a temperature characteristic between two points on the temperature profile, and
• wherein, while the injection of fluid is occurring, the observation system observes movement of the temperature characteristic as it moves from the uphole section and across the formation section of the wellbore;
• and
• a processing system to determine an inflow profile of the formation based on the movement of the temperature characteristic within the wellbore.