Wirelessly powered and activated electromagnetic transmitters behind casing for reservoir monitoring

A method comprising:

• transmitting a first signal to a ground formation by a transmitting element, wherein the transmitting element is disposed along an outer surface of a wellbore casing;
• receiving, by a receiving element, energy from the from the first signal transmitted into the ground formation by the transmitting element, wherein the received energy is converted into a second signal that is provided to a computer such that the computer can perform an evaluation on the second signal to identify a property of the ground formation;
• transmitting energy via a first contactless communication element located inside of the wellbore casing;
• and
• receiving the transmitted energy by a second contactless communication element located on the outer surface of the wellbore casing.

A non-transitory computer-readable storage media having embodied thereon instructions that when executed by one or more processors result in:

• a trigger signal being sent to a first set of components disposed inside of a wellbore casing;
• the trigger signal being wirelessly transmitted through the wellbore casing by a first contactless communication element of the first set of components;
• electromagnetic (EM) energy being transmitted into a ground formation by a second set of components disposed along an outer surface of a wellbore casing, the EM energy transmitted based on the trigger signal being received by a second contact communication element of the second set of components;
• a portion of the transmitted EM energy being received by a third set of components based on the EM energy being transmitted into the ground formation;
• the portion of the EM energy received by the third set of components being converted into a data stream by the third set of components;
• and
• an evaluation being performed on the data stream to identify a property of the ground formation.