Methods employing distributed temperature sensing and distributed acoustic sensing for geothermal well planning and development

A method for geothermal well planning and development, comprising:

• drilling a plurality of shallow wells;
• for each given shallow well of the plurality of shallow wells, installing fiber optic cables that extends within the given shallow well, wherein the fiber optic cables supports both Distributed Temperature Sensing (DTS) measurements and Distributed Acoustic Sensing (DAS) measurements;
• connecting DTS interrogators to the fiber optic cables that extend within the plurality of shallow wells, and configuring the DTS interrogators to measure temperature profiles in the plurality of shallow wells over time;
• determining location of a geothermal reservoir and planned location of at least one geothermal well that accesses the geothermal reservoir from at least the measured temperature profiles in the plurality of shallow wells over time;
• selecting at least one shallow well of the plurality of shallow wells to be used for DAS measurements;
• at each selected shallow well, disconnecting the DTS interrogator from the fiber optic cables at the selected shallow well and connecting a DAS interrogator to the fiber optic cables at the selected shallow well, and
• at each selected shallow well, configuring the DAS interrogator at the selected shallow well to measure an acoustic profile in the selected shallow well over time.