Detecting and locating fluid flow in subterranean rock formations

A method, comprising:

• placing a plurality of sensors into a subsurface underneath of at least one surface facility at a respective plurality of subsurface positions in the subsurface;
• performing, by the at least one surface facility, an initial fracture stimulation treatment, comprising:
• i) injecting, by the at least one surface facility, at least one fluid, through one or more wellbores, at one or more subsurface positions associated with a reservoir of hydrocarbons;
• ii) acquiring, by a processor, for a duration of at least 10 minutes, a plurality of seismic traces from the plurality of sensors located in the subsurface to form seismic data;
• wherein the plurality of seismic traces has respective amplitudes that are lower than amplitudes of seismic waves caused by a microseismic event;
• iii) computing, by the processor, from the seismic data, seismic wave travel times between the one or more subsurface positions within the subsurface and a subset of the plurality of sensors located at a respective plurality of sensor subsurface positions in the subsurface;
• iv) computing, by the processor, from the computed seismic wave travel times, seismic wave travel time differences between the subset of the plurality of sensors located at the respective plurality of sensor subsurface positions in the subsurface and the one or more subsurface positions;
• v) determining, by the processor, seismic data similarity coefficients associated with the one or more subsurface positions based at least in part on the computed seismic wave travel time differences;
• vi) determining, by the processor, based at least in part on the determined seismic data similarity coefficients, a fluid flow seismic signal value associated with the one or more subsurface positions;
• wherein the fluid flow seismic signal value is distinct from seismic event data resulting from a tensile failure;
• vii) determining, by the processor, at least one position of a fluid front of the at least one fluid moving through the subsurface based at least in part on the fluid flow seismic signal value associated with the one or more subsurface positions;
• and performing, by the at least one surface facility, based at least in part on the at least one position of the fluid front of the at least one fluid moving through the subsurface, one or more remedial activities to drain one or more parts of the reservoir of hydrocarbons that are not fractured by the initial fracture stimulation treatment, wherein the one or more remedial activities comprise i) drilling one or more additional wellbores at one or more additional subsurface positions associated with the one or more parts of the reservoir of hydrocarbons and ii) performing one or more subsequent fracture stimulation treatments, wherein the at least one or more remedial activities further comprise:
• i) adjusting a fluid saturation of the at least one fluid, and ii) adjusting a pressure under which the at least one fluid is injected.