Subsurface fluid detection

A method of detecting subsurface water or conditions conducive to subsurface water, comprising:

• obtaining a gamma radiation count from multiple surface locations over a subsurface region of interest using a gamma radiation detector having an inorganic scintillation detector selected from a cesium halide crystal, cerium halide crystal, lanthanum halide crystal, or bismuth germinate crystal;
• determining a background gamma radiation count over at least a portion of the subsurface region of interest;
• and
• identifying a potential subsurface water location within the region of interest where a reduced gamma radiation count is present relative to the background gamma radiation count, and wherein the reduced gamma count is:
• from about 5% to 100% less than the background gamma radiation count, from about 20 counts per second to about 500 counts per second, wherein the reduced gamma radiation count is from 5 counts per second to 75 counts per second lower than background gamma radiation count, or both.

A system of detecting subsurface conditions conducive to fluid transfer, comprising:

• a microseismic resonance detector with a resonance sensor to obtain microseismic resonance signals from multiple surface locations over a subsurface region of interest;
• an analog amplifier to amplify the microseismic resonance signals and a low pass filter to filter out high frequency microseismic resonance signal to generate amplified and filtered microseismic signal;
• a processor;
• and
• a memory storing instructions that, when executed by the processor, generates signal stacks from multiple measurements taken at single locations of the multiple surface locations.