Evaluation of PT logs provided by CFE within geothermal wells down to ~2 km depth in Acoculco (AC) EGS, and down to ~3 km in Los Humeros (LH) super-hot geothermal system indicated a constant temperature gradient in AC and a close to boiling-point-to-depth temperature pattern in LH.
In AC, 1-D S-wave elastic moduli, calculated from ambient seismic noise analysis and gravity, are related to measured temperature with a logarithmic function. This relationship seems also valid at elevations below well bottom, down to the point where a local maximum elastic modulus is observed, as indicated when comparing S-wave modulus with temperature extrapolated by the reservoir computer model of the field.
In LH, seismic velocities and elastic moduli, derived from seismic noise, legacy active seismic CFE survey, recorded seismicity and gravity, are correlated to temperature in the vertical direction by exponential functions, while no correlation is evident in the horizontal one. This implies an indirect relation between seismic velocities and elastic moduli with temperature, e.g. by their dependence on common independent variables such as rock matrix and/or pore pressure and fluid saturation.
