Thermal measuring and testing – Temperature measurement – Geophysical
Patent
1993-06-03
1994-09-13
Gutierrez, Diego F. F.
Thermal measuring and testing
Temperature measurement
Geophysical
374137, 374166, 324715, G01K 300, G01K 716, G01K 1300
Patent
active
053463072
ABSTRACT:
A method is provided for measuring subsurface soil or rock temperatures remotely using electrical resistivity tomography (ERT). Electrical resistivity measurements are made using electrodes implanted in boreholes driven into the soil and/or at the ground surface. The measurements are repeated as some process changes the temperatures of the soil mass/rock mass. Tomographs of electrical resistivity are calculated based on the measurements using Poisson's equation. Changes in the soil/rock resistivity can be related to changes in soil/rock temperatures when: (1) the electrical conductivity of the fluid trapped in the soil's pore space is low, (2) the soil/rock has a high cation exchange capacity and (3) the temperature changes are sufficiently high. When these three conditions exist the resistivity changes observed in the ERT tomographs can be directly attributed to changes in soil/rock temperatures. This method provides a way of mapping temperature changes in subsurface soils remotely. Distances over which the ERT method can be used to monitor changes in soil temperature range from tens to hundreds of meters from the electrode locations.
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Chesnut Dwayne A.
Daily William D.
Ramirez Abelardo L.
Gutierrez Diego F. F.
Regents of the University of California
Sartorio Henry P.
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