An imaginary Geothermal Temperature Profile (TG) free from the impact from surface temperature variations.
The only measurable difference with Geothermal Temperature Profile (TG) is above Neutral Temperature Layer.
See Also
Geology / Geothermal Temperature Field
[ Geothermal Temperature Profile (TG) ]
[ Petroleum Geology ][ Geological Model (GM) ] [ Neutral Temperature Layer (NTL) ]