Motivation
Outputs
T_e(t, l) | along-hole geothermal temperature profile |
Inputs
t | Astronomic time | ||
l | wellbore trajectory Measured Depth with reference to Earth's surface ( l=0) | ||
z(l) | wellbore trajectory True Vertical Depth Sub-Sea (TVDss) | ||
j_z | True vertical component of regional Earth's heat flux (usually j_z = 25 \div 55 \ mW/m^2) |
where
T_{srf} | Annual average surface temperature based on weather reports |
T_A | Annual average surface temperature variation based on weather reports |
A_T | Period of annual temperature variation cycle: A_T = 1 \, {\rm year} |
\delta t_A | Time moment of seasonal highest temperature with respect to January 1 |
a_e | Rock thermal diffusivity |
Assumptions
Equations
Below Neutral Temperature Layer | Above Neutral Temperature Layer | ||||
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where
z_s = z(l=0) |
See Also
Geology / Geothermal Temperature Profile
Geothermal Temperature Field @model
References
Kasuda, T., and Archenbach, P.R. "Earth Temperature and Thermal Diffusivity at Selected Stations in the United States", ASHRAE Transactions, Vol. 71, Part 1, 1965.