The temperature beneath the surface increases as the depth increases. The data used to calculate the subsurface temperature includes geothermal gradient, depth, and the surface temperature data from the well being evaluated. The formula used to calculate the subsurface temperature is as follows:
Td = Ts + (Gg × d)
- Td = Temperature at a specific depth
- Ts = Surface temperature
- Gg = Geothermal gradient
- d = Depth
However, if the geothermal gradient data is not available, linear regression can be applied to obtain the geothermal gradient value from the temperature and depth data.
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| Geothermal Gradient Example |
Calculate your Geothermal Gradient and Get the Graph!
Enter the surface and bottom hole temperatures, and depths, to calculate the geothermal gradient and see the graph.
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