- Description: This chart has a twofold purpose. First, a geothermal gradient can be assumed by entering the depth and a recorded temperature at that depth. Second, for an assumed geothermal gradient, if the temperature is known at one depth in the well, the temperature at another depth in the well can be determined. Depth is on the y-axis and has the shallowest at the top and the deepest at the bottom. Both feet and meters are used, on the left and right axes, respectively. Temperature is plotted on the x-axis, with Fahrenheit on the bottom and Celsius on the top of the chart. The annual mean surface temperature is also presented in Fahrenheit and Celsius.
- Source: © Log Interpretation Chartbook (2009), Schlumberger
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