![]() Onsite rig drilling for a geothermal ground source heat pump heating/cooling system in Fort Collins, Colorado. We therefore call the contour map of geothermal gradients an interpretive geothermal gradient map. Any attempt to draw contours between geothermal gradient measurements is an interpretation. ![]() Inevitably there are insufficient measurements to characterize all variations and details in a temperature and geothermal gradient. Temperatures must vary smoothly, however, so there is an expectation that geothermal gradients will vary smoothly between measurements. ![]() Geothermal gradient measurements are made at specific locations within a well. The result is most commonly expressed in units of degrees Celsius per kilometer (☌/km) or degrees Fahrenheit per 100 feet (☏/100 ft): 10☌/km = 0.55☏/100 ft. The gradient is then calculated from difference between the bottom-hole temperature (BHT) and the mean annual surface ground temperature at the well site divided by the depth of the well. Most geothermal gradients are derived from a single temperature measurement at the bottom of a well. The most accurate values are derived from a series of temperature measurements at different depths in a well, but these data are in the minority. The geothermal gradient is the rate of increase of temperature with increasing depth in the Earth’s interior. This is a critical feature on our MS-51 Interpretive Geothermal Gradient Map of Colorad o. One particular metric that is used to generally classify a geothermal energy resource is called the geothermal gradient. The CGS has long been involved in researching the characteristics of geothermal energy across the state, publishing more than 30 reports on various aspects of this important renewable resource. In that regard we thought we would re-introduce some of that research and how it is accomplished.
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