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The report gives details of the use of a new down-hole temperature recorder combined with appropriate data processing to calculate the geothermal gradient. Two different processes are considered: 1) The recorder operates inside the drilling string immediately after mud circulation has been stopped and after a long drilling phase with constant parameters. The data from the recorder and surface instruments are used in a simplified heat transfer computer model to calculate the average geothermal gradient at that depth. 2) The recorder is run in an open hole two hours after the circulation has been stopped. The data from this can be used with data from a half-hour down-hole reading corresponding to these conditions to determine the static temperature at the measurement depth and thus calculate the average geothermal gradient. Both methods have been tested against 10 measurements made in geothermic wells in the Paris basin, and results correspond to known figures (i.e. 2.7-4 degrees per 100 m).

Additional information

Bibliographic Reference: EUR 9252 FR (1984) MF, 76 P., BFR 120, EUROFFICE, LUXEMBOURG, POB 1003
Availability: Can be ordered online
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