Details

Autor(en) / Beteiligte

• Agemar, Thorsten

Titel

Bottom hole temperature correction based on empirical correlation

Ist Teil von

• Geothermics, 2022-02, Vol.99, p.102296, Article 102296

Ort / Verlag

Oxford: Elsevier Ltd

Erscheinungsjahr

2022

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• •New bottom hole temperature correction method based on cylinder source model for single shut-in time at each depth.•This study proves that the new method gives better results than the previously used method.•2156 improved bottom hole temperature data sets for Germany archived in geophysics information system FIS-GP at the leibniz institute for applied geophysics. Subsurface temperature is a key parameter for any geothermal exploration activity. In Germany, records of subsurface temperatures exist for approximately 11,000 wells. It is well known that the uncertainty of corrected BHTs is generally high on the order of ± 8 K. It might be even higher in the case of incomplete data sets. In this study, new correction methods based on statistical analyses were developed to improve the correction of BHTs if only one measurement is available. A comparison with high quality temperature records reveals a substantial improvement compared to the previously applied correction method. Since the corrected temperatures are used for the calculation of a geostatistical 3D temperature model and for geothermal project planning, the assessment of uncertainty is very important. High quality data must be preferred over low quality data but low quality data might be better than remote or no data. Knowledge about the degree of certainty of specific data categories may help to improve subsurface temperature predictions for future geothermal projects.