Final Heat Flow Deliverables for Supplemental Drilling Project
John Welhan, Idaho Geological Survey
Final Report, prepared for
NGDS Supplemental Drilling Project
(DOE Project ID-EE0002850)
April 30, 2014
This report is organized around two documents and a number of hyperlinked data files that comprise
the final deliverables under Idaho’s supplemental contract to the Arizona Geological Survey. The reports
and analysis files can be accessed individually in the \Files subfolder or via the annotated and
hyperlinked Contents list, below.
Report Contents
A. Well Drilling Report – a report describing the thermal gradient holes (construction and abandonment
details), including summaries of local geologic settings, borehole lithologies, thermal conductivity and
temperature logging data.
B. Heat Flow Calculation Report – discussion and analysis of the thermal conductivity, temperature
logging and lithologic data collected from, and a description of the procedures used to calculate heat
flow in, the thermal gradient holes that were completed as part of this study.
Data and Analysis Files
1. Lithology logs – detailed lithologic logs in spreadsheet form, including information from drilling notes
and well completion / construction details.
2a. Final TC measurements – final report from University of Utah’s Geothermal Studies Laboratory
describing the thermal conductivity measurements, precision and results.
2b. All measured TC data – thermal conductivity data in spreadsheet form, as measured by the
University of Utah’s Geothermal Studies Laboratory.
3. Final Temperature Logs – data in spreadsheet form collected during thermal logging of the
temperature gradient holes by the Utah Geological Survey (M. Gwynn, written comm., 2013) on July1-2,
2013.
4. Final Heat Flow Calculation – analysis of the raw thermal conductivity data in the context of lithologic
variations and best two-point conductive thermal gradient intervals.
5. NGDS heatflow_template – NGDS heat flow template with heat flow data from the thermal gradient
holes as well as 31 additional heat flow estimates derived from corrected BHTs in 12 oil and gas
exploration wells drilled in the western Idaho thrust belt, as described in Welhan and Gwynn (2014).
References
Welhan, J. and M. Gwynn, 2014, High heat flow in the Idaho Thrust Belt: A hot sedimentary geothermal
prospect; GRC Trans., in review.