Multi-well Borehole Image Analysis for Nagra, Switzerland
The National Cooperative for the Disposal of Radioactive Waste (Nagra) has embarked on a multi-well, multiyear scientific data-gathering program to compare three sites for a radioactive waste disposal. The three sites are located in northeastern Switzerland and are 20km to 40km apart from each other.
The goal of this study was to preform data processing and quality control of borehole image log data and to perform a quick look analysis of structural environment and present-day stress field. Each of the nine wells was separated in several sections, in which resistivity and acoustic borehole image logs were deployed. Most sections have been cored; the borehole images are essential to orient the cores correctly.
Project facts
- 9 Boreholes were drilled during the campaign
- Each of them with 2 to 4 sections
- Almost 80 borehole image log runs
- More than 20 kilometers of borehole images
- Resistivity and Acoustic images acquired
- 6 3/8" and 8 1/2" diameter sections were logged and interpreted
- Pre- and post-stimulation logging and comparison of analysis results
- Most of the logged intervals also had core for comparison
The delivered data are also a good foundation for later, detailed interpretations on the images.
