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 eight wells was separated in two to four sections, in which resistivity and acoustic borehole image logs were deployed. Additionally, all those sections have been cored; the borehole images are essential to orient the cores correctly. 

The task was to deliver quick-look analyses within 12 hours are receival of raw data. This included QC and processing of the image data. To ensure high quality of analysis all interpretations were performed manually. The finalization of interpretation and delivery of results within the given time frame was crucial to avoid costly non-productive times and to allow the determination of intervals for well test like MHF. Also, after the well test another borehole image was acquired to assess the test results and to compare pre- and post-test images. 

The delivered data are also a good foundation for later, detailed interpretations on the images. 

Bastian Roters

Senior Geologist
+13 years experience
responsible for Sedimentological Studies
and Project Management

roters@nimbuc.com

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Learn more about our project management the design of our rush job for our client in this workshop publication.