Work Report NAB 21-22

TBO Bözberg-​2-1:Data Report

Arbeitsbericht NAB 21-22 TBO Bözberg-​2-1:Data Report To provide input for site selection and the safety case for deep geological repositories for radioactive waste, Nagra has drilled a series of deep boreholes in Northern Switzerland. The aim of the drilling campaign is to characterise the deep underground of the three remaining siting regions. The Bözberg-​2-1 exploratory borehole is the fourth borehole drilled within the framework of this project. The drill site is located in the southern part of the Jura Ost siting region.   Dossier I: In this report, first results from the Bözberg-​2-1 borehole are presented, in particular from the drilling operations and including the drill site construction. Dossier II: In this report, first results from the Bözberg-​2-1 borehole are presented, in particular the photo documentation of the cuttings and core samples as well as the resinated core slabs. Dossier III: In this report, first results from the Bözberg-​2-1 borehole are presented, in particular a detailed description of all encountered lithologies and lithostratigraphic units. Dossier IV: In this report, first results from the Bözberg-​2-1 borehole are presented, in particular the data from detailed microfacies analyses as well as ammonite-​ and palynostratigraphy, complementing the lithostratigraphic report (Dossier III). Dossier V: In this report, first results from the Bözberg-​2-1 borehole are presented, in particular from the detailed core goniometry and the characterisation of the tectonic structures observed in the drill cores. Dossier VI: In this report, first results from the Bözberg-​2-1 borehole are presented, in particular from the wireline measurements (wireline logging, micro-​hydraulic fracturing and pressure-​meter testing). Dossier VII: In this report, first results from the Bözberg-​2-1 borehole are presented, in particular from the hydrogeological investigations such as hydraulic packer testing. Dossier VIII: In this report, first results from the Bözberg-​2-1 borehole are presented, in particular the data from detailed laboratory analyses on core material for petrophysical and geochemical rock and porewater characterisation. Dossier IX: In this report, first results from the Bözberg-​2-1 borehole are presented, in particular from geomechanical laboratory testing on core material, such as triaxial and oedometric testing. Dossier X: In this report, first results from the Bözberg-​2-1 borehole are presented, in particular from the stochastic petrophysical log analysis combining selected wireline and Multi-​Sensor Core Logger as well as laboratory measurements. Summary Plot: In this report, the results from the Bözberg-​2-1 borehole are summarised in the form of a composite plot, including a short technical explanation of the information displayed.