This document discusses collaboration between Lawrence Berkeley National Laboratory and Uppsala University on the Swedish Deep Drilling Project (COSC). The COSC project aims to drill two deep boreholes (COSC-1 and COSC-2) to study geological structures and characterize basement rocks and hydrology. COSC-1 will drill through the Seve Nappe to study channel flow, reaching a depth of 2.5 km with 100% core recovery. Funded activities for COSC-1 include logging the borehole to detect flowing fractures, modeling fluid flow, analyzing microbial communities in fractures, characterizing water compositions, and studying fractured core samples.

1. Spent Fuel and Waste Science and Technology
Collaboration with Swedish Deep
Drilling Project
Patrick Dobson & Chin-Fu Tsang
Lawrence Berkeley National Laboratory
Uppsala University
SFWST Working Group Meeting
May 24, 2017

2. Spent Fuel and
Waste Science and
Technology
COSC-1 – Study of Seve Nappe
COSC-1
BASEMENT
Collisional Orogeny in the Scandinavian Caledonides

3. Spent Fuel and
Waste Science and
Technology
COSC Drilling Goals
 Geological objectives
 Drill through the hot middle allochthon (Seve
Nappe) to study channel flow – COSC-1
 Penetrate the sole thrust (Alum shale) and one or
more basement reflectors – COSC-2
 Complementary studies
 Heat flow and climate
 Large and small scale water circulation patterns,
present and past
 Deep biosphere
 Calibration of geophysical surveys

4. Spent Fuel and
Waste Science and
Technology
Core Drilling – 2.5 km hole
100 % core recovery
HQ to 1616 m
NQ to 2496 m
Detailed logging of core for lithology and rock properties
Core photographs and scans
Density, p-wave velocity, magnetic susceptibility
Primary lithologies – gneiss and amphibolite

5. Spent Fuel and
Waste Science and
Technology
Possible Insights from
COSC Project
Characterization of Basement Rocks
– Geophysical surveys and downhole logging
– Lithologic descriptions of core
– Structural studies (deformation, stress measurements,
fracture orientations)
Hydrologic Characterization
– Flowing fracture identification and modeling
– Fluid chemistry variations with depth
– Microbial community characterization

6. Spent Fuel and
Waste Science and
Technology
DOE-Funded Activities – COSC-1
 Flowing fluid electric conductivity (FFEC) logging of
well to detect flowing fractures – Chin-Fu Tsang
 Modeling of FFEC logging results – Chris Doughty
 Sampling and analysis of microbial communities
associated with fracture zones – Yvette Piceno,
Lauren Tom & Gary Andersen
 Characterization of water compositions – Pat
Dobson, Lasse Ahonen & Riikka Kietäväinen
 Laboratory studies of fractured core samples – Tim
Kneafsey & Sharon Borglin
 Workshop with COSC-1 science team – Chris Juhlin
& team