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Tracer Penetration into Welded Tuff Matrix from Flowing Fractures

1 Cyclotron Road, MS 90-1116, Earth Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720

View larger version (22K): [in a new window]   Fig. 1. Schematic of Niche 3650 end view (modified from Wang et al., 1999).

View larger version (111K): [in a new window]   Fig. 2. Vertical view of the wall face showing the sampling location of rock (sample: Niche 4788) during niche excavation and example of drill-sampled fracture rock.

View larger version (14K): [in a new window]   Fig. 3. Penetration profile of Sulpho Rhodamine B into the rock matrix from the fracture surface. Data shown are the measurement of three splits of the rock powder sample drilled at an interval.

View larger version (23K): [in a new window]   Fig. 4. Penetration profile of FD&C Blue No. 1, plotted as Cv and Cv/C0, into the rock matrix from the fracture surface.

View larger version (28K): [in a new window]   Fig. 5. Comparison of measured tracer concentrations from opposite drilling directions for Core D with Si of 12.5%.

View larger version (28K): [in a new window]   Fig. 6. Comparison of measured tracer concentrations from opposite drilling directions for Core H with Si of 75.8%.

View larger version (31K): [in a new window]   Fig. 7. Comparison of concentration profiles for the tracers: (a) Core D at the experimental duration of 19.5 h; (b) Core H at the experimental duration of 17.9 h.

View larger version (29K): [in a new window]   Fig. 8. Tracer penetration profile into the rock core matrix, plotted as Cv and Cv/C0.

View larger version (25K): [in a new window]   Fig. 9. Tracer penetration profile (plotted as the normalized concentration) into the rock core matrix: (a) Core J at the experimental duration of 16.1 h; (b) Core F at the experimental duration of 16.6 h.