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doi:10.2204/iodp.proc.322.208.2013 SummaryWe used CRS consolidation experiments and flow-through permeability experiments to determine permeability of samples from Sites C0011 and C0012. At Site C0012 (115.44–255.31 mbsf), CRS-based estimates of in situ kv range from 1.12 × 10–17 to 2.54 × 10–18 m2 and estimates of in situ kh range from 1.66 × 10–17 to 6.55 × 10–18 m2. A log-linear best fit to the permeability-depth data document a downhole decrease in permeability, with an excellent goodness of fit (R2 = 0.99). From flow-through experiments on samples from Site C0012, in situ kv estimates range from 6.09 × 10–19 to 2.86 × 10–19 m2 and in situ kh is 6.54 × 10–19. A log-linear (permeability-depth) best-fit model does not yield a strong the goodness of fit (R2 = 0.46). Permeability at Site C0012 shows a step-decrease in permeability from 255.23 to 273.51 mbsf, which corresponds to a change from CRS to flow-through experiments and to a change in sample stiffness. At Site C0011, in situ kv estimates from flow-through experiments range from 7.03 × 10–17 to 1.38 × 10–18 m2. Neglecting one anomalous data point, permeability estimates document a general decrease with increasing depth; however, the log-linear (permeability-depth) best-fit model has a low goodness of fit (R2 = 0.31). Comparison of flow-through permeability estimates at Sites C0011 and C0012 documents that permeability at equivalent depths below 350 mbsf at Site C0011 is greater than at Site C0012. In lithologic Units III and IV, flow-through estimated permeability at Site C0011 is greater than at Site C0012. Porosity data determined shipboard and in the laboratory are consistent and are likely influenced by sample disturbance. Trimming intact laboratory samples was difficult because of cracks and other visible coring disturbance. Based on noted and inferred disturbance, all permeability estimates should be viewed with caution as upper limit estimates of in situ permeability. |
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