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- W2185696359 abstract "A drill-string packer was used during Leg 148 to conduct measurements of the bulk permeabilities of three depth intervals in the upper crustal section penetrated by Hole 896A. Located about 1 km southeast of Hole 504B, near a local heat-flow high, Hole 896A is cased through 179 m of sediment and the top 16 m of basement, and then penetrates to 469 mbsf, or 290 m into the upper oceanic crust. The packer was set in casing at 106 mbsf and in open hole at 233 and 385 mbsf, and standard slug and constant-rate injection tests were conducted to assess the transmissivities and bulk permeabilities of the respective intervals 195^69, 223^69, and 385-469 mbsf. The results indicate that the upper 38 m of open hole is quite permeable, on the order of 2 × 10~13 m2. The section below this zone, 223-469 mbsf, is less permeable, on the order of 1-2 × 10~ 14 m2, but certainly permeable enough to support passive off-axis hydrothermal circulation. The permeability structure in Hole 896A is quite consistent with values determined in the upper 200 m of basement in Hole 504B, and supports the inference that the uppermost basement is permeable on a scale of kilometers around the sites. However, the measurements in Hole 896A show no sign of the sharp reduction in permeability previously reported below 250 m into basement in Hole 504B." @default.
- W2185696359 created "2016-06-24" @default.
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- W2185696359 date "1996-05-01" @default.
- W2185696359 modified "2023-09-23" @default.
- W2185696359 title "Permeability Measurements in Hole 896A and Implications for the Lateral Variability of Upper Crustal Permeability at Sites 504 and 896" @default.
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- W2185696359 doi "https://doi.org/10.2973/odp.proc.sr.148.135.1996" @default.
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