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• W2079273763 abstract "[1] An array of boreholes, drilled through a regionally continuous hydrologically confining layer of sediments into extrusive igneous basement rocks of the Juan de Fuca Ridge eastern flank, has been instrumented with CORK hydrologic observatories for long-term monitoring and fluid sampling. Omission of seals between nested casing strings reaching into basement at one site created a low-resistance connection between basement and the overlying water column, and despite the natural superhydrostatic state of basement water at that location, a “runaway” condition of cold seawater downhole flow into the crust was established, which persisted for more than 4 years. The existence of this condition, along with perturbations generated by it and by initial drilling operations observed at a properly sealed hole 2.4 km away, have been used with analytic and finite element model solutions to constrain formation permeability. The minimum threshold permeability allowing stable downhole flow is roughly 4 × 10−13 m2. A value of permeability similar to this (3–4 × 10−13 m2) is estimated on the basis of the elapsed time for initial perturbations to propagate between the sites (∼2.5 days). The amplitude of the long-term flow perturbation observed at the sealed site (roughly 1.7 kPa) is smaller than that predicted by modeling (5–10 kPa). Models for flow in an anisotropically permeable layer show that this could be the consequence of low vertical permeability (e.g., arising from massive volcanic or sediment interlayering) or high permeability in the direction of the tectonic fabric generated at the ridge axis. Disagreement between the permeabilities estimated here with previous large-scale estimates appropriate for the cross-strike direction (the primary direction between the borehole sites) (10−10–10−9 m2) is difficult to reconcile; it is possible that the holes are poorly connected to zones of high permeability that facilitate the large lateral fluid and heat fluxes previously inferred at this young crustal site." @default.
• W2079273763 created "2016-06-24" @default.
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• W2079273763 date "2010-07-14" @default.
• W2079273763 modified "2023-09-30" @default.
• W2079273763 title "Thermally stimulated “runaway” downhole flow in a superhydrostatic ocean crustal borehole: Observations, simulations, and inferences regarding crustal permeability" @default.
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• W2079273763 doi "https://doi.org/10.1029/2009jb006986" @default.
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