Borehole packer tests at multiple depths resolve distinct hydrologic intervals in 3.5-Ma upper oceanic crust on the eastern flank of Juan de Fuca Ridge
Borehole packer tests at multiple depths resolve distinct hydrologic intervals in 3.5-Ma upper oceanic crust on the eastern flank of Juan de Fuca Ridge
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多个深度的钻孔封隔器测试解决了胡安德富卡海岭东侧 3.5 Ma 上洋地壳的不同水文区间
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发表时间：
2008
期刊：
影响因子：
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通讯作者：
A. Fisher
中科院分区：
文献类型：
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作者：
K. Becker;A. Fisher
[1] 在综合海洋钻探计划 1301B 孔中使用钻柱封隔器进行了单孔水文地质实验，该孔钻入胡安德富卡海岭东侧 3.5 Ma 上层海洋基底 318 m。裸眼进行了 7 次恒速注入试验，封隔器充气至基底段最深 166 m 的 3 个深度。测试间隔中记录的主要压力数据需要对海底压力（主要是潮汐）的局部变化以及个别测试期间“基线”压力的变化进行校正，这可能是由于钻井引起的海底水的井下流动所致。校正后的压力记录符合抽水过程中井眼响应的标准、理想化模型，从而估算出 1301B 孔附近玄武岩地壳上部 318 m 内的基底渗透率约为 1 至 3 × 10−12 m2。 1301B 孔周围的上部 207 m 基底似乎比该深度以下 111 m 的基底更具透射性。上部层段的渗透率可能高达 5 × 10−12 m2，封隔器安装深度之间 30 米厚的区域内渗透率可能高达 2 × 10−11 m2。将结果与 1026B 和 1027C 洞附近最上层基底的封隔器和热数据进行比较表明，该区域上地壳最具透射性的部分可能并不紧邻沉积物-基底过渡区，而是位于该剖面的更深处。
[1] Single-hole hydrogeologic experiments were conducted with a drillstring packer in Integrated Ocean Drilling Program Hole 1301B, which penetrates 318 m into 3.5-Ma upper oceanic basement on the eastern flank of the Juan de Fuca Ridge. Seven constant-rate injection tests were conducted in open hole, with the packer inflated at three depths in the deepest 166 m of the basement section. The primary pressure data recorded in the test intervals required correction for local variations in seafloor pressure (mainly tides), as well as for changes in the “baseline” pressures during individual tests, probably owing to downhole flow of ocean bottom water induced by drilling. The corrected pressure records were fit to standard, idealized models of borehole response during pumping, leading to estimated basement permeabilities within the upper 318 m of basaltic crust near Hole 1301B of the order of 1 to 3 × 10−12 m2. The upper 207 m of basement around Hole 1301B appears to be more transmissive than the 111 m below this depth. Permeability within the upper interval may be as high as 5 × 10−12 m2, and permeability within a 30-m-thick zone between packer setting depths may be as great as 2 × 10−11 m2. Comparison of the results to packer and thermal data from uppermost basement in nearby Holes 1026B and 1027C suggests that the most transmissive part of the upper crust in this area may be located not immediately adjacent to the sediment-basement transition but deeper in the section.
胡安德富卡海岭东侧年轻（3·5 Ma）洋壳的物理特性：电缆和岩心测量与全球数据的比较
影响因子：
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作者：
Bartetzko;A. T. Fisher
通讯作者：
A. T. Fisher