17. MEASUREMENTS OF THE PERMEABILITY OF THE UPPER OCEANIC CRUST AT HOLE 395A, ODP LEG 109 1
17. MEASUREMENTS OF THE PERMEABILITY OF THE UPPER OCEANIC CRUST AT HOLE 395A, ODP LEG 109 1
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17. ODP 109 段 395A 孔上层洋壳渗透性测量 1
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发表时间：
1990
期刊：
影响因子：
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通讯作者：
K. Becker
中科院分区：
文献类型：
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作者：
K. Becker
利用充气钻柱封隔器测量了395A井73.3m老地壳剖面上覆93m沉积物571m范围内两个带的原地渗透率。井下温度(Becker等人，1984年；Kopietz等人，这个体积)表明，上面200-250米的玄武岩(到海底以下约350米的深度，或MBSF)具有很强的渗透性，约为10_14-10-13平方米。在第78B段，希克曼等人。(1984a)在583-664 Mbsf段测得的渗透率很低，约为10~i8-1(T17平方米)。在第109段，封隔器首先以396Mbsf的速度充气，隔离了396-606Mbsf段，效果良好，然后以516Mbsf的速度隔离了516-606Mbsf段，有些泄漏通过了封隔器，结果很差。在两个深度都进行了标准段塞试验和恒速注入试验。结果表明，396-606Mbsf段的体积渗透率在10~14m2量级。因此，除了希克曼等人测量的非渗透区外。根据Langseth等人(1984a)的研究，395A孔岩心的大部分基底段具有很强的渗透性，将支持朗塞斯等人模拟的活跃的水文地质过程。(1984)。
An inflatable drill-string packer was used to measure the in-situ bulk permeability of two zones within the 571 m of 7.3-m.y.-old crustal section overlain by 93 m of sediment in Hole 395A. Downhole temperatures (Becker et al., 1984; Kopietz et al., this volume) indicate that the upper 200-250 m of basalt (to a depth of about 350 m below seafloor, or mbsf) is quite permeable, about 10_14-10-13 m2. During Leg 78B, Hickman et al. (1984a) measured a very low permeability for the section 583-664 mbsf, about 10~I8-1(T17 m2. During Leg 109, the packer was inflated first at 396 mbsf, isolating the section 396-606 mbsf with good results, and then at 516 mbsf, isolating the section 516-606 mbsf with some leakage past the packer and poor results. At both depths, standard slug tests and constant-rate injection tests were conducted. The results indicate that the bulk permeability of the section 396-606 mbsf is on the order of 10~ 14 m2. Thus, with the exception of the impermeable zone measured by Hickman et al. (1984a), most of the basement section cored in Hole 395A is quite permeable, and would support active hydrogeological processes such as those modeled by Langseth et al. (1984).