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首页> 外文期刊>Earth and Planetary Science Letters: A Letter Journal Devoted to the Development in Time of the Earth and Planetary System >Tidal pumping of fluids within and from the oceanic crust: new observations and opportunities for sampling the crustal hydrosphere
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Tidal pumping of fluids within and from the oceanic crust: new observations and opportunities for sampling the crustal hydrosphere

机译：大洋壳内外流体的潮汐泵送：对地壳水圈采样的新发现和机会

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Seven boreholes established by the Ocean Drilling Program in sedimented ridge-crest and ridge-flank environments have been sealed to stop the exchange of formation water and seawater via the holes after drilling, and instrumented to allow long-term hydrologic monitoring. Records of seafloor and basement-fluid pressures in these holes document tidal-frequency formation-pressure variations that are attenuated and phase-shifted relative to variations at the seafloor. Spatial variations in the response to seafloor tidal loading create oscillatory pressure gradients which drive fluid flow within the crust, and tidal pressure differentials between the crust and the water column modulate flow through the seafloor. Both may have significant geochemical and biological consequences. The magnitude of the tidal pressure differential observed across sediment sections is in many instances larger than the average differential pressure created by hydrothermal buoyancy forces, and this causes the pressure difference across fluid sampling ports incorporated in the borehole seals to reverse sign periodically. This can create a problem for obtaining undiluted crustal fluid samples at the seafloor from moderately overpressured holes, but it also provides an opportunity for fluids to be pumped passively from moderately underpressured holes through the use of uni-directional values. Potential production rates, estimated using pre- and post-seal thermal, fluid-flow, and pressure data, indicate that significant fluid fluxes can be established, of the order of 10 m~3 (typically one hole-volume) per month.
机译：海洋钻井计划在沉积的山脊波峰和山脊侧面环境中建立了七个钻孔，这些钻孔被密封，以阻止钻井后通过这些孔交换地层水和海水，并进行了仪器监测以进行长期的水文监测。这些孔中海底和基底流体压力的记录记录了潮汐地层压力的变化，这些变化相对于海底的变化而衰减并发生了相移。对海底潮汐负荷的响应中的空间变化会产生振荡压力梯度，从而驱动地壳内的流体流动，地壳与水柱之间的潮汐压差会调节流经海底的流量。两者都可能具有重大的地球化学和生物后果。在许多情况下，在沉积物截面上观察到的潮汐压差的大小大于由水热浮力产生的平均压差，这会导致跨入井眼密封件中的流体采样端口的压差周期性地反转。这可能会带来一个问题，无法从中度过压的孔中获取海底未稀释的地壳流体样品，但也为通过使用单向值从中度过压的孔中被动抽取流体提供了机会。使用密封前后的热，流体流量和压力数据估算的潜在生产率表明，可以建立显着的流体通量，每月约为10 m〜3（通常为一个孔体积）。

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