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Is the permeability of crystalline rock in the shallow crust related to depth, lithology or tectonic setting?

机译:浅层地壳中晶体岩石的渗透率与深度,岩性或构造环境有关吗?

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摘要

The permeability of crystalline rocks is generally assumed to decrease with depth due to increasing overburden stress. While experiments have confirmed the dependence of permeability on stress, field measurements of crystalline permeability have not previously yielded an unambiguous and universal relation between permeability and depth in the shallow crust (<2.5km). Large data sets from Sweden, Germany and Switzerland provide new opportunities to characterize the permeability of crystalline rocks in the shallow crust. Here we compile in situ permeability measurements (n=973) and quantitatively test potential relationships between permeability, depth (0-2.5km), lithology (intrusive and metamorphic) and tectonic setting (active and inactive). Higher permeabilities are more common at shallow depths (<1km), but trend analysis does not support a consistently applicable and generalizable relationship between permeability and depth in crystalline rock in the shallow crust. Results suggest lithology has a weak control on permeability-depth relations in the near surface (<0.1km), regardless of tectonic setting, but may be a more important control at depth. Tectonic setting appears to be a stronger control on permeability-depth relations in the near surface. Permeability values in the tectonically active Molasse basin are scattered with a very weak relationship between permeability and depth. While results indicate that there is no consistently applicable relationship between permeability and depth for crystalline rock in the shallow crust, some specific lithologies and tectonic settings display a statistically significant decrease of permeability with depth, with greater predictive power than a generalized relationship, that could be useful for hydrologic and earth system models.
机译:一般认为,由于上覆应力的增加,结晶岩的渗透性随深度而降低。尽管实验已经证实了渗透率对应力的依赖性,但晶体渗透率的现场测量以前并未在浅层地壳(<2.5 km)中渗透率与深度之间产生明确且普遍的关系。来自瑞典,德国和瑞士的大量数据集为表征浅层地壳中结晶岩石的渗透性提供了新的机会。在这里,我们汇编了原位渗透率测量值(n = 973),并定量测试了渗透率,深度(0-2.5km),岩性(侵入性和变质性)和构造背景(活动和非活动)之间的潜在关系。较高的渗透率在浅层深度(<1 km)中更为常见,但趋势分析不支持浅层结壳中的结晶岩渗透率和深度之间的一致适用且可推广的关系。结果表明,无论构造背景如何,岩性对近地表(<0.1km)渗透率-深度关系的控制均较弱,但在深度控制方面可能更为重要。构造背景似乎是对近地表渗透率-深度关系的更强控制。构造活跃的莫拉西盆地的渗透率值分散,渗透率和深度之间的关系非常弱。虽然结果表明在浅层地壳中,岩石的渗透率和深度之间没有始终适用的关系,但某些特定岩性和构造背景显示出渗透率随深度的变化具有统计学显着性,比一般关系具有更大的预测力,这可能是对水文和地球系统模型有用。

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