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首页> 外文期刊>Zeitschrift fur Angewandte Geologie >Anhydrite Cement in Rhaetian Sandstones in Hamburg: X-ray and NMR Tomographic Studies and Leaching Tests
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Anhydrite Cement in Rhaetian Sandstones in Hamburg: X-ray and NMR Tomographic Studies and Leaching Tests

机译：汉堡Rhatian砂岩中的硬石膏水泥：X射线和NMR层析成像研究及浸出试验

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摘要

The Rhaetic sandstone was penetrated by the borehole in Hamburg-Allermoehe drilled to investigate the potential for geothermal energy at that location. This sandstone is cemented with anhydrite and therefore the potential for extraction of geothermal energy is limited. Study of the cementation is important, however, in order to obtain information about the regional distribution of the cementation and about possibilities to stimulate the cemented sandstone horizons. Radiographic as well as x-ray and NMR tomographic methods were developed to study this anhydrite cementation. These methods can be used to nondestructively distinguish individual layers, "islands" of cementation, and interbedding cementation patterns. They permit three-dimensional representation so that changes can be observed as a function of depth. Leaching tests in the laboratory with various fluids sometimes increased the permeability by three orders of magnitude and new flow paths were formed.
机译：Rhaetic砂岩被汉堡-Allermoehe的钻孔所穿透，以研究该位置的地热能潜力。该砂岩用硬石膏胶结，因此提取地热能的潜力受到限制。然而，对胶结作用的研究很重要，以便获得有关胶结作用的区域分布以及激发胶结砂岩层位的可能性的信息。开发了射线照相以及X射线和NMR层析成像方法来研究这种硬石膏的胶结作用。这些方法可用于非破坏性地区分各个层，胶结“岛”和层间胶结模式。它们允许三维表示，因此可以观察到深度的变化。在实验室中使用各种流体进行浸出测试有时会将渗透率提高了三个数量级，并形成了新的流动路径。

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