Fracture permeability and in situ stress to 7 km depth in the KTB scientific drillhole
Fracture permeability and in situ stress to 7 km depth in the KTB scientific drillhole
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KTB 科学钻孔 7 公里深度的裂缝渗透率和地应力
DOI：
10.1029/1999gl011068
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发表时间：
2000
影响因子：
5.2
通讯作者：
M. Zoback
中科院分区：
文献类型：
--
作者：
Takatoshi Ito;M. Zoback
为了更好地了解控制流体流动和水力传导性在显着的深度在脆性地壳的机制，我们已经研究了德国大陆深钻孔（KTB主孔）通过分析高分辨率的温度剖面裂缝渗透率和原地应力之间的关系。我们的分析表明，在所研究的整个3-7公里深度范围内，渗透性裂缝和断层（即，与明显的热异常有关的那些）靠近库仑破坏线，摩擦系数约为0.6。这表明地壳中的临界应力断层也是最具渗透性的断层。这包括一个位于7.1公里处的主要中生代逆冲断层，该断层在当前应力场中被重新激活为走滑断层。相反，非临界应力断裂和断层似乎不具有渗透性，因为它们与可识别的热异常无关。
To better understand the mechanisms that control fluid flow and hydraulic conductivity at significant depth in the brittle crust, we have examined the relationship between fracture permeability and in situ stress in the German continental deep drillhole (the KTB main hole) through analysis of high resolution temperature profiles. Our analysis shows that over the entire 3–7 km depth range studied, permeable fractures and faults (i.e., those associated with distinct thermal anomalies) lie close to the Coulomb failure line for a coefficient of friction of about 0.6. This indicates that critically‐stressed faults in the crust are also the most permeable faults. This includes a major Mesozoic thrust fault at 7.1 km that is being reactivated as a strike‐slip fault in the current stress field. Conversely, non‐critically stressed fractures and faults do not appear to be permeable as they are not associated with identifiable thermal anomalies.