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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 >Evolution of strength recovery and permeability during fluid-rock reaction in experimental fault zones
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Evolution of strength recovery and permeability during fluid-rock reaction in experimental fault zones

机译：实验断层带流体岩石反应过程中强度恢复和渗透率的演变

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摘要

Physical and chemical fluid-rock interactions are implicated in controlling earthquake nucleation and recurrence. In particular, interseismic compaction, sealing and healing of fractured fault rocks can lead to strength recovery and stabilisation of fault zones. In contrast, these same processes can also assist increases in pore fluid pressures and consequent destabilisation of faults. Here, we present high-temperature, hydrothermal experiments designed to assess the evolution of strength of fault zones in previously intact rock, and also characterise the associated changes to porosity and permeability. Cores of Fontainebleau sandstone were initially loaded to failure in a high-pressure gas-medium apparatus. The failed specimens were then hydrothermally reacted at 927 ℃ for variable duration under isostatic conditions, and subsequently re-fractured to determine the 'interseismic' strength recovery. In the most extreme case, hydrothermally induced gouge compaction, cementation and crack healing resulted in 75% strength recovery after reaction for 6 h. Isostatic hydrothermal treatment also resulted in dramatic reduction in porosity and permeability. Strength of the fault zone following hydrothermal reaction appears to be closely correlated to porosity, consistent with previous studies on brittle failure of porous aggregates. The experimental results show how hydrothermal reactions in fault zones may lead to two competing, time-dependent effects; fault strengthening due to increased cohesion in the fault zone and fault weakening arising from elevated pore pressures within a well cemented, low-permeability gouge layer.
机译：物理和化学流体-岩石相互作用与控制地震成核和复发有关。特别是，裂隙断层岩的间震压实，封闭和愈合可以导致断层带的强度恢复和稳定。相比之下，这些相同的过程也可以帮助增加孔隙流体压力，进而破坏断层。在这里，我们提出了高温水热实验，旨在评估先前完整岩石中断层带强度的演变，并描述孔隙度和渗透率的相关变化。枫丹白露砂岩的岩心最初在高压气体介质设备中加载至失效。然后将破裂后的试样在等静压条件下于927℃进行水热反应可变的时间，然后重新破碎以测定“抗震”强度。在最极端的情况下，水热引起的凿击压实，胶结和裂缝愈合导致反应6小时后强度恢复75％。等静压水热处理还导致孔隙率和渗透率显着降低。热液反应后断层带的强度似乎与孔隙率密切相关，这与先前对多孔骨料脆性破坏的研究一致。实验结果表明，断层带的水热反应如何导致两种相互竞争的，时间相关的效应。由于在胶合良好的低渗透胶泥层中孔隙压力升高而引起的断层带内聚力增加和断层减弱导致断层强化。

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