何邦超,张雷

• 1:江苏长江地质勘查院
• 2:中国地震局地质研究所

摘要(Abstract)：

为了探讨含白云石断层的摩擦滑动稳定性，我们使用白云石断层泥开展了水热条件下的摩擦滑动实验研究。实验的有效正应力为60MPa，孔隙流体压力为20MPa，温度范围为25～150℃。实验过程中为了得到白云石摩擦强度系数的速度依赖性，我们将轴向加载速率在5μm/s、1μm/s、0.2μm/s和0.04μm/s之间进行切换。在本研究的温度和压力条件下，我们发现白云石断层泥表现出低温的稳定的速度强化的摩擦滑动行为向高温不稳定黏滑的转变。白云石摩擦强度系数为0.65～0.7，没有表现出显著的温度依赖性。在25～50℃的温度范围，白云石表现出稳定的速度强化的摩擦滑动行为。当温度升高到100℃时，在0.2～0.04μm/s加载速率范围内表现出速度弱化并伴随着黏滑现象，而在1～5μm/s的加载速率下表现出显著的速度强化的摩擦滑动行为。白云石的速率依赖性参数（a-b）值随温度和有效正压力的升高和加载速率的降低表现出有稳定的滑动向不稳定地震成核的转变趋势。因此，对油气储层而言，当其上覆的白云岩岩层被断层穿过时，其在较低的温度范围内（<100℃）也具备了发生不稳定地震成核的条件，需要防范其发生诱发地震的风险。

关键词(KeyWords)： 摩擦滑动稳定性;摩擦强度系数;不稳定地震成核

Abstract:

Keywords:

基金项目(Foundation): 国家重点研发项目“川滇地区活动断裂三维公共模型与大震危险性研究”（2021YFC3000603）

作者(Author): 何邦超,张雷

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