基于能量平衡的新脆性指标与页岩失效机制分析

doi:10.13722/j.cnki.jrme.2021.0732

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摘要为了建立表征深部页岩气储层的脆性指标，基于能量平衡理论，考虑岩石系统对外界能量的转化率以及径向膨胀对其脆性特征的影响，提出一种新的脆性评价方法。该评价方法从3个方面定量表征岩石的脆性特征：岩石失效速率()、峰后失稳度()和峰前塑性屈服度()，并根据地层信息进行一系列三轴压缩试验进行验证。结果表明：页岩的脆性特征随地层水平(围压、温度)的升高不断衰减；与现有脆性指标相比，新脆性指标可以更好地描述不同试验条件下页岩的脆性特征，特别是高围压(110 MPa)和高温度(190 ℃)条件下页岩的脆性评价；从强度成分分析页岩的脆性失效机制，页岩强度包络线体现出双线性特征；通过建立宏观断裂模式、脆性特征以及临界主应力比之间的相关性，量化页岩宏观断裂形态临界条件；损伤度通过提高峰前塑性屈服度和弹性能贡献率，降低了页岩的脆性指标。

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	刘俊新1
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	李军润1
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	尹彬瑞1
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	唐伟1
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	袁玉松4
	朱宝龙1
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关键词 ：岩石力学, 页岩, 脆性评价, 能量平衡, 地层, 脆性失效机制, 宏观断裂特征

Abstract：Aiming to establish the brittleness index for characterizing deep shale gas reservoirs，a new brittleness evaluation method，characterizing the brittleness of rock from three aspects such as rock failure rate()，post-peak instability() and pre-peak plastic yield()，was proposed based on energy balance theory in consideration of the energy conversion rate of the rock system to the outside and the effect of radial expansion on brittleness characteristics，and a series of triaxial compression tests designed according to shale-formation information were conducted to verify the applicability of the index. The test results show that the brittleness characteristics of shale decrease with increasing “formation level”(i.e.，the confining pressure and the temperature)，and compared with the existing brittleness indices，the new brittleness index is superior in describing the brittleness characteristics of shale under different test conditions，especially in the condition of high confining pressure(at 100 MPa) and high temperature(at 190 ℃). Besides，the brittle failure mechanism of shale was analyzed in terms of strength factors，and it is revealed that the strength envelope curve of shale presents bilinear characteristic. Meanwhile，a critical condition for macroscopic fracture patterns of shale was quantified by establishing the correlation of the macroscopic fracture pattern，the brittleness characteristics and the critical principal stress ratio. It is also found that the damage degree of shale can reduce the brittleness characteristics of shale by increasing the pre-peak plastic yield and the contribution rate of the elastic energy.

Key words： rock mechanics')" href="#">

rock mechanics shale brittleness evaluation energy balance formation brittle failure mechanism macroscopic failure characteristics

引用本文:

刘俊新1，2，李军润1，2，尹彬瑞1，2，唐伟1，2，3，袁玉松4，朱宝龙1，2. 基于能量平衡的新脆性指标与页岩失效机制分析[J]. 岩石力学与工程学报, 2022, 41(4): 734-747.
LIU Junxin1，2，LI Junrun1，2，YIN Binrui1，2，TANG Wei1，2，3，YUAN Yusong4，ZHU Baolong1，2. New brittleness index based on energy balance and analysis of failure mechanism of shale. , 2022, 41(4): 734-747.

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http://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2021.0732 或 http://rockmech.whrsm.ac.cn/CN/Y2022/V41/I4/734

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