岩石脆性评价方法进展

Review of rock brittleness evaluation methods

脆性是岩石(尤其是深部岩石)的一种非常重要的性质,脆性研究对深部岩体工程建设和资源开发利用等具有重要意义。在页岩油气和致密油气储层"七性"评价中,脆性是地层可钻性分析、压裂选层及施工参数优选的重要指标。国内外学者针对岩石脆性开展了大量研究工作,但是关于岩石脆性的定义和评价方法仍存在分歧,岩石脆性的定量描述还没有一个统一的标准。本文总结了各种现有岩石脆性评价方法的基本原理和研究、应用现状,探讨了岩石脆性评价存在的问题及今后的发展趋势,以期为岩石脆性评价新方法的提出以及评价标准的建立提供参考。

The brittleness is one of the most important mechanical properties of rocks,especially in deep formations.The research on brittleness is of great significance to the deep rock mass engineering and the underground resources development.In recent years,the brittleness has become a significant descriptor in optimizing construction parameters and guiding hydraulic fracturing for unconventional oil and gas reservoirs.However,there are still some conflict understandings on the definition and evaluation of rock brittleness,and there are no widelyaccepted rules or standards for the brittleness quantitative characterization.In this paper,the basic principle,research progress and application status of various rock brittleness evaluation methods have been summarized,and existing problems and the future development trend of rock brittleness evaluation have been discussed.This paper provides a reference for the rock brittleness evaluation criteria.