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页岩是由硬物质与软物质相互嵌混沉积成具有复杂薄层状结构的岩石,其页理面内、面外的性质差异明显,具有复杂的变形、破坏机理.通过对川渝地区龙马溪组露头页岩开展室内宏观力学行为研究,系统地分析了页岩体积变形规律,得到了页岩在压缩应力作用下的4个变形阶段,为研究页岩复杂的破坏规律奠定了基础,同时探讨了不同加载方向与页理面法线方向的夹角对页岩强度、脆性、各向异性等的影响.研究结果表明龙马溪组页岩是一种脆性较高、低孔隙度的岩石,具有各向异性特征但并非十分显著.所得研究结果进一步丰富了页岩数据库,为全面认识页岩的室内力学性质提供了支撑,其相关参数也可为储层压裂改造设计提供参考.
Shale is composed of hard and soft materials mixed into each other into a complex thin-layered structure of the rock, the page surface in-plane and out-of-plane nature of significant differences, with complex deformation and failure mechanism.Through the Sichuan-Chongqing region In order to study the complicated failure rules of shale, the outcrop shale of the Xizhang Formation has carried out a study on the macroscopic mechanical behavior of the shale, systematically analyzed the volume deformation of the shale, and obtained four deformation phases of the shale under compressive stress The influence of the angle between different loading directions and the normal direction of the page surface on shale strength, brittleness and anisotropy is discussed.The results show that the Longmaxi Formation shale is a kind of rock with high brittleness and low porosity, But it is not very significant.The results of the study further enriched the shale database and provided support for the comprehensive understanding of the mechanical properties of shale in the laboratory.The relevant parameters can also provide reference for the design of reservoir fracturing.