综合矿物组分和弹性力学参数的页岩脆性评价方法

Evaluation of shale brittleness based on mineral compositions and elastic mechanics parameters

利用常规测井和阵列声波、元素俘获等特殊测井资料,结合X衍射和岩石三轴抗压强度等岩石力学实验,综合考虑不同矿物组分与弹性力学参数的关系,建立了一种新的脆性指数评价模型。新的岩石脆性计算方法既克服了岩石力学参数法不考虑微观矿物组分的缺点,又解决了矿物组分法对宏观岩石力学参数缺乏考虑的问题。与已有的脆性指数计算方法相比,新方法较准确地体现了不同矿物组分对页岩脆性的贡献率,为研究区页岩储层的压裂工作奠定了基础。

Using special well logging data such as conventional logging,array acoustic wave and element capture,combining with rock mechanics experiments such as X-ray diffraction and rock triaxial compressive strength,considering the relationship between different mineral components and elastic mechanics parameters,a new brittleness index evaluation model is established.The new calculation method solves not only the problem of rock mechanics parameter method of the lack of micro-mineral components,but also the less consideration of macro-rock mechanics the mineral component method.The new brittleness index calculation reflects the contribution rate of different mineral components to shale brittleness more accurately,and lays a foundation for the fracturing work of shale reservoirs in the study area.