Abstract: There are many methods available to evaluate rock brittleness，but they are very different from each other. They are suitable for evaluating conventional sandstone reservoirs，but not for shale and conglomerate reservoirs with strong heterogeneity. Therefore，to evaluate the brittleness of strongly heterogeneous reservoirs，it is necessary to establish a static qualitative classification standard first for rock brittleness，and then to establish a connection with the quantitative brittleness characterization method. This study addresses the Permian shale oil reservoir in Jimsar area of Junggar Basin. The static Young's elastic modulus and Poisson's ratio of the cores were measured，and the curves and rock fracture forms obtained were analyzed using the crossplot method. As a result，the brittleness is divided into three types:good，moderate and poor. This study makes full use of the test data of rock mechanics to analyze the brittleness of the target interval，which provides technical support for selecting suitable fracturing fluid and technique in this area.

Key words: rock brittleness, tight reservoir, compressive deformation, crossplot method

摘要： 岩石脆性现有的评价方法很多，但相互间的差异很大，在常规砂岩储层的适用性较好，在强非均质的页岩、砾岩储层适用性差。因此，对强非均质储层的脆性评价首先要建立静态的岩石脆性定性分类标准，然后才能与定量脆性表征方法建立联系。以准噶尔盆地吉木萨尔地区二叠系页岩油储层为实验研究对象，测定岩心的静态杨氏模量和泊松比，并对获得的曲线及岩石破裂形态采用交会图版法进行分析，分为较好脆性、中等脆性、较差脆性三类。该研究充分利用岩石力学实验数据对目的层段进行脆性分析，为该区选择合适的压裂液和压裂工艺提供技术支撑。

关键词: 岩石脆性, 致密储层, 压缩形变, 交会图版法