关键词: 岩石脆性, 致密储层, 压缩形变, 交会图版法

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