石油实验地质2019，Vol.41Issue(1)：134-141,8.DOI:10.11781/sysydz201901134
渤海湾盆地沾化凹陷陆相页岩储层岩石力学特征及可压裂性研究
Rock mechanical properties and fracability of continental shale in Zhanhua Sag, Bohai Bay Basin
摘要
Abstract
The rock mechanical properties and fracability of a shale reservoir play an important role in the development of shale oil and gas. There is limited literature on the rock mechanical properties and fracability of continental shale. The mineral composition, compressive strength, Young's modulus and Poisson's ratio of the continental shale in the Shahejie Formation in the Zhanhua Sag were measured by X-ray diffraction and rock mechanical tests under different maturities and confining pressures. The content of carbonate minerals in the shale is the largest, with an average of 44.93％. The content of brittle mineral is slightly higher than that of clay mineral, Which is 30.98％ and 24.09％, respectively. The failure mode of shale is predominantly splitting under uniaxial compression, which easily forms a fracture network. With additional confining pressure, the failure mode changed to shear mode. The compressive strength, Young's modulus and Poisson's ratio all increased with the increase of confining pressure, but the fracability decreased. The fracability of shale is positively correlated with thermal maturity. By considering mineral composition, mechanical properties, diagenesis and confining pressure, a mathematical model of the fracturing coefficient was established to evaluate the fracability of shale reservoir, which can provide a reference for the selection of fracturing layer.关键词
岩石力学/可压裂性/陆相页岩/数学模型/沾化凹陷/渤海湾盆地Key words
rock mechanics/fracability/continental shale/mathematical model/Zhanhua Sag/Bohai Bay Basin分类
能源科技引用本文复制引用
夏遵义,马海洋,房堃..渤海湾盆地沾化凹陷陆相页岩储层岩石力学特征及可压裂性研究[J].石油实验地质,2019,41(1):134-141,8.基金项目
国家科技重大专项"东部断陷盆地页岩油气赋存方式与富集规律研究"(2016ZX05034-001-007)资助 （2016ZX05034-001-007）
