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Article Navigation >  PETROLEUM GEOLOGY & EXPERIMENT  > 2019  >  41(1): 134-141
XIA Zunyi, MA Haiyang, FANG Kun. Rock mechanical properties and fracability of continental shale in Zhanhua Sag, Bohai Bay Basin[J]. PETROLEUM GEOLOGY & EXPERIMENT, 2019, 41(1): 134-141. doi: 10.11781/sysydz201901134
Citation: XIA Zunyi, MA Haiyang, FANG Kun. Rock mechanical properties and fracability of continental shale in Zhanhua Sag, Bohai Bay Basin[J]. PETROLEUM GEOLOGY & EXPERIMENT, 2019, 41(1): 134-141. doi: 10.11781/sysydz201901134
shu

Rock mechanical properties and fracability of continental shale in Zhanhua Sag, Bohai Bay Basin

doi: 10.11781/sysydz201901134

  • 1. College of Engineering, Peking University, Beijing 100871, China;

  • 2. School of Petroleum Engineering, China University of Petroleum(East China), Qingdao, Shandong 266580, China

  • Received Date: 2018-09-19
  • Rev Recd Date: 2018-12-11
  • Publish Date: 2019-01-28
    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.

     

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