Volume 25 Issue 4
Aug.  2019
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Article Navigation >  Journal of Geomechanics  > 2019  >  25(4): 492-500
LIU Huimin, ZHENG Jinkai, ZHAO Wenshan, et al., 2019. A NEW METHOD FOR EVALUATING BRITTLENESS INDEX OF DEEP TIGHT SANDSTONE RESERVOIR. Journal of Geomechanics, 25 (4): 492-500. DOI: 10.12090/j.issn.1006-6616.2019.25.04.047
Citation: LIU Huimin, ZHENG Jinkai, ZHAO Wenshan, et al., 2019. A NEW METHOD FOR EVALUATING BRITTLENESS INDEX OF DEEP TIGHT SANDSTONE RESERVOIR. Journal of Geomechanics, 25 (4): 492-500. DOI: 10.12090/j.issn.1006-6616.2019.25.04.047
shu

A NEW METHOD FOR EVALUATING BRITTLENESS INDEX OF DEEP TIGHT SANDSTONE RESERVOIR

doi: 10.12090/j.issn.1006-6616.2019.25.04.047
  • 1.

    Manage center of Oil and Gas Exploration, Shengli Oilfield Company, SINOPEC, Dongying 257017, Shandong, China

  • 2.

    Research Institute of Geological Mechanics and Engineering, China University of Petroleum, Qingdao 266580, Shandong, China

More Information
  • Received: 2018-09-22
  • Revised: 2018-12-07
  • Published: 2019-08-01
    Abstract
  • Reservoir rock brittleness evaluation is important foundation work for the design of reservoir fracturing reconstruction scheme, which has great influence on reservoir fracturing reconstruction effect. Taking the deep tight sandstone reservoir in the central part of the Junggar Basin as the research object, the rock triaxial test under 0~90 MPa multilevel confining pressure was carried out and the influence of confining pressure variation on brittleness rock was analyzed. In view of the unsatisfactory effect of the existing brittleness index on the evaluation of rock brittleness in target reservoirs, based on the energy conversion relationship in the stress-strain curve, a new brittleness index model, which includes the pre-peak brittleness index, post-peak brittleness index and the comprehensive brittleness index, is established. The results show that the confining pressure has a significant influence on the evaluation of rock brittleness; the pre-peak brittleness increases first and then decreases with the increase of confining pressure, while the post-peak brittleness and comprehensive brittleness decrease monotonously with the increase of confining pressure. The study shows that the brittleness of the reservoir gravel fine sandstone is poorer than that of the fine sandstone, and the brittleness difference is mainly manifested in post-peak brittleness.

     

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