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Volume 44 Issue 1
Jan.  2022
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Article Navigation >  PETROLEUM GEOLOGY & EXPERIMENT  > 2022  >  44(1): 160-169
SUN Ke, XU Ke, CHEN Qinghua. Characterization of the length of structural fractures in low permeability reservoirs and its application: a case study of Longwangmiao Formation in Moxi-Gaoshiti areas, Sichuan Basin[J]. PETROLEUM GEOLOGY & EXPERIMENT, 2022, 44(1): 160-169. doi: 10.11781/sysydz202201160
Citation: SUN Ke, XU Ke, CHEN Qinghua. Characterization of the length of structural fractures in low permeability reservoirs and its application: a case study of Longwangmiao Formation in Moxi-Gaoshiti areas, Sichuan Basin[J]. PETROLEUM GEOLOGY & EXPERIMENT, 2022, 44(1): 160-169. doi: 10.11781/sysydz202201160
shu

Characterization of the length of structural fractures in low permeability reservoirs and its application: a case study of Longwangmiao Formation in Moxi-Gaoshiti areas, Sichuan Basin

doi: 10.11781/sysydz202201160
  • 1.

    SINOPEC Petroleum Exploration and Production Research Institute, Beijing 102206, China

  • 2.

    School of Geoscience, China University of Petroleum (East China), Qingdao, Shandong 266580, China

  • 3.

    PetroChina Tarim Oilfield Company, Korla, Xinjiang 841000, China

  • Received Date: 2021-03-30
  • Rev Recd Date: 2021-11-02
  • Publish Date: 2022-01-28
    Abstract
  • In order to classify the quantitative characterization method of structural fracture length in low-permeability reservoirs, the Cambrian Longwangmiao Formation of Moxi-Gaoshiti areas in the Sichuan Basin is taken an example in this study. The relationship between structural fracture lengths of low-permeability reservoirs was derived from the perspective of structural stress field by the means of core fracture statistics and rock mechanical experiment. Quantitative relationships between fracture length and fracture volume density, strain energy density and rock mass stress state were established. Results showed a negative exponential power relationship between fracture length and number, a proportional linear relationship between fracture volume density and strain energy density, and a negative exponential power relationship between fracture length and volume density. The derived fracture length formula was applied to the Longwangmiao Formation in Moxi-Gaoshiti areas. Numerical simulation results showed that fracture density generally ranges from 1-5 m2/m3, and the highest value is 9 m2/m3, mainly distributed in fault and its surrounding areas. Fracture length is mainly between 1-20 m. The fractures in fault and surrounding areas are dense and short, usually less than 3 m.

     

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