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Article Navigation >  PETROLEUM GEOLOGY & EXPERIMENT  > 2018  >  40(5): 621-631
CHEN Yulin, ZENG Yan, DUAN Yongming, WANG Qiongxian. Pore structure characteristics and reservoir classification of dolomite reservoirs in fourth member of Leikoupo Formation, Longmen Mountain front, western Sichuan Basin[J]. PETROLEUM GEOLOGY & EXPERIMENT, 2018, 40(5): 621-631. doi: 10.11781/sysydz201805621
Citation: CHEN Yulin, ZENG Yan, DUAN Yongming, WANG Qiongxian. Pore structure characteristics and reservoir classification of dolomite reservoirs in fourth member of Leikoupo Formation, Longmen Mountain front, western Sichuan Basin[J]. PETROLEUM GEOLOGY & EXPERIMENT, 2018, 40(5): 621-631. doi: 10.11781/sysydz201805621
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Pore structure characteristics and reservoir classification of dolomite reservoirs in fourth member of Leikoupo Formation, Longmen Mountain front, western Sichuan Basin

doi: 10.11781/sysydz201805621

  • 1. Post-Doctoral Scientific Research Station, SINOPEC Southwest Oil & Gas Company, Chengdu, Sichuan 610041, China;

  • 2. Research Institute of Exploration and Development, SINOPEC Southwest Oil & Gas Company, Chengdu, Sichuan 610041, China;

  • 3. SINOPEC Southwest Oil & Gas Company, Chengdu, Sichuan 610041, China

  • Received Date: 2017-12-25
  • Rev Recd Date: 2018-09-03
  • Publish Date: 2018-09-28
    Abstract
  • The pore structure characteristics of the tidal-flat dolomite reservoirs of the fourth member of Leikoupo Formation in the Longmen Mountain front in the western Sichuan Basin were studied through core observation, casting thin films, physical property tests, capillary pressure curves and CT scanning. There are four types of reservoir:pore, fracture-pore, pore-vuggy and fracture-pore-vuggy type, which can be distinguished by displacement pressure, sorting coefficient, proportion of connected pores, coordination number and pore aspect ratio. A reservoir classification standard was established combined with reservoir space combination type. For type I reservoirs (Φ ≥ 12%), the fracture-pore type reservoir is the most favorable, while the pore type was second. For type Ⅱ reservoirs (6% ≤ Φ < 12%), the fracture-pore type and fracture-pore-vuggy type reservoirs are the most favorable, while the pore type was second. For type Ⅲ reservoirs (2% ≤ Φ < 6%), the fracture-pore type and fracture-pore-vuggy type reservoirs are favorable.

     

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