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Article Navigation >  PETROLEUM GEOLOGY & EXPERIMENT  > 2017  >  39(4): 491-497
Wang Qiongxian, Song Xiaobo, Wang Dong, Long Ke. Reservoir characteristics and formation mechanism of the 4th member of the Leikoupo Formation in Longmen Mountain front[J]. PETROLEUM GEOLOGY & EXPERIMENT, 2017, 39(4): 491-497. doi: 10.11781/sysydz201704491
Citation: Wang Qiongxian, Song Xiaobo, Wang Dong, Long Ke. Reservoir characteristics and formation mechanism of the 4th member of the Leikoupo Formation in Longmen Mountain front[J]. PETROLEUM GEOLOGY & EXPERIMENT, 2017, 39(4): 491-497. doi: 10.11781/sysydz201704491
shu

Reservoir characteristics and formation mechanism of the 4th member of the Leikoupo Formation in Longmen Mountain front

doi: 10.11781/sysydz201704491
  • 1.

    Exploration & Production Research Institute,SINOPEC Southwest Petroleum Company,Chengdu, Sichuan 610041, China

  • 2. Institute of Sedimentary Geology,Chengdu University of Technology, Chengdu, Sichuan 610059, China

  • Received Date: 2017-01-25
  • Rev Recd Date: 2017-06-06
  • Publish Date: 2017-07-28
    Abstract
  • Over one hundred meters of tidal-flat facies dolomite with dissolution-pores developed in the Middle Triassic Leikoupo Formation in the Longmen Mountain front in the western Sichuan Basin. It can be further divided into the upper and lower reservoirs. The analyses of well cores, debris, thin sections and physical properties show that the properties of the lower reservoir, dominated by superposed dolomites, are better than those in the upper reservoir, dominated by limestones. The reservoir formation mechanism was studied using SEM and inclusion homogenization temperature analyses based on rock physical property statistics and reservoir space characteristics. Dolomitization, dissolution in the penecontemporaneous period and dissolution during the burial period formed this good reservoir. Widely distributed dolomites, which developed in a tidal-flat facies, established an important foundation for a steady distribution of reservoirs, dissolution in the penecontemporaneous period determined the formation and distribution of good reservoirs, and dissolution in burial period was favorable for the retention of pores and the increase in permeability, further improving reservoir quality.

     

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