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Formation mechanism and distribution characteristics of Lucaogou shale oil reservoir in Sangtanghu Basin

Chen Xuan1,Liu Xiao-qi2,Wang Xue-chun1,Ma Qiang1,Liu Jun-tian1,Gong Xin1,Yang Xiao-dong3,Shi Jiang-feng3,Bai Guo-juan1   

  1. 1.Exploration and Development Research Institute of PetroChina Tuha Oilfield Company,Hami 839009,China;
    2.Sinopec International Petroleum Engineering Co.Ltd.,Beijing 100020,China;
    3.Western Drilling Tuha Logging Engineering Company,Hami 839009,China
  • Received:2019-02-21 Revised:2019-06-03 Online:2019-08-10

Abstract: The Lucaogou Formation in the Santanghu Basin is affected by Indosinian movement and develops a special lacustrine deposit of volcanic clastic rocks,cloud rocks and argillaceous mixed sediments.The shale oil reservoir in this area is dominated by(medium-acidic)crystal tuff.Crystal chips are mainly composed of felsic which is the phenocryst crystallized early in the volcanic eruption process or the minerals in volcanic channel surrounding rocks.The main reservoir space is the micropores between volcanic dust particles,the micropores of chip corrosion,the cuttings dissolution microporous and micro-cracks.The comprehensive analysis shows that the Lucaogou Formation mainly developed three sets of “sweet sections” in the longitudinal direction,and the thickness was mainly between 5-40 meters.The formation of “sweet sections” is mainly affected by the mineral composition,organic matter abundance of fine-grained tuff and tectonic movement.The interstitial volcanic eruption is key to the formation of high-quality shale oil reservoirs.Dissolution is a main factor for the formation of reservoir micro-reservoir space.The micro-seam and micro-fracture are keys to the reservoir reconstruction.The favorable sweet area of high-quality shale oil is mainly distributed in the abdomen of Malang Sag and the southern margin of Tiaohu Sag.The burial depth is basically 2 500-3 500 meters.These areas have the tendency to form large scale reservoirs.The tuff reservoirs that have been discovered so far are mainly located in the dissolution zone.The oil-gas show is active,and exploration potential is great.

Key words: Shale oil, Tuff, Reservoir characteristics, Formation mechanism, Santanghu Basin

CLC Number: 

  • TE122.2
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