Lithologic Reservoirs ›› 2023, Vol. 35 ›› Issue (3): 126-137.doi: 10.12108/yxyqc.20230311

• PETROLEUM EXPLORATION • Previous Articles     Next Articles

Shale oil accumulation conditions of Permian Lucaogou Formation in Fukang fault zone，Junggar Basin

LIU Zhongquan1, ZHAO Leqiang1, ZENG Zhiping1, TIAN Jijun2, LI Zhengqiang2, LUO Jinchang2, HU Meiling3   

  1. 1. Research Institute of Exploration and Development, Shengli Oilfield Company, Sinopec, Dongying 257015, Shandong, China;
    2. College of Geology and Mining Engineering, Xinjiang University, Urumqi 830046, China;
    3. Research Institute of Exploration and Development, PetroChina Huabei Oilfield Company, Renqiu 062552, Hebei, China
  • Received:2022-06-26 Revised:2022-08-11 Online:2023-05-01 Published:2023-04-25

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Abstract: Fukang fault zone is located in the foreland thrust belt of Junggar Basin，with complex structure and great exploration and development potential. The shale oil accumulation conditions of Permian Lucaogou Formation in Fukang fault zone were analyzed through organic geochemical testing of source rocks， cast thin section identification and scanning electron microscope analysis. The results show that： （1）The source rocks of Permian Lucaogou Formation in Fukang fault zone have high organic matter abundance，with an average TOC mass fraction of 3.65%， and the organic matters are mainly type Ⅱ1 with Ro values of 0.76-1.41，mostly in the mature to high mature stage，which is a set of good to high-quality hydrocarbon source rocks.（2）The average porosity of the reservoirs of Lucaogou Formation in the study area is 5.12%， and the permeability ranges from 0.02 mD to 2.69 mD，which is a set of reservoirs with low to extra-low porosity and extra-low permeability. The reservoir rock type is complex，and it is a set of hybrid sedimentary rocks dominated by mud shale， siltstone and carbonate rocks， with an average brittle mineral mass fraction of 82.96%. The reservoir space includes intergranular pores， intercrystalline pores，dissolved pores，organic matter pores and microfractures.（3）The widely overlying hydrocarbon source rocks，the dominant lithofacies distributed continuously in a large area and the favorable sourcereservoir configuration control the shale oil enrichment and accumulation of Lucaogou Formation in the study area， forming a shale oil accumulation model of “source-reservoir adjacent interval type” and “source-reservoir integrated matrix type” coexistence. Dalongkou area and Xiaolongkou to Qi 1 well area are the key areas for the next exploration and development.

Key words: accumulation conditions, hybrid sedimentary rocks, source-reservoir integration, accumulation model, shale oil, Lucaogou Formation, Permian, Fukang fault zone, Junggar Basin

CLC Number: 

  • TE122.1
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