Lithologic Reservoirs ›› 2021, Vol. 33 ›› Issue (2): 116-126.doi: 10.12108/yxyqc.20210212

• PETROLEUM GEOLOGY • Previous Articles     Next Articles

Reservoir characteristics and main controlling factors of Lucaogou Formation in Jimsar Sag,Jungger Basin

ZHANG Zhiheng1, TIAN Jijun1, HAN Changcheng1, ZHANG Wenwen1, DENG Shouwei2, SUN Guoxiang2   

  1. 1. College of Geology and Mining Engineering, Xinjiang University, Urumqi 830047, China;
    2. Research Institute of Exploration and Development, PetroChina Jilin Oilfield Company, Songyuan 138099, Jilin, China
  • Received:2020-08-10 Revised:2020-10-29 Online:2021-04-01 Published:2021-03-31

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Abstract: In order to study the characteristics and main controlling factors of shale oil reservoir of Lucaogou Formation in Jimsar Sag,core observation,cast thin section identification,scanning electron microscope analysis and whole rock analysis were carried out,and petrological characteristics,physical properties and diagenesis were studied. The results show that the rock types of Lucaogou Formation are mainly clastic rocks,carbonate rocks and mixed fine-grained rocks,with low compositional maturity and structural maturity,medium sorting. Primary intergranular pores and secondary dissolved pores are the main reservoir space. The average porosity of sandstone is 7.34%,and the average permeability is 0.079 mD. It belongs to low permeability tight reservoir. Reservoir development is mainly controlled by sedimentation and diagenesis. Sedimentation controls the development and distribution of reservoir rock types. Compaction and cementation are the main reasons for the decrease of reservoir porosity in the process of diagenesis,and dissolution plays a certain role in improving reservoir physical properties. The reservoirs of Lucaogou Formation have experienced three densification stages. Compaction is the main reason for early densification. Continuous compaction and siliceous cementation play a leading role in middle-term densification. Late compaction,carbonate and clay mineral cementation jointly act on the reservoir to further densify the reservoir. The research results can provide a theoretical basis for the study of of shale oil development in Lucaogou Formation of Jimsar Sag.

Key words: reservoir characteristics, main controlling factors, densification process, shale oil, Lucaogou Formation, Jimsar Sag

CLC Number: 

  • TE122.2
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