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The characteristics and their controlling factors on reservoir in Permian Lower Urho Formation in Mahu Sag，Junggar Basin

Fu Shuang1，2，3，Pang Lei4，Xu Xue-long5，Cao Yuan-ting4，Liu Zhen-yu4，Zhang Shun-cun1，2   

  1. 1.Northwest Institute of Eco-Environment and Resources，Chinese Academy of Sciences，Lanzhou 730000，China； 
    2.Key Laboratory of Petroleum Resource of Gansu Province/Key Laboratory of Petroleum Resource Research of CAS，Institute of Geology and Geophysics，Chinese Academy of Sciences，Lanzhou 730000，China；
    3.University of Chinese Academy of Sciences，Beijing 100049，Chiuna；
    4.Institute of Exploration and Development of Xinjiang Oil Field Company，PetroChina，Karamay 843000，China；
    5.Zhudong Oil Production Plant，Xinjiang Oil Field Company Ltd.，PetroChina，Fukang 831511，China
  • Received:2018-08-11 Revised:2019-01-22 Online:2019-04-10

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Abstract: The Permian Lower Uhro Formation is an important strata for petroleum exploration and shows good prospects in Mahu Sag，which is the highest degree in accumulation of petroleum in Juggar Basin.In order to support and offer reference for further exploration and exploitation，based on core observation，thin section，scanning electron microscopy (SEM)，mercury injection experiment，CT scanning，as well as mathematics statistics，the characteristics and controlling factors of Lower Urho Formation have been discussed.The results indicate that the reservoir of Lower Urho Formation has especially low porosity and low permeability with multiple types of rocks，which have a high content of volcanic materials and low maturity.The variety of pores with thin throats are dominated by residual intergranular pores，microcracks，intragranular dissolved pores，and reservoir heterogeneity is strong.Influencing factors on physical properties of reservoirs are sedimentation，diagenesis and tectonism.Sedimentation plays a significant role in reservoir controlling factors，and reservoirs with good physical properties are mainly developed in under-water distributary channel and upper-water distributary channel with strong hydrodynamics and less argillaceous content.Compaction is the main destructive diagenesis and cementation is the second.The compaction caused 70% primary pores to disappeare.Dissolution is the constructive diagenesis.Secondary pores formed by dissolution improve physical property，and the secondary pore zone is mainly developed in under-water distributary channel and upper-water distributary channel.Microfractures produced by tectonic activities enhance the heterogeneity of reservoir and improve effectively physical property of reservoir.

Key words: Reservoir characteristics, Controlling factors, Lower Urho Formation, Mahu Sag, Junggar Basin

CLC Number: 

  • TE122.2+3 
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