Lithologic Reservoirs ›› 2020, Vol. 32 ›› Issue (5): 63-72.doi: 10.12108/yxyqc.20200507

• PETROLEUM GEOLOGY • Previous Articles     Next Articles

Reservoir characteristics and controlling factors of Chang 6 of Yanchang Formation in Wuqi area,Ordos Basin

WANG Peng1,2, SUN Linghui2,3, WANG He1, LI Zian1   

  1. 1. Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China;
    2. Graduate School of Chinese Academy of Sciences, Beijing 100864, China;
    3. PetroChina Research Institute of Petroleum Exploration & Development, Beijing 100083, China
  • Received:2019-12-30 Revised:2020-01-15 Online:2020-10-01 Published:2020-08-08

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Abstract: Chang 6 oil reservoir in Wuqi area of Ordos Basin is a set of typical tight-sandstone oil reservoirs. To find out the micro characteristics of the reservoir and analyze the controlling factors that affect the development of the reservoir are helpful to clarify its influence on the accumulation of tight oil. By means of thin section identification, porosity and permeability test,casting thin section, scanning electron microscope and high-pressure mercury injection, the petrological characteristics, physical properties and pore characteristics,pore structure characteristics and reservoir types of Chang 6 reservoir were studied,and the influence of diagenesis on reservoir development was analyzed.The results show that the rock type of Chang 6 reservoiris mainly feldspathic sandstone. The porosity ranges from 6% to 12%, with an average of 9.45%, and the permeability ranges from 0.05 mD to 0.50 mD, with an average of 0.34 mD. The main types of reservoir space include residual intergranular pores and dissolved pores, which have four different kinds of pore structures,and their pore-throat distributionare slightly different. The type Ⅰ samples have more macropores,with peak pore throat radius of 3-5 μm and good pore throat connectivity,followed by type Ⅱ and type Ⅲ samples,and the type IV sample is the worst. The Chang 6 reservoir in Wuqi area is mainly in the late diagenesis stage A. The cementation mainly includes siliceous cementation,clay mineral cementation and carbonate cementation. Among them,chlorite cementation supports more of the pores, and illite cementation and carbonate cementation fill or block the pores. The feldspar,cuttings and interstitials such as turbidities were dissolved,and the formation of secondary dissolved pores significantly improved the reservoir properties.

Key words: pore structure, diagenesis, Chang 6 oil reservoir, Yanchang Formation, Wuqi area, Ordos Basin

CLC Number: 

  • TE122.2+3
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