Lithologic Reservoirs ›› 2017, Vol. 29 ›› Issue (6): 51-59.doi: 10.3969/j.issn.1673-8926.2017.06.007

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Tight sandstone reservoir characteristics and diagenesis evolution of Taiyuan Formation in Shenmu-Fugu area,Ordos Basin

LIU Zaizhen, LIU Yuming, LI Yangbing, LIU Xueqing, WANG Yuesheng, WANG Haiyan   

  1. Ener Tech-Drilling & Production Company, CNOOC, Tianjin 300452, China
  • Received:2017-05-02 Revised:2017-08-18 Online:2017-11-21 Published:2017-11-21

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Abstract: In order to elucidate sandstone reservoir characteristics of Taiyuan Formation and its genesis of the densification in Shenmu-Fugu area,Ordos Basin,based on the data of cast thin section,scanning electron microscope,cathodoluminescence and high-pressure mercury,cementation and metasomatism between the cement and its relation with clastic particles,the diagenetic sequence and porosity evolution process were analyzed. The results show that the reservoir is dominated by medium-coarse lithic sandstone and feldspathic lithic sandstone. The reservoir porosity is 0.20%-12.00%, with average of 6.95%, and the permeability is 0.10-5.00 mD, with average of 0.91 mD,which belongs to typical low-porosity and extra-low-permeability tight sandstone reservoir.The pore structure is mainly small pore with fine throat and small pore with micro throat. The porosity evolution shows that the porosity decreased 15.5% by compaction,reduced about 10.4% by cementation,and increased about 4.41% by dissolution. The calculated reservoir porosity of Taiyuan Formation is 7.17%,which is similar to the analyzed porosity of 6.95% in the laboratory. Early compaction and late carbonate cementation are the main causes for the reservoir densification,while dissolution is beneficial to develop secondary pores for improving reservoirs properties.

Key words: CO2 flooding, grey correlation analysis, oil recovery, suitability

CLC Number: 

  • TE122.2+3
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