Study on Characteristics of Chang 8 Tight Sandstone Reservoir in Eastern Xifeng Area,Ordos Basin
[Purposes]In order to clarify the characteristics of the Chang 8 tight reservoir and its control-ling factors in the eastern Xifeng of Ordos Basin,this paper is based on various reservoir characteristic parameters.[Methods]The paper uses various analytical tests such as log curve analysis,rock sheet ob-servation,high-pressure mercury intrusion method and scanning electron microscope microscopy to ana-lyze the sedimentary phase signatures of the Chang 8 reservoir sandstone in the study area,the character-istics of rock debris and filler,pore characteristics and physical properties,and to explore the influence of complex diagenesis on the reservoir characteristics.Finally,the influence of complex diagenesis on reservoir characteristics was also discussed.[Findings]The study shows that the quality reservoir lithol-ogy in the Chang 8 tight reservoir in the eastern Xifeng is dominated by(medium)fine-grained rock chip feldspathic sandstone and feldspathic rock chip sandstone.Pores,inlay-pore cementation and line con-tact are common.Residual intergranular pores and feldspar dissolved pores are developed,and fine-micropore fine throat or micropore fine throat pore structure is common.[Conclusions]Compaction and calcite cementation are the main factors of reservoir densification,while the cementation and accounting of iron calcite,chlorite film and dissolution are the main factors for the development of high-quality res-ervoirs.
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