Lithologic Reservoirs ›› 2021, Vol. 33 ›› Issue (6): 124-134.doi: 10.12108/yxyqc.20210613

• PETROLEUM GEOLOGY • Previous Articles     Next Articles

Reservoir characteristics and main controlling factors of Yan 10 sandy braided fluvial facies in Anbian area,Ordos Basin

ZHAO Xiaomeng1, GUO Feng1, PENG Xiaoxia2, ZHANG Cuiping3, GUO Ling2, SHI Yuxiang2   

  1. 1. Shaanxi Key Laboratory of Petroleum Accumulation Geology, Xi'an Shiyou University, Xi'an 710069, China;
    2. State Key Laboratory of Continental Dynamics, Northwest University, Xi'an 710127, China;
    3. No.6 Oil Production Plant, PetroChina Changqing Oilfield Company, Xi'an 710016, China
  • Received:2021-03-09 Revised:2021-05-18 Online:2021-12-01 Published:2021-11-25

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Abstract: To clarify the characteristics and main controlling factors of sandy braided fluvial reservoir, Yan 10 reservoir in Anbian area of Ordos Basin was comprehensively verified by grain size analysis, cast thin section, scanning electron microscope, mercury injection method and conventional physical property analysis, combined with core and logging data. The results show that sandy braided fluvial facies are developed in Yan 10 reservoir in Anbian area, including channel, central bar and flood plain microfacies. The reservoir lithology is mainly feldspathic quartz sandstone and lithic quartz sandstone, and the reservoir space is mainly composed of residual intergranular pores and feldspar dissolved pores. Three main types of throats can be identified, including meso fine throat, micro fine throat and micro throat. The porosity ranges from 11.23% to 17.95%, and the permeability is generally 5.35-56.57 mD, which belongs to medium-low porosity and low-ultra low permeability fine throat reservoir. Sedimentary microfacies are the material factors that affect the physical properties of Yan 10 reservoir. Compaction and cementation of clay minerals, siliceous and calcareous are destructive diagenesis, among which compaction is the main factor. The dissolution of feldspar particles and some cements and the inhibition of chlorite film on compaction and cementation are constructive diagenesis. The research results are of great significance for the prediction of favorable reservoirs in braided river facies.

Key words: braided river, reservoir characteristics, controlling factors, Yan'an Formation, Ordos Basin

CLC Number: 

  • TE122.2
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