Lithologic Reservoirs ›› 2019, Vol. 31 ›› Issue (6): 26-35.doi: 10.12108/yxyqc.20190603

• PETROLEUM GEOLOGY • Previous Articles     Next Articles

Sedimentary facies distribution characteristics of Chang 4+5 reservoir in Longdong area,Ordos Basin

ZHENG Qinghua1, LIU Qiao2, LIANG Xiuling2, ZHANG Jiankui2, ZHANG Jianna2, LIU Tao2   

  1. 1. School of Chemistry & Chemical Engineering, Yulin University, Yulin 719000, Shaanxi, China;
    2. No.5 Oil Production Plant, PetroChina Changqing Oilfield Company, Xi'an 710201, China
  • Received:2019-07-14 Revised:2019-08-21 Online:2019-11-21 Published:2019-09-28

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Abstract: In order to study the distribution characteristics of sedimentary facies of Chang 4+5 reservoir in Longdong area of Ordos Basin,core observation,casting thin section identification,heavy mineral testing and log rockelectricity relationship analysis were carried out in outcrop profile and drilling coring. The results show that:(1)The deposits of Chang 4+5 reservoir in Longdong area are mainly controlled by three provenance areas in northeast, southwest and south;(2)Three types of sedimentary facies are mainly developed in the study area,inclu-ding meandering river delta facies in the northeast,braided river delta facies in the southwest and south,and lacu-strine facies in the central region,which can be further divided into five types of subfacies and 10 types of microfacies; (3)The Chang 4+5 reservoir in the study area is mainly characterized by "lake retreat-sand progradation". The lake basin area of Chang 4+51 sublayer is smaller than that of Chang 4+52 sublayer,but the scale of sand body is larger;(4)Compared with the southwest and south,the northeast has a more abundant supply of provenances and many underwater distributary channels converge. As a result,thick sand bodies with overlapping and continuous distribution are more developed. The research results show the exploration potential of Chang 4+5 reser-voir in Longdong area,which can provide reference for further fine exploration.

Key words: sedimentary facies, sand body distribution, provenance, Chang 4+5, Longdong area, Ordos Basin

CLC Number: 

  • TE121.3
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