Lithologic Reservoirs ›› 2022, Vol. 34 ›› Issue (2): 31-44.doi: 10.12108/yxyqc.20220203

• PETROLEUM EXPLORATION • Previous Articles     Next Articles

Characteristics and main controlling factors of Triassic Chang 63 reservoir in Fanjiachuan area, Ordos Basin

WEI Qinlian1,2, WANG Chonghuan1,2, LIU Junfeng3, HU Rong1,2, LIU Meirong3, LYU Yujuan3   

  1. 1. School of Earth Science and Engineering, Xi'an Shiyou University, Xi'an 710065, China;
    . 2. Shaanxi Key Laboratory of Petroleum Accumulation Geology, Xi'an Shiyou University, Xi'an 710065, China;
    3. No. 2 Oil Production Plant, PetroChina Changqing Oilfield Company, Qingyang 745100, Gansu, China
  • Received:2021-08-04 Revised:2021-10-15 Online:2022-03-01 Published:2022-03-14

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Abstract: Chang 6 reservoir in Fanjiachuan area of Ordos Basin is a new development area, of which Chang 63 is the main reservoir.In order to study its tight reservoir characteristics and main controlling factors, casting thin sections, conventional physical properties and high-pressure mercury intrusion data were applied to study the petrological characteristics, physical properties and pore structure characteristics of Chang 63 reservoir in Fanjiachuan area of Ordos Basin, recognition functions for different pore structures and diagenetic parameters were established, and the main controlling factors of reservoir performance with different pore structures were analyzed.The results show that:(1) The Chang 63 reservoir in Fanjiachuan area consists of lithic feldspar sandstone with fine lithologies.Clay minerals mainly develop with hydromica, followed by chlorite, and carbonate cements mainly develop with iron dolomite, followed by iron calcite.(2) The Chang 63 reservoir in Fanjiachuan area mainly develops intergranular pores and feldspar dissolved pores, with poor physical properties, and mainly belongs to lowextra low porosity and ultra-low permeability reservoirs, with an average porosity of 9.05% and an average permeability of 0.17 mD.According to the classification standard of pore structure, the pore structures of Chang 6 3 reservoir can be divided into three types, and their throat types and distribution areas distinguished.(3) Sedimentary microfacies is a key factor controlling the physical properties and oil-bearing properties of Chang 63 reservoir in Fanjiachuan area.Compaction is the main diagenesis causing reservoir densification.Cementation and dissolution are important factors resulting in pore structure differences, and the influences of sedimentation and diagenesis are quite different in reservoirs with different pore structures.The research results have guiding significance for the comprehensive evaluation of tight oil of Changqing Oilfield.

Key words: facies control, sandy debris flow, diagenesis, Chang 63 reservoir, Triassic, Fanjiachuan area, Ordos Basin

CLC Number: 

  • TE122.2
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