Lithologic Reservoirs ›› 2021, Vol. 33 ›› Issue (4): 20-28.doi: 10.12108/yxyqc.20210403

• PETROLEUM GEOLOGY • Previous Articles     Next Articles

Sedimentary characteristics of sandy conglomerates of Triassic Xu-3 member in northwestern Sichuan Basin

ZHANG Benjian1, TIAN Yunying1, ZENG Qi1, YIN Hong1, DING Xiong2   

  1. 1. Northwestern Sichuan Gas District, PetroChina Southwest Oil and Gas Field Company, Jiangyou 621700, Sichuan, China;
    2. School of Geosciences and Technology, Southwest Petroleum University, Chengdu 610500, China
  • Received:2020-08-09 Revised:2020-09-10 Online:2021-08-01 Published:2021-08-06

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Abstract: In recent years,there are new discoveries in natural gas exploration of the third member of Xujiahe Formation（Xu-3 member）of Triassic in northwest Sichuan Basin. In order to systematically study the sedimentary characteristics of sandy conglomerates of Triassic Xu-3 member in northwestern Sichuan Basin,drilling core observation,logging interpretation,facies identification and dominant facies analysis of sandy conglomerates were carried out. The results show that： （1）Sandy conglomerates were developed in braided channels and overflow deposition in alluvial fan and distributary channels,subaqueous distributary channels,mouth bars and distal bars in fan delta of Xu-3 member in the study area. The braided channel was mainly composed of massive conglomerate, with more conglomerates and less sandstone,and overflow deposition mainly developed tabular cross bedding and parallel bedding,with more sandstone and less conglomerates,showing positive grain order characteristics of upward thinning.（2）Fan deltas were dominated by sandstone,the braided distributary channels,subaqueous distributary channels,mouth bars and distal bars developed scour surface,tabular cross bedding,parallel bedding and sandy cross bedding. Braided distributary channels and subaqueous distributary channels have fining-upwards normal cycle as the dominate features. Mouth bars and distal bars have coarsening-upwards normal cycle as the dominate features.（3）Sandy conglomerates were mostly developed in the braided channels,overflow depo-sition and braided distributary channels,followed by subaqueous distributary channels,mouth bars and distal bars. The research results have reference significance for natural gas exploration of Triassic Xu-3 member in northwestern Sichuan Basin.

Key words: sedimentary characteristics, sandy conglomerates, alluvial fan, fan delta, Xu-3 member, Triassic, northwestern Sichuan Basin

CLC Number: 

  • TE122.1
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