Lithologic Reservoirs ›› 2021, Vol. 33 ›› Issue (6): 70-80.doi: 10.12108/yxyqc.20210608

• PETROLEUM GEOLOGY • Previous Articles     Next Articles

Sedimentary facies characteristics and favorable reservoirs distribution of Lower Triassic Feixianguan Formation in Fuling area

REN Jie1, HU Zhonggui1, HU Mingyi1, LI Xiong2, PANG Yanrong1, ZUO Mingtao1, HUANG Yufei1   

  1. 1. Sedimentary Basin Research Center, Yangtze University, Wuhan 430100, China;
    2. Research Institute of Exploration and Development, Jianghan Oilfield Branch, Sinopec, Wuhan 430223, China
  • Received:2021-02-19 Revised:2021-05-07 Online:2021-12-01 Published:2021-11-25

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Abstract: In recent years, major breakthroughs have been made in oil and gas exploration of Feixianguan Formation in Kaijiang-Liangping trough of Sichuan Basin, showing good prospects for oil and gas discovery. In order to study the sedimentary facies characteristics and the distribution of favorable reservoirs of Lower Triassic Feixianguan Formation, research work such as core observation, seismic interpretation, and comprehensive analysis of drilling and logging data were carried out. Based on high-frequency sequence division and identification of sedimentary facies markers, the sedimentary facies characteristics of Feixianguan Formation were clarified. The results show that: (1) Gentle slope platforms developed in the early stage of Feixianguan Formation, and fringed platforms developed in the middle to late stage in the study area; the platform margin beach bodies in the upper fourth-order sequence framework of the region have a progradation type migration pattern, the platform margin beach bodies in the northern part of Fuling area mainly developed during the sq3-HST period, forming a twostage combination of beach bodies and distributed stably in the region. (2) Reservoirs of Feixianguan Formation in the study area are mainly developed in northern Fuling area, with platform margin beach facies(oolitic beaches, bioclastic beaches) as the main reservoirs, and the reservoir rocks are sprite oolitic limestone, sandy limestone, residual grain dolomite and crystal grain dolomite. (3) The well areas of Xinglong 1, Xinglong 2, Xinglong 3, Fushi 1, Fushi 2 and Baxiang 1 in northern Fuling area are favorable for reservoir development. The research results can provide a reference for the next exploration of Lower Triassic Feixianguan Formation in Fuling area.

Key words: sedimentary facies, bioclastic beach, favorable reservoir, Feixianguan Formation, Lower Triassic, Fuling area

CLC Number: 

  • TE122.2
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