Lithologic Reservoirs ›› 2021, Vol. 33 ›› Issue (6): 39-47.doi: 10.12108/yxyqc.20210605

• PETROLEUM GEOLOGY • Previous Articles     Next Articles

Characteristics and indication of fluid inclusions of Jurassic Zhiluo Formation in south-central Ordos Basin

YANG Shuisheng1, WANG Huizhi1, YAN Xiaolong1, FU Guomin2   

  1. 1. Research Center of Exploration and Development Technology, Yanchang Oilfield Co., Ltd., Yan'an 716000, Shaanxi, China;
    2. School of Earth Science and Resources, Chang'an University, Xi'an 710045, China
  • Received:2021-04-20 Revised:2021-07-07 Online:2021-12-01 Published:2021-11-25

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Abstract: In order to clarify the characteristics of fluid inclusions and their indication of Jurassic Zhiluo Formation in south-central Ordos Basin, micro thermometry, micro fluorescence, burial history and thermal history simulation of inclusions were applied to carry out the analysis. The results show that there are mainly two stages of oil and gas inclusions in Zhiluo Formation in the study area. The early stage of oil and gas inclusions are mainly distributed in dissolved pores on the surface of quartz particles and the early fractures of quartz, with low maturity and orange-yellow-green fluorescence. The homogenization temperature of brine inclusions in the same period ranges from 250 ℃ to 320 ℃. The late stage of oil and gas inclusions are mainly distributed in the late quartz fractures, with high maturity and dark green fluorescence. The homogenization temperature of brine inclusions in the same period is 120-180 ℃. Combined with the study of burial history and thermal history, the homogenization temperature of inclusions is higher than the formation temperature, the distribution range is large, and the temperature discontinuity is obvious in the two stages. It is speculated that the oil and gas migration and accumulation in Zhiluo Formation are affected by tectonic thermal events, which is a relatively long and discontinuous process. The research results are of great significance to the study of reservoir forming mechanism of Zhiluo Formation and are important to the further breakthroughs of oil and gas exploration in the study area.

Key words: fluid inclusions, homogenization temperature, diagenetic evolution, hydrocarbon charging, Zhiluo Formation, Ordos Basin

CLC Number: 

  • TE122.1
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