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Hydrocarbon charging history of the lower petroleum system in the southern Junggar Basin: Case study of the Qigu Oil Field

Hu Han-wen1,Zhang Yuan-yuan2,Zhuo Qin-gong3,Jia Cheng-zao3,Guo Zhao-jie2   

  1. 1.Research Institute of Petroleum Exploration and Production,SINOPEC,Beijing 100083,China;2.Key Laboratory of Orogenic Belts and Crustal Evolution,Ministry of Education,School of Earth and  Space Science,PekingUniversity,Beijing 100871,China;3.Research Institute of Petroleum Exploration and Development,PetroChina,Beijing 100083,China
  • Received:2018-11-19 Revised:2019-03-14 Online:2019-04-10

Abstract: The Permian-Jurassic petroleum system in the southern Junggar Basin is important and potential.However,divergence still exists in the hydrocarbon accumulation history in this area.Integrated methods,such as organic geochemistry,granular fluorescence technology,fluid inclusion analysis and basin modeling,were used to discuss the hydrocarbon charging history of the lower petroleum system in the Qigu Oil Field.The results show that the crude oil has the characteristics of gas washing like the heavy density and much wax.Hydrocarbon displays differential fluorescent properties in different formations and in the two sides of faults.The low-maturity oil charged the Lower Jurassic reservoirs at ~100Ma before it charged the Middle Jurassic reservoirs at ~45Ma.The high-maturity oil charged the Lower Jurassic-Middle Jurassic Xishanyao Formation reservoirs at ~7Ma.During the tectonic activities in the Late Cenozoic,the paleo oil reservoirs were adjusted and the gas washed the Permian-Jurassic reservoirs.Multiple stages of hydrocarbon charging resulted in the complex distributions of oil and gas.Gas and most oil escaped from shallow Middle Jurassic Xishanyao Formation reservoirs because of the absent Lower Cretaceous regional seal rocks and faults up to the ground.Fortunately,the Permian-Lower Jurassic petroleum reservoirs remained under the protection of the Lower-Middle Jurassic sealing beds.

Key words: Characteristics of hydrocarbon, Hydrocarbon accumulation, Qigu Oil Field, Southern Junggar Basin

CLC Number: 

  • TE122.1+2
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