Lithologic Reservoirs ›› 2024, Vol. 36 ›› Issue (3): 96-105.doi: 10.12108/yxyqc.20240309

• PETROLEUM EXPLORATION • Previous Articles    

Discovery and exploration enlightenment of Carboniferous volcanic condensate gas reservoirs in western well Pen-1 sag，Junggar Basin

BIAN Baoli1, LIU Hailei1, JIANG Wenlong1, WANG Xueyong1, DING Xiujian2   

  1. 1. Research Institute of Exploration and Development, PetroChina Xinjiang Oilfield Company, Karamay 834000, Xinjiang, China;
    2. School of Geosciences, China University of Petroleum(East China), Qingdao 266580, Shandong, China
  • Received:2023-01-17 Revised:2023-03-17 Published:2024-04-30

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Abstract: Carboniferous volcanic reservoir in Junggar Basin is one of the key fields of oil and gas exploration. Based on logging data, geochemical analysis data and rock thin section identification, combined with geophysical methods, the main controlling factors of Carboniferous volcanic oil and gas accumulation in western well Pen-1 sag in Junggar Basin were clarified, the enrichment rules of deep volcanic reservoirs were summarized, and the favorable exploration directions were defined. The results show that:（1）The source rocks of Fengcheng Formation in western well Pen-1 sag of Junggar Basin are 100-300 m thick and cover an area of about 5 400 km2, and enter the stage of generating condensate oil and dry gas as a whole, with a gas generation intensity greater than 20×108 m3/km2, providing abundant natural gas sources for the sag.（2）The lithologies of the Carboniferous volcanic rocks in the study area are complex, and the andesitic volcanic breccias formed by volcanic eruptions are weathered and leached, which can form weathered crust-type reservoirs with high reservoir properties. The large unconformity between Carboniferous and Permian and widely developed deep and large faults are important transport systems. The mudstones of the upper Urho Formation of Permian serve as a regional cap rock, providing preservation conditions for condensate gas accumulation. Oil reservoirs are mainly developed in high position, while gas reservoirs are developed in low position.（3）Through the“WBH”（wide-azimuth, broadband, and high-density） technology, the accuracy of seismic imaging has been improved, and the timefrequency electromagnetic technology（TFEM）was combined to achieve fine characterization of Carboniferous volcanic rocks, providing a favorable support for the exploration of deep oil and gas reservoirs. The major breakthrough of well Shixi 16 has confirmed the great exploration potential of Carboniferous volcanic rocks in western well Pen-1 sag.

Key words: condensate gas reservoir, volcanic rock, source rock of Fengcheng Formation, mudstone cap rock of upper Urho Formation, unconformity, deep fault, WBH technology, time-frequency electromagnetic technology, Carboniferous, western well Pen-1 sag, Junggar Basin

CLC Number: 

  • TE122.1
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