Lithologic Reservoirs ›› 2025, Vol. 37 ›› Issue (6): 13-27.doi: 10.12108/yxyqc.20250602

• PETROLEUM EXPLORATION • Previous Articles    

Carboniferous volcanic reservoirs characteristics and favorable area prediction of the eastern Junggar Basin

CHEN Xuan1, XU Xiongfei1,2, ZHANG Hua1,2, GOU Hongguang1, ZHANG Yiting1, YOU Fan1, CHENG Yi1, SUN Yufeng1   

  1. 1. Exploration and Development Research Institute, PetroChina Tuha Oilfield Company, Hami 839009, Xinjiang, China;
    2. College of Geosciences, China University of Petroleum(Beijing), Beijing 102249, China
  • Received:2025-03-17 Revised:2025-04-17 Published:2025-11-07

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Abstract: Using time-frequency electromagnetic method, residual magnetic force, and high-precision 3D seismic data, combined with data from drilling, logging, well testing, and laboratory analysis, Carboniferous volcanic reservoir characteristics of the eastern Junggar Basin were studied. And distribution zones of favorable reservoirs were predicted through numerical model analysis. The results show that: (1) Multiple thrust faults are developed in Carboniferous of the eastern Junggar Basin, presenting an overall tectonic framework of alternating uplifts and sags interconnected by faults. Denudation mostly occurs in the positions of uplifts. Volcanic reservoirs mainly distribute in Jimusar Sag, Jinan Sag, Fukang Sag, and Gucheng Sag. Lithologies are mainly basalt, andesite, rhyolite, and volcanic clastic breccia.(2) Carboniferous volcanic oil and gas reservoirs in the study area are characterized by a fissure-type volcanic eruption mechanism, with dominant lithofacies being explosive facies and effusive facies. The explosive facies mainly distribute in the central area, while the effusive facies mainly distribute in the eastern and northern areas, showing a linear or banded distribution in the plane, which has a good matching relationship with the fault distribution.(3) The development of volcanic reservoirs in the study area is controlled by weathering and leaching, lithofacies assemblage, and fracture development degree, with weathering and leaching being the main factor. The reservoirs are closer to the top interface of Carboniferous, their physical properties are better.(4) The favorable reservoirs in the study area are mainly volcanic breccia of nearvent explosive facies, andesite and basalt of effusive facies, mainly distributed in the western, central, and southeastern parts of the study area. Among them, the physical properties of volcanic reservoirs in the paleogeomorphic high-lying parts and slope zones in the western area are the best.

Key words: volcanic reservoir, explosive facies, effusive facies, volcanic breccia, andesite, basalt, weathering and leaching, weathering index model, Carboniferous, Junggar Basin

CLC Number: 

  • TE122.3
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