Lithologic Reservoirs ›› 2025, Vol. 37 ›› Issue (4): 105-114.doi: 10.12108/yxyqc.20250410

• PETROLEUM EXPLORATION • Previous Articles    

Fault development characteristics and controlling on hydrocarbon accumulation of medium-shallow layers in Yuzijing area of southern Songliao Basin,NE China

ZHANG Ziwei1, LIU Junqiao1, LI Jiaona1, HU Xinlei1, WU Hao1,2, LYU Yanfang1, JIANG Fei1   

  1. 1. College of Earth Sciences, Northeast Petroleum University, Daqing 163318, Heilongjiang, China;
    2. Geophysical Exploration Research Institute of PetroChina Jilin Oilfield, Songyuan 138000, Jilin, China
  • Received:2025-02-17 Revised:2025-03-27 Published:2025-07-05

Abstract: Petroleum resources in southern Songliao Basin mainly distribute in oil-bearing series in mediumshallow layers,and faults are the primary migration pathways for vertical multiple layers hydrocarbon enrichment. Fault development characteristics and their controlling on medium-shallow layers of southern Songliao Basin was studied based on 3D seismic interpretation,drilling analysis data and distribution characteristics of oil and gas reservoirs. The results show that: (1) During the fault-depression stage of Songliao Basin , the faults exhibit large-scale and tense activity,mainly composed of tensional normal faults. The internal structural style of the fault intensive zone in the depression stage inherits the basic pattern of the fault-depression stage,profiles appear V-shaped and stepped ,showing typical characteristics of tension and torsion. During the inversion stage, intense folding,uplifts,and tectonic inversion were generated,and reverse faults were developed. Oil-source faults can be classified as segmented growth fault and through-going fault.(2)Hydrocarbon migration through faults includes four forms: vertically upward along the fault,vertically downward along the fault(backflow transport),crossing the fault plane(lateral transport),and along the fault direction. In Fuyu oil layer, hydrocarbon migration is dominated by lateral transport and backflow transport,controlled by the fault-displaced formation thickness and sand to mud ratio.Lateral transport forms FⅠ and FⅡ oil group in upper Fuyu oil layer,with minority hydrocarbon transported to FⅢ oil group. Backflow transport is suitable for segmented growth oil-source faults,controlling hydrocarbon distribution across all four oil groups of Fuyu oil layer(. 3) In Gaotaizi oil layer and Putaohua oil layer,hydrocarbon migration is dominated by upward and lateral transport. The oil layers formed by upward transport widely distribute,while the oil layers formed by lateral transport mainly distribute within the fault zone.

Key words: oil-source fault, upward transport, backflow transport, lateral transport, Fuyu oil layer, Gaotaizi oil layer, Putaohua oil layer, medium-shallow layer, Yuzijing area, southern Songliao Basin

CLC Number: 

  • TE122.1+2
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