Lithologic Reservoirs ›› 2025, Vol. 37 ›› Issue (6): 140-150.doi: 10.12108/yxyqc.20250613

• PETROLEUM EXPLORATION • Previous Articles    

Seismic prediction technology for complex network fractures in fault-fracture reservoir of tight sandstones: A case study of Triassic Xujiahe Formation in northern Sichuan Basin

MIAO Zhiwei1, LI Shikai1,2, ZHANG Wenjun1, XIAO Wei1, LIU Ming1, YU Tong1   

  1. 1. Exploration Company, Sinopec, Chengdu 610041, China;
    2. College of Geophysics, Chengdu University of Technology, Chengdu 610059, China
  • Received:2025-01-14 Revised:2025-03-10 Published:2025-11-07

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Abstract: Through a"three-step"complex network fracture seismic comprehensive prediction technology, the seismic quantitative prediction of fracture development intensity and scale in different orientations and phases of the tight sandstone"fault-fracture body"reservoir of Xujiahe Formation in northern Sichuan Basin was carried out.The results show that: (1) The technical workflow of seismic prediction is as follows: Utilize high-resolution frequency-division ant tracking based on deconvolution generalized S-transform, to predict fracture phases and orientations by constructing a discrete grid model. Establish QVAZ equation for azimuthal attenuation elastic impedance based on the theory of attenuation anisotropy, and combine group sparse inversion to achieve prestack quantitative prediction of fracture density. Integrating the above two technologies for complementary advantages and overlapping analysis, complete the spatial description of complex network fractures.(2) The fractures in the "fault-fracture body" tight sandstone reservoir of Triassic Xujiahe Formation in Tongjiang area of northern Sichuan Basin mainly develop near faults, and their direction align with fault trends. These fractures are mainly of tectonic origin, local anticlines strata display relatively stable development. The tensional fractures associated with the folding process are not the sweet spots of the "fault-fracture body"reservoir, but the intersection of multiple large-scale fractures is a favorable area for the development of complex network fractures.(3) This method can perform high-definition identification of low sequence level faults, reducing the impact of low signal-to-noise ratio and lithological mutations in complex structural areas, avoiding the false appearance of fractures that may be caused by local stratigraphic folds, reducing the dependence of traditional methods on seismic data signal-to-noise ratio, and predicted interlayer micro-fractures with high resolution. The predicted results are in good agreement with the FMI interpretation and testing productivity of actual drilling. Based on this method, the newly deployed well M15 obtained industrial gas flow of 10.35×104 m3/d in the fourth member of Xujiahe Formation during gas testing.

Key words: “fault-fracture body” reservoir, tight sandstone, complex network fracture, anisotropy, time-frequency analysis, seismic inversion, ant tracking, Xujiahe Formation, Triassic, northern Sichuan Basin

CLC Number: 

  • TE122
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