Lithologic Reservoirs ›› 2021, Vol. 33 ›› Issue (6): 48-58.doi: 10.12108/yxyqc.20210606

• PETROLEUM GEOLOGY • Previous Articles     Next Articles

Characteristics of delta front progradation structure of Yanchang Formation in Longdong area,Ordos Basin

FENG Xue1, GAO Shengli1,2, LIU Yongtao3, WANG Xiuzhen3   

  1. 1. School of Earth Sciences and Engineering, Xi'an Shiyou University, Xi'an 710065, China;
    2. Key Laboratory of Shaanxi Province for Oil and Gas Accumulation Geology, Xi'an 710065, China;
    3. Changqing Branch, Geophysical Research Institute, BGP, CNPC, Xi'an 710021, China
  • Received:2021-04-25 Revised:2021-06-30 Online:2021-12-01 Published:2021-11-25

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Abstract: In order to overcome the multiplicity of 2D seismic data in complex structures and the uncertainty of sand body prediction, based on the division of sedimentary facies zones, the 2D and 3D seismic data were interpreted in detail by using the method of migration trajectory and progradational configuration, and the sand body distribution of Yanchang Formation in Longdong area was predicted. The results show that there are four types of progradational configuration of Yanchang Formation in the study area. (1) S-type lenticular progradation has a flat or slightly upward migration path, with top deposit, delta front subfacies and mudstone at the bottom of the lake. (2) S-type wedge-shaped progradation has a flat to descending migration path, with thick basement, and delta sandstone and turbidite are developed. (3) Tangential oblique plate-shaped progradation has a descending migration path, with top and bottom layers, and delta front and turbidite fan are developed. (4) Parallel oblique wedge-shaped progradation has a flat migration path, without top and bottom beds, and delta sandstone and sandy clastic rocks are developed. S-type wedge-shaped progradation and tangential oblique plate-shaped progradation are delta turbidite fan systems, which are favorable directions for lithologic reservoir exploration.

Key words: migration trajectory, seismic sedimentology, delta front, deep water deposition, slope topography, Yanchang Formation, Ordos Basin

CLC Number: 

  • TE122.1
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