Lithologic Reservoirs ›› 2025, Vol. 37 ›› Issue (2): 189-200.doi: 10.12108/yxyqc.20250217

• PETROLEUM EXPLORATION • Previous Articles    

Seismic sedimentology characteristics of the second member of Sinian Dengying Formation in Penglai area, north-central Sichuan Basin

ZHANG Kun1,2,3, LIU Hong1,2,3, TAN Lei1,2,3, LIANG Feng4, WANG Lien4, MA Zike5, LIU Bowen5, YANG Mengxiang1,3   

  1. 1. Sichuan Natural Gas Geology Key Laboratory, Southwest Petroleum University, Chengdu 610500, China;
    2. State Key Laboratory of Oil and Gas Reservoir Geology and Exploration, Southwest Petroleum University, Chengdu 610500, China;
    3. CNPC Key Laboratory of Carbonate Reservoirs Southwest Petroleum University Division, Chengdu 610500, China;
    4. North Central Sichuan Gas Production Management Office, PetroChina Southwest Oil and Gas Field Company, Suining 629000;
    5. Chuanzhong Division of PetroChina Southwest Oil & Gasfield Conpany, CNPC, Suining 629000, Sichuan, China
  • Received:2024-04-10 Revised:2024-06-23 Published:2025-03-06

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Abstract: In order to clarify the temporal and spatial distribution of the mound-shoal complex of the second member of Dengying Formation（Deng 2 member for short）in Penglai area and explore the application of seismic sedimentology in carbonate rocks，the mound-shoal complex of Deng 2 member in Penglai area were identified and characterized by seismic sedimentology techniques such as paleogeomorphology restoration，forward modeling，waveform clustering and attribute fusion based on drilling，core，logging and 3D seismic data. The results show that：（1）During the sedimentary period of Deng 2 member，Penglai area is characterized by carbonate platform deposition，and can be subdivided into four sedimentary subfacies：mound-shoal complex，intershoal sea，platform flat and restricted lagoon.（2）Through fine seismic-lithologic calibration，a good correspondence between seismic facies and sedimentary facies is established. The high-energy mound-shoal complex face is characterized by low-amplitude mound-like shape，internal disorder or intermittent-weak intermittent reflection，and bright spot reflection in the inner core. PCA multi-attribute fusion technology based on seismic facies constraints can effectively improve the recognition accuracy of mound-shoal complex.（3）The distribution of mound-shoal complex in the Deng 2 member has the characteristics of differentiation zone. The mound-shoal complex in the SQ1 sedimentary period of the Moxi area are more developed than those in the Penglai area. Until SQ2 sedimentary period，the development scale of the mound-shoal in the Penglai area has become larger，and the moundshoal complex core microfacies have a wide range of development. The Moxi area is dominated by platform sediments，and the mound-shoal complex are only sporadically developed in local areas.

Key words: mound-shoal complex, seismic sedimentology, multi-attribute analysis, low-amplitude mound-like shape, disorder reflection, bright spot reflection, second member of Dengying Formation, Sinian, Penglai area, Sichuan Basin

CLC Number: 

  • TE122.1
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