Lithologic Reservoirs ›› 2025, Vol. 37 ›› Issue (5): 111-121.doi: 10.12108/yxyqc.20250510

• PETROLEUM EXPLORATION • Previous Articles    

Structural-lithologic trap types and main controlling factors of hydrocarbon accumulation of Cretaceous in Longhupao Oilfield，Songliao Basin

ZHANG Yunfeng1, SHI Xiaodong2, LIU Zongbao3, YANG Xuewei4, WANG Hongjun2, HAO Bin5   

  1. 1. College of Petroleum Engineering, Liaoning Petrochemical University, Fushun 113001, Liaoning, China;
    2. No. 9 Oil Production Plant, PetroChina Daqing Oilfield Co., Ltd., Daqing 163853, Heilongjiang, China;
    3. College of Earth Sciences, Northeast Petroleum University, Daqing 163318, Heilongjiang, China;
    4. No. 5 Oil Production Plant, PetroChina Daqing Oilfield Co., Ltd., Daqing 163513, Heilongjiang, China;
    5. PetroChina Research Institute of Petroleum Exploration & Development-Northwest, Lanzhou 730020, China
  • Received:2024-12-04 Revised:2025-03-18 Published:2025-09-06

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Abstract: Based on structural characteristics and sand body geometry features，the structural-lithologic trap types of Cretaceous in Longhupao Oilfield of Songliao Basin were identified and classified by utilizing data from rock cores，master logging，well logging，and production dynamics. The main controlling factors for reservoir formation were studied from three aspects，such as source rock conditions，oil source transport fault，and the relationship between structure and sand body configuration. Oil and gas accumulation models of different types of traps were summarized. The results show that：（1）Cretaceous structural-lithologic traps in Longhupao Oilfield are mainly developed in Putaohua oil layer，with three microfacies ，such as underwater distributary channels，estuary bar，and front sheet sands，which maintain the characteristics of thin and narrow sand bodies in the delta front subfacies controlled by the northern source.（2）The structural-lithologic traps in the study area can be divided into three categories：fault-lithologic traps in the western slope zone，nose shaped structural-lithologic traps in the eastern nose shaped structural zone，and fault-nose shaped structural-lithologic traps in the central subsag zone. They can be further subdivided into eight subtypes：fault-strip sand type，fault-sheet sand type， fault-lens sand type，nose shaped structural-strip sand type，nose shaped structural-sheet sand type，nose shaped structural-lens sand type，fault nose-strip sand type，and fault nose-sheet sand type.（3）The formation of structural-lithologic traps in the study area is jointly controlled by“source-fault-reservoir-potential”. Source rocks from the first member of Qingshankou Formation provide sufficient oil and gas resources，oil source faults serve as vertical migration pathways for oil and gas，and the relationship between structure and sand body configuration controls the enrichment of oil and gas within traps.（4）There are three types of structural-lithologic trap accumulation models developed in the study area：fault-lithologic trap accumulation model of“vertical transport of oil source faults and enrichment of favorable sedimentary microfacies”，nose shaped structure-lithologic trap accumulation model of“lateral transport of sand bodies and enrichment of positive structures”，and faultnose shaped structure-lithologic trap accumulation model of“fault and sand composite transport，and enrichment of connected sand bodies or thick sand bodies”.

Key words: structural-lithologic trap, nose shaped structure, oil source fault, delta front subfacies, Cretaceous, Longhupao Oilfield, Songliao Basin

CLC Number: 

  • TE122.2
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