Lithologic Reservoirs ›› 2023, Vol. 35 ›› Issue (6): 29-36.doi: 10.12108/yxyqc.20230604

• PETROLEUM EXPLORATION • Previous Articles     Next Articles

Accumulation model and favorable area prediction of structural-lithologic composite reservoirs in block W,the slope zone of Oriente Basin,South America

MA Wenjie1, WAGN Jingchun2, TIAN Zuoji3, MA Zhongzhen3, WAN Xuepeng1, LIN Jincheng1, XU Xianglin1, ZHOU Yubing3   

  1. 1. Andes Petroleum Company Limited, Quito 999165, Ecuador;
    2. China National Oil and Gas Exploration and Development Corporation, Beijing 100034, China;
    3. PetroChina Research Institute of Petroleum Exploration & Development, Beijing 100083, China
  • Received:2023-04-24 Revised:2023-05-12 Online:2023-11-01 Published:2023-11-07

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Abstract: Through core observation,seismic interpretation,reservoir inversion,crude oil geochemical analysis,oil-source correlation,and oil and gas migration tracing analysis,the accumulation rules of typical structurallithologic composite reservoirs in block W of the slope zone of Oriente Basin in South America were analyzed,and the further favorable exploration directions were pointed out. The results show that:（1）the structurallithologic composite reservoirs in block W of the slope zone of Oriente Basin are generally characterized by westsouthwest dipping monoclinic structures,with local nose uplifts. The target layer of the oil reservoirs is M1ss member of Cretaceous Napo Formation. The sand bodies are NW-SE trending,with a large reservoir thickness and good physical properties.（2）Reservoir distribution is controlled by the sandbars in estuaries,the NW-SE extends shale belt and stable west-southwest dipping nose uplifts background joint control the trap formation and the spatial distribution of effective oil migration pathway controls reservoir formation.（3）There are three stages for structural-lithologic reservoir formation,including the early conventional crude oil filling stage,the middle stage for crude oil degradation,and late stage of conventional crude oil mixing.（4）The southwest part of the two shale belts in southern area of block W is favorable for structural-lithologic traps.

Key words: structural-lithologic composite reservoirs, accumulation model, slope zone, Cretaceous, foreland basin, Oriente Basin, South America

CLC Number: 

  • TE122.1
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