Lithologic Reservoirs ›› 2022, Vol. 34 ›› Issue (5): 100-109.doi: 10.12108/yxyqc.20220508

• PETROLEUM EXPLORATION • Previous Articles     Next Articles

Sedimentary characteristics and reservoir control of beach bar in faulted lake basin:A case study of Cretaceous Tongbomiao Formation in Tanan Sag

SUI Liwei1, YANG Wenlu1,2, LI Junhui1, FAN Xiaodong1, JIANG Hongfu3, WEN Quan1, ZHANG Dazhi1, YUAN Yong1   

  1. 1. Research Institute of Exploration and Development, PetroChina Daqing Oilfield Company Limited, Daqing 163712, Heilongjiang, China;
    2. Heilongjiang Provincial Key Laboratory of Reservoir Physics & Fluid Mechanics in Porous Medium, Daqing 163712, Heilongjiang, China;
    3. International Exploration and Development Company, PetroChina Daqing Oilfield Company Limited, Daqing 163153, Heilongjiang, China
  • Received:2021-12-18 Revised:2022-03-10 Online:2022-09-01 Published:2022-09-06

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Abstract: Based on core observation,well logging analysis and seismic interpretation data,the sedimentary characteristics,distribution law and reservoir accumulation model of beach bar sand bodies of Cretaceous Tongbomiao Formation in Tanan Sag were studied. The results show that:(1)the beach bar microfacies of Cretaceous Tongbomiao Formation in Tanan Sag can be divided into beach sand and bar sand according to lithology and sedimentary structural characteristics,and there are three sedimentary assemblages,including beach bar symbiosis, beach without bar and bar without beach. Beach bar symbiotic assemblage is developed in the western gentle slope zone of Tanan Sag,beach without bar assemblage is developed in the eastern steep slope zone and the concave bank of lake shoreline,and bar without beach assemblage is developed in underwater paleouplift and convex bank of lake shoreline.(2)The development characteristics and distribution law of beach bar are mainly controlled by ancient landform,ancient water depth and ancient wind direction. The paleogeomorphology of the slope zone and underwater central uplift zone in the sag controls the sedimentary range of beach bar. The NE trending ancient wind field controls the beach bar to be distributed in the NE direction along the lake shoreline on the plane. The difference of ancient water depth between the eastern and western sub depressions controls the sedimentary properties and thickness of beach bar.(3)Beach bar reservoir formation in Tanan Sag mainly includes internal accumulation of "source reservoir symbiosis" and lateral accumulation of "source reservoir connection". The internal accumulation of "source reservoir symbiosis" mainly forms lithologic reservoirs,which are mainly developed in the near source sag belt of the eastern sub-depression,and the potential area is near source sag. The lateral accumulation of "source reservoir connection" mainly forms structural lithologic reservoirs,which are mainly developed in the western slope zone,and the potential area is in the reverse fault step zone.

Key words: faulted lake basin, beach bar deposit, hydrocarbon accumulation model, reservoir control, source reservoir symbiosis, source reservoir lateral connection, Tongbomiao Formation, Cretaceous, Tanan Sag

CLC Number: 

  • TE122.2
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