Lithologic Reservoirs ›› 2023, Vol. 35 ›› Issue (5): 92-99.doi: 10.12108/yxyqc.20230509

• PETROLEUM EXPLORATION • Previous Articles    

Fine characterization of reservoir units of Paleogene Shahejie Formation in Langgu Sag，Bohai Bay Basin

HU Wangshui1,2, GAO Feiyue1,2, LI Ming3, GUO Zhijie4, WANG Shichao4, LI Xiangming1,2, LI Shengming5, JIE Qiong6   

  1. 1. College of Earth Sciences, Yangtze University, Wuhan 430100, China;
    2. Key Laboratory of Exploration Technologies for Oil and Gas Resources, Ministry of Education, Yangtze University, Wuhan 430100, China;
    3. Jianghan Oil Production Plant, Sinopec Jianghan Oilfield Company, Qianjiang 433128, Hubei, China;
    4. Department of Development, PetroChina Huabei Oilfield Company, Renqiu 062552, Hebei, China;
    5. Research Institute of Exploration and Development, PetroChina Huabei Oilfield Company, Renqiu 062552, Hebei, China;
    6. No. 4 Oil Production Plant, PetroChina Huabei Oilfield Company, Langfang 065000, Hebei, China
  • Received:2023-02-08 Revised:2023-08-22 Published:2023-09-28

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Abstract: Based on data of core facies，logging facies and rock fragment analysis，the microstructure，reservoir unit types and oil-water connectivity of Paleogene Shahejie Formation in Langgu Sag of Bohai Bay Basin were studied using a point-line-surface representation method. The results show that：（1）The Paleogene Shahejie Formation in Langgu Sag mainly has two types of reservoir units，namley，structural reservoir units and “fault sand configuration” reservoir units. There are six，five，three and two reservoir units in No. 1 to No. 4 sublayers of Es4-Ⅰ sand group in An 11 well area，respectively. There are five reservoir units in both No. 3 and No. 7 sublayers of Es3-Ⅱ sand group in An 22 well area，while the number of reservoir units in other sublayers varies.（2）The reservoir units of the upper Es4-Ⅰ sand group in An 11 well area have high connectivity of sand bodies and fluids， while the reservoir units of middle Es3 in An 22 well area have complex types，complex distribution，high sand body connectivity and relatively low fluid connectivity.（3）After implementing the reservoir units as development units，the daily crude oil production of each sublayer in An 11 and An 22 well area has increased. Fine characterization of reservoir units is favorable for indentifing the rolling evaluation objectives in exploration and development，and it also can determine accurate reservoir thickness，reservoir boundaries and reservoir distribution range for the calibration of dynamic reserves and economically recoverable reserves during the development process.

Key words: microstructure, sedimentary microfacies, sand body connectivity degree, structural reservoir unit, “fault sand configuration” reservoir unit, Shahejie Formation, Paleogene, Langgu Sag, Bohai Bay Basin

CLC Number: 

  • TE122.1
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