Lithologic Reservoirs ›› 2022, Vol. 34 ›› Issue (1): 106-117.doi: 10.12108/yxyqc.20220111

• EXPLORATION TECHNOLOGY • Previous Articles     Next Articles

Relationship between pore structure and oil production capacity of low permeability sandstone: A case study of block F154 in south slope of Dongying Sag

HE Xian1,2, YAN Jianping1,2,3, WANG Min4, WANG Jun4, GENG Bin4, LI Zhipeng4, ZHONG Guanghai5, ZHANG Ruixiang2   

  1. 1. State Key Laboratory of Oil & Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu 610500, China;
    2. School of Geoscience and Technology, Southwest Petroleum University, Chengdu 610500, China;
    3. Key Laboratory of Tectonics and Petroleum Resources, China University of Geosciences, Ministry of Education, Wuhan 430074, China;
    4. Research Institute of Exploration and Development, Sinopec Shengli Oilfield Company, Dongying 257015, Shandong, China;
    5. Research Institute of Shale Gas, PetroChina Southwest Oil & Gas Field Company, Chengdu 610500, China
  • Received:2021-02-01 Revised:2021-05-31 Online:2022-01-01 Published:2022-01-21

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Abstract: The sandstone reservoirs of Shahejie Formation(Es3) in block F154 in the south slope of Dongying Sag are characterized by low permeability, complex pore structure and difficulty in productivity prediction. The pore structure characteristics and controlling factors were analyzed by using the data of core physical property test with overburden pressure,casting thin section,constant-rate mercury injection,high pressure mercury injection and X-ray diffraction. Based on the production data,the parameter of oil production intensity was obtained to represent the productivity. Relationships between pore structure parameters and oil production intensity were analyzed,and the pore structures were classified. The oil production intensity was calibrated to the logging curve through the identification of pore structure types. A multi-parameter oil production intensity prediction model was established based on sensitive logging variables,and verified with the data of actual wells. The results show that the number of large throats determines the permeability. The larger the oil production intensity,the better the pore structure. The intervals of pore structure with high oil production intensity usually have low natural gamma, high acoustic time difference,deep resistivity and deep and shallow resistivity difference. The correlation coefficient between the actual and the predicted oil production intensity is greater than 0.9,and the calculated results meet the requirements of production prediction. The research results provide a basis for the productivity prediction of low permeability sandstone reservoirs with complex pore structure.

Key words: low permeability sandstone, pore structure, productivity prediction, oil production intensity, sensi tive logging curve, Shahejie Formation, Dongying Sag

CLC Number: 

  • P631
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