Lithologic Reservoirs ›› 2023, Vol. 35 ›› Issue (3): 40-50.doi: 10.12108/yxyqc.20230304

• PETROLEUM EXPLORATION • Previous Articles     Next Articles

Nonlinear seepage characteristics of shale oil reservoirs of the third member of Paleogene Shahejie Formation in Qikou Sag，Bohai Bay Basin

ZENG Xu1,2, BIAN Congsheng1, SHEN Rui1, ZHOU Kejia2, LIU Wei1, ZHOU Suyan3, WANG Xiaoluan3   

  1. 1. PetroChina Research Institute of Petroleum Exploration & Development, Beijing 100083, China;
    2. China University of Petroleum(Beijing), Beijing 102249, China;
    3. PetroChina Dagang Oilfield Company, Tianjin 300280, China
  • Received:2022-05-09 Revised:2022-07-20 Published:2023-04-25

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Abstract: Through high-pressure mercury injection and low-temperature gas adsorption experiments， combined with nuclear magnetic resonance online detection system and displacement experiment，the seepage characteristics of shale oil reservoirs of the third member of Paleogene Shahejie Formation（Es3）in Qikou Sag， Bohai Bay Basin were studied. The results show that： （1）The micropores of the three lithofacies shales of the third member of Paleogene Shehejie Formation in Qikou Sag account for the largest proportion. Compared with massive mudstone，the medium and large pore throats with pore diameter greater than 100 nm in laminated and layered shale reservoirs are more developed，and the reservoir properties and seepage capacity are better.（2）The flowable oil that occurs in the large pore throats of shale reservoirs can be output effectively， but the oil in the small pore throats（less than 100 nm）is difficult to output even under a large pressure difference due to the large seepage resistance.（3）The seepage of shale oil in shale reservoir has the characteristics of start-up pressure gradient and nonlinear seepage，but there are great differences among different lithofacies. The laminated shale reservoir has the lowest pseudo start-up pressure gradient and the strongest seepage capacity，the layered shale reservoir has a certain seepage capacity，while the massive shale reservoir has the poorest seepage capacity. Under the same pressure gradient，the flow rate in the massive shale is only about 10% of that in laminated shale，and there is no natural productivity.

Key words: shale oil, start-up pressure gradient, nonlinear seepage, seepage capacity, the third member of Shahejie Formation, Paleogene, Qikou Sag, Bohai Bay Basin

CLC Number: 

  • TE122.2
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