Impact of pore structure on imbibition characteristics in Qingshankou Formation shale oil reservoirs,Songliao Basin

doi:10.3969/j.issn.1006-6535.2025.03.011

Abstract

Abstract: To analyze the relationship between pore structure and imbibition characteristics in favorable lithofacies of the Qingshankou Formation shale oil reservoirs in the Gulong Sag,Songliao Basin,a comprehensive experimental study was conducted.Based on systematic analysis of lithological and physical properties of three typical lithofacies,integrated experimental methods including high-pressure mercury intrusion,low-pressure nitrogen adsorption,pressurized imbibition and huff-n-puff testing,and nuclear magnetic resonance scanning were employed to investigate how pore structure characteristics affect imbibition behavior across different lithofacies.The results show that the pore structure parameters of the feldspathic laminated shale,organic-rich clayey laminated shale,and clayey laminated shale in the Qingshankou Formation of the Songliao Basin exhibit a consistent trend:decreased submicron-level pore volume,reduced sorting coefficient,and increased displacement pressure and median pressure.The feldspathic laminated shale has pore structure advantages closely related to imbibition recovery,with the highest first-cycle and overall recovery rates.The organic-rich clayey laminated shale and clayey laminated shale have large nano-pore volumes.Increasing the imbibition-huff-n-puff pressure difference and the number of imbibition-huff-n-puff cycles can boost recovery.The research findings can offer a technical basis for shale oil imbibition development.

Key words: shale oil, pore structure, imbibition, lithofacies, nuclear magnetic resonance

CLC Number:

TE135

CHEN Hongan, FU Lanqing. Impact of pore structure on imbibition characteristics in Qingshankou Formation shale oil reservoirs,Songliao Basin[J]. Special Oil & Gas Reservoirs, 2025, 32(3): 94-103.

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