松辽盆地青山口组页岩油储层孔隙结构对渗吸特征影响

doi:10.3969/j.issn.1006-6535.2025.03.011

摘要/Abstract

摘要： 为精细分析松辽盆地古龙凹陷青山口组页岩油储层优势岩相孔隙结构与渗吸特征的联系,在系统分析该区3种岩相页岩岩性和物性参数的基础上,开展高压压汞、低压氮气吸附、增压渗吸吞吐和核磁共振扫描联测实验,研究了不同岩相页岩孔隙结构特征对渗吸规律的影响。结果表明:松辽盆地青山口组长英质纹层页岩、富有机质黏土质纹层页岩和黏土质纹层页岩的孔隙结构参数依次呈现亚微米级孔隙体积减小、分选系数降低、排驱压力与饱和中值压力升高的变化规律;长英质纹层页岩具有与渗吸采收率关系密切的孔隙结构特征优势,第1周期渗吸采收率和总体采收率均最高;富有机质黏土质纹层页岩和黏土质纹层页岩的纳米级孔隙体积大,采用增大渗吸吞吐压差和增加渗吸吞吐轮次的方式,可以提高渗吸采收率。研究结果可为页岩油渗吸开发提供技术支撑。

关键词: 页岩油, 孔隙结构, 渗吸, 岩相, 核磁共振

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

中图分类号:

TE135

陈鸿安, 付兰清. 松辽盆地青山口组页岩油储层孔隙结构对渗吸特征影响[J]. 特种油气藏, 2025, 32(3): 94-103.

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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