松辽盆地青山口组页岩油储层孔隙结构对渗吸特征影响

陈鸿安; 付兰清

doi:10.3969/j.issn.1006-6535.2025.03.011

特种油气藏 >

2025 , Vol. 32 >Issue 3: 94 - 103

DOI: https://doi.org/10.3969/j.issn.1006-6535.2025.03.011

油藏工程

松辽盆地青山口组页岩油储层孔隙结构对渗吸特征影响

陈鸿安 ,
付兰清

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1.中国石油大庆油田有限责任公司,黑龙江大庆 163712;
2.多资源协同陆相页岩油绿色开采全国重点实验室,黑龙江大庆 163002;
3.黑龙江省油层物理与渗流力学重点实验室,黑龙江大庆 163712

陈鸿安(1989—),女,工程师,2012年毕业于东北石油大学勘察技术与工程专业,2015年毕业于该校地球探测与信息技术专业,获硕士学位,现主要从事非常规油气藏评价方面的研究工作。

收稿日期: 2024-01-02

修回日期: 2025-02-01

网络出版日期: 2025-07-08

基金资助

中国石油重大专项“大庆古龙页岩油勘探开发理论与关键技术研究”(2021ZZ10);黑龙江省“百千万”工程科技重大专项“松辽盆地北部古龙页岩油成藏条件及“甜点”分布规律研究”(SC2020ZX05A0023)

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

CHEN Hongan ,
FU Lanqing

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1. PetroChina Daqing Oilfield Co.,Ltd.,Daqing,Heilongjiang 163712,China;
2. State Key Laboratory of Continental Shale Oil,Daqing,Heilongjiang 163002,China;
3. Heilongjiang Provincial Key Laboratory for Oil Formation Physics and Seepage Mechanics,Daqing,Heilongjiang 163712,China

Received date: 2024-01-02

Revised date: 2025-02-01

Online published: 2025-07-08

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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

本文引用格式

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 . DOI: 10.3969/j.issn.1006-6535.2025.03.011

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

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