页岩油储层孔隙流体的全直径岩心二维核磁共振谱特征及评价方法

doi:10.3969/j.issn.1672-7703.2023.03.011

摘要/Abstract

摘要： 如何客观评价页岩油层中的孔隙流体，准确测量和定量表征页岩油及致密油储层含油饱和度与可动油含量等参数，已经成为当前急需解决的重要技术难题。通过率先在国内引入车载移动式全直径岩心核磁共振测量仪，开展了页岩油岩心现场测试分析和评价研究工作，实现了现场对钻井取心进行连续、高精度、无损的快速核磁共振扫描，弥补了核磁共振测井和室内岩心实验的不足，填补了国内页岩油全直径岩心现场测量技术空白。结合现场岩心描述、其他配套实验数据及试油验证，系统总结出不同流体组分的二维核磁共振T₁—T₂图谱特征，明确了不同孔径中油、水信号的T₁/T₂比值变化规律，建立了基于全直径岩心二维核磁共振谱特征的孔隙流体组分分析方法及识别标准，实现页岩油、致密油及复杂碎屑岩等储层孔隙流体组分准确识别与流体饱和度定量解释。车载移动式全直径岩心二维核磁共振测量技术方法在松辽盆地古龙页岩油、鄂尔多斯盆地长7₃页岩油、河套盆地勘探评价中发挥了重要作用，在大庆、长庆、西南、华北、新疆等致密油气田已规模应用，取得良好效果。

关键词: 全直径岩心, 二维核磁共振, 流体组分, 可动油饱和度

Abstract: How to objectively evaluate the pore fluid in shale oil reservoir and accurately measure and quantitatively characterize parameters such as oil saturation and mobile oil content in shale oil and tight oil reservoirs are key technical problems that need to be solved urgently.The vehicle-mounted mobile full diameter core NMR measurement instrument is firstly introduced in domestic to conduct on-site core testing analysis and shale oil evaluation, which supports to realize the continuous, high-precision, non-destructive and rapid NMR scanning of drilled core on well site, make up for the shortcomings of NMR logging and indoor core experiments, and fill the blank of on-site measurement technology of full diameter shale oil core in China. Based on field core description, other supporting experimental data and well testing verification, the characteristics of 2D NMR T₁-T₂ spectrum of various fluid components are systematically summarized, the change rule of T₁/T₂ ratio of oil and water fluid signals in pores with different diameters is identified, and the pore fluid component analysis method and identification standard are established by using 2D NMR spectrum characteristics of full diameter core, which support to realize the accurate identification of pore fluid components and quantitative interpretation of fluid saturation of shale oil, tight oil and complex clastic rock reservoirs. The technology of vehicle-mounted mobile full diameter core NMR measurement has played an important role in the exploration and evaluation of Gulong shale oil in Songliao Basin, Chang 7₃ shale oil in Ordos Basin, as well as in Hetao Basin, and has widely been applied in tight oil and gas oilfields in Daqing, Changqing, Xinan, Huabei, and Xinjiang oilfields, in which good results have been achieved.

中图分类号:

P631.823

石玉江, 蔡文渊, 刘国强, 袁超, 张伟, 衹淑华, 李思, 王少卿. 页岩油储层孔隙流体的全直径岩心二维核磁共振谱特征及评价方法[J]. 中国石油勘探, 2023, 28(3): 132-144.

Shi Yujiang, Cai Wenyuan, Liu Guoqiang, Yuan Chao, Zhang Wei, Di Shuhua, Li Si, Wang Shaoqing. Full diameter core 2D NMR characteristics of pore fluid in shale oil reservoir and evaluation method[J]. China Petroleum Exploration, 2023, 28(3): 132-144.

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