录井工程 ›› 2023, Vol. 34 ›› Issue (2): 1-8.doi: 10.3969/j.issn.1672-9803.2023.02.001

• 工艺技术 •    下一篇

基于核磁共振T2谱的致密砂岩孔喉分布评价方法

屈凯旋①, 李国良①, 于春勇②, 赵全国①, 段传丽①, 房金伟①   

  1. ①中国石油渤海钻探油气合作开发分公司;
    ②中国石油渤海钻探第一录井公司
  • 收稿日期:2023-04-19 出版日期:2023-06-25 发布日期:2023-07-12
  • 作者简介:屈凯旋 工程师,1993年生,博士,2022年毕业于中国地质大学（北京）矿产普查与勘探专业,现在中国石油渤海钻探油气合作开发分公司从事地质综合研究工作。通信地址：300457 天津市开发区第二大街83号（中国石油天津大厦）。电话：18811170326。E-mail：qukaixuan@cnpc.com.cn
  • 基金资助:
    中国石油渤海钻探工程公司重大工艺项目“苏里格气田西区富集成藏配置与渗透砂岩储层改造技术一体化研究”子课题“苏里格气田西区构造-岩性复合气藏富集成因机理与储层流体性质识别技术研究”（编号：2023ZD19Y-01）

Evaluation method of pore throat distribution in tight sandstones based on NMR T2 spectrum

QU Kaixuan①, LI Guoliang①, YU Chunyong, ZHAO Quanguo①, DUAN Chuanli①, FANG Jinwei①   

  1. ①Oil & Gas Cooperation and Development Company, BHDC, CNPC, Tianjin 300457,China;
    ②No.1 Mud Logging Company, BHDC, CNPC, Tianjin 300280, China
  • Received:2023-04-19 Online:2023-06-25 Published:2023-07-12

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摘要： 利用核磁共振技术估算孔喉分布的关键在于准确确定弛豫时间与孔喉半径之间的转换方法,常规的线性关系转换方法拟合效果较差,而幂函数转换方法是经验公式,无法通过数学关系推导得出,两种方法都具有一定的缺陷。因此,基于Korringa-Seevers-Torrey模型,结合核磁共振原理推导出了弛豫时间T2谱与孔喉半径的理论关系,并建立了相应的计算模型,所有的模型参数都具有严格的物理意义。以南华北盆地太原组致密砂岩样品为例,对推导公式的准确性进行了验证。考虑到不同大小孔隙的表面弛豫率具有差异性,利用推导公式模型对致密砂岩的孔喉半径分布范围分段进行了拟合,结果显示,采用新方法拟合弛豫时间与孔喉半径数据的效果极佳,拟合决定系数均在0.89以上,说明新方法的准确性极高。此外,基于新方法获得了致密砂岩储层核磁共振孔喉半径分布,并确定了与可动流体分布对应的孔喉半径下限范围。该方法不仅有效提升了核磁共振孔喉半径分布的转换精度,也为利用核磁共振技术定量表征致密砂岩储层的孔隙结构特征提供了可靠的工具。

关键词: 致密砂岩, 核磁共振, 孔喉半径, 可动流体, 弛豫时间

Abstract: Accurate determination of the conversion method between relaxation time and pore throat radius is the crucial for estimating pore throat distribution by using NMR technique. However, the conventional linear relation conversion method has poor fitting results, and the power function conversion method is an empirical formula, which cannot be derived from the mathematical relations, both of them have certain limitations in practical use. The theoretical relationship between the relaxation time T2 spectrum and the pore throat radius was derived based on the Korringa-Seevers-Torrey model in conjunction with NMR principles, the corresponding computational model was developed,and all model parameters had strict physical meanings. The accuracy of the derived equation was verified using the tight sandstone samples from the Taiyuan Formation in the Southern North China Basin as examples. Considering the variability of surface relaxivity of pores with different diameters, the derived equation model was used to fit the pore throat radius distribution of tight sandstones in order of segmentation. The new method has excellent results in fitting the relaxation time to the pore throat radius, with determination coefficient above 0.89, indicating the high accuracy of the new method. In addition, based on the new method, the NMR pore throat radius distribution of tight sandstone reservoirs was obtained, and the lower limit range of pore throat radius corresponding to the movable fluid distribution was determined.This method not only effectively improves the accuracy of converting NMR T2 distribution into pore throat radius distribution, but also provides a reliable tool for quantitative characterization of the pore structure of tight sandstone reservoirs using NMR technique.

Key words: tight sandstone, NMR, pore throat radius, movable fluid, relaxation time

中图分类号: 

  • TE132.1
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