核磁共振储层物性参数评价方法

发布时间：2018-03-04 19:14

本文选题：核磁共振　切入点：T2谱　出处：《东北石油大学》2015年硕士论文　论文类型：学位论文

【摘要】：岩心分析是确定储层参数最基础、最准确的手段。随着近几年开采难度加大以及致密油气田研究的兴起,针对孔隙结构复杂、非均质性强的岩心,常规方法越来越不能满足测量需要。核磁共振作为较有潜力的新方法,通过少次测量即可得到渗透率、孔隙分布、含油饱和度等储层物性参数,不仅在应用时具有便捷快速无损的优点,而且受影响因素小,精度较高,可以应对各种状态的储层预测。本文结合实验室核磁共振岩心分析研究核磁共振评价储层物性参数的方法。在保持其他实验条件不变的情况下,研究回波间隔对孔隙度测量的影响,最终针对不同渗透率岩心确定回波间隔设定范围,提高核磁孔隙度测量精度。结合地区岩心常规分析资料,通过数值拟合确定核磁渗透率模型SDR和Coates模型中的待定系数,并由实验数据分析来评价这两种渗透率模型在该地区的适用性。结合岩心油驱水实验,提出利用岩心完全饱和水状态和饱和油束缚水状态的T2谱确定T2截止值的新方法,同时进行核磁共振(T2-D)二维谱测量和离心实验来验证该实验方法求取束缚水饱和度的可靠性。针对T2谱与毛管压力曲线的良好对应关系,提出一种整体转换伪毛管压力曲线的矩阵方法。通过实验研究最终得到评价储层孔隙度、渗透率、束缚水饱和度及伪毛管压力曲线等储层物性参数的方法。
[Abstract]:Core analysis is the most basic and accurate means to determine reservoir parameters. With the increasing difficulty of exploitation and the rise of research on tight oil and gas fields in recent years, the core with complex pore structure and strong heterogeneity, Nuclear magnetic resonance (NMR), as a potential new method, can obtain reservoir physical parameters such as permeability, pore distribution, oil saturation and so on. It not only has the advantages of convenient, fast and lossless in application, but also has the advantages of small influence factors and high precision. This paper studies the method of evaluating reservoir physical parameters by nuclear magnetic resonance (NMR) in combination with laboratory nuclear magnetic resonance core analysis. Under the condition of keeping other experimental conditions unchanged, The effect of echo interval on porosity measurement is studied. Finally, the range of echo interval is determined for cores with different permeability, and the accuracy of nuclear magnetic porosity measurement is improved. The undetermined coefficients in SDR and Coates models are determined by numerical fitting, and the applicability of these two permeability models in this area is evaluated by the analysis of experimental data. A new method for determining the T _ 2 cutoff value by using the T _ 2 spectrum of the fully saturated water state and the saturated oil bound water state of the core is proposed. At the same time, T2-D NMR measurements and centrifugation experiments were carried out to verify the reliability of the proposed method for obtaining irreducible water saturation. A matrix method for integral transformation of pseudo-capillary pressure curves is proposed, and a method for evaluating reservoir physical parameters such as reservoir porosity, permeability, irreducible water saturation and pseudo-capillary pressure curve is obtained through experimental research.
【学位授予单位】：东北石油大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：P618.13

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