低渗透储层岩石核磁共振特性实验分析与测井评价研究

发布时间：2018-07-01 15:20

本文选题：低渗透储层 + 核磁共振　；参考：《中国石油大学(华东)》2015年硕士论文

【摘要】：在众多测井方法中,核磁共振测井因其能提供与储层性质及产能有关的孔隙度、渗透率、孔隙结构、自由流体和束缚流体体积等参数而得到广泛应用,在低孔低渗储层、薄层评价和复杂油藏流体识别等方面显示出了其独特的优势,为解决油田勘探开发中各种复杂地质问题提供了新思路,成为必不可少的重要测井手段。本文针对低渗透储层岩心,开展实验室岩心核磁共振实验,研究低渗透储层岩心核磁共振信号特点及其影响因素,在理论分析的基础上结合岩心核磁共振实验结果,对研究区开展核磁共振测前设计及储层评价研究。针对区域低渗透储层岩心特点,从核磁共振理论基础出发,开展不同共振频率、不同流体性质、不同采集参数下的低渗透储层岩心核磁共振实验。结果表明,岩心核磁共振T2谱受仪器频率、回波间隔TE、等待时间TW、孔隙流体性质等因素的影响,并且不同的岩性受影响的程度不同。研究了P型核磁共振测井仪器的采集模式、应用条件,结合区域储层地质特点和岩心实验结果,进行测前设计,优选测井模式与采集参数。在实验室核磁共振岩心分析的基础上,研究T2截止值与T2谱特征参数的关系,建立了基于可变T2截止值的核磁共振测井储层参数计算模型,弥补了单一T2截止值在不同井段,不同岩性条件下适应性较差的缺点,取得了较好的应用效果。从岩石孔隙结构的分形特征出发,并结合渗流场与电流场的耦合性及Brooks-Corey/Burdine模型,建立流体相对渗透率与核磁共振横向弛豫时间的关系,研究基于分形和岩心核磁共振的流体相对渗透率计算方法。在孔隙结构评价方面,利用T2分布,结合压汞资料,对核磁共振T2谱分别进行线性和非线性转换,通过对比,优选转换方法,并利用三孔隙度组分百分比法对孔隙结构进行识别和分类。
[Abstract]:Among many logging methods, nuclear magnetic resonance logging has been widely used in low porosity and low permeability reservoirs due to its ability to provide parameters such as porosity, permeability, pore structure, free fluid and bound fluid volume related to reservoir properties and productivity. Thin layer evaluation and fluid identification of complex reservoirs show their unique advantages, which provide a new way to solve various complex geological problems in oil field exploration and development, and become an indispensable and important logging tool. In this paper, the nuclear magnetic resonance (NMR) experiment in laboratory is carried out for low permeability reservoir cores. The characteristics of nuclear magnetic resonance signals in low permeability reservoirs and their influencing factors are studied. Based on the theoretical analysis, the results of nuclear magnetic resonance (NMR) experiments in cores are combined. The pre-NMR design and reservoir evaluation were carried out in the study area. According to the core characteristics of regional low permeability reservoir, the nuclear magnetic resonance experiments of low permeability reservoir cores with different resonance frequencies, different fluid properties and different acquisition parameters are carried out on the basis of nuclear magnetic resonance (NMR) theory. The results show that the T _ 2 spectrum of core is affected by the instrument frequency, echo interval, waiting time, pore fluid properties and so on, and different lithology is affected to different extent. The acquisition mode and application conditions of P-type nuclear magnetic resonance logging tool are studied. Combined with regional reservoir geological characteristics and core experimental results, pre-logging design is carried out to select logging model and acquisition parameters. On the basis of nuclear magnetic resonance core analysis in laboratory, the relationship between T 2 cutoff value and T 2 spectrum characteristic parameters is studied, and a model for calculating reservoir parameters of nuclear magnetic resonance logging based on variable T 2 cutoff value is established, which makes up for the single T 2 cut-off value in different well segments. The disadvantages of poor adaptability under different lithologic conditions have achieved good application results. Based on the fractal characteristics of rock pore structure and the coupling of seepage field and current field and Brooks-Corey / Burdine model, the relationship between the relative permeability of fluid and the transverse relaxation time of nuclear magnetic resonance (NMR) is established. The calculation method of fluid relative permeability based on fractal and nuclear magnetic resonance (NMR) is studied. In the evaluation of pore structure, using T2 distribution and mercury injection data, the NMR T2 spectra were converted linearly and non-linear respectively. The pore structure is identified and classified by the three-porosity fraction percentage method.
【学位授予单位】：中国石油大学(华东)
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：P631.81

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