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首页> 外文会议>International Symposium of the Society of Core Analysts >NMR RELAXIVITY GROUPING OR NMR FACIES IDENTIFICATION IS KEY TO EFFECTIVE INTEGRATION OF CORE NUCLEAR MAGNETIC RESONANCE DATA WITH WIRELINE LOG
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NMR RELAXIVITY GROUPING OR NMR FACIES IDENTIFICATION IS KEY TO EFFECTIVE INTEGRATION OF CORE NUCLEAR MAGNETIC RESONANCE DATA WITH WIRELINE LOG

机译：NMR松弛率分组或NMR相表识别是有效地集成核心核磁共振数据与有线日志的关键

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Interpretation of nuclear magnetic resonance(NMR)logs is challenged by the following three factors:(1)incorrect critical transverse relaxation time(T2)cutoff for free fluid index(2)incorrect permeability model and(3)effect of unusual relaxation properties of the rock.Some of these challenges can be addressed through the use of NMR core spectrometry data for log calibration.However,further difficulty lies in the application of the NMR core data to correctly calibrate wireline NMR logs.In this work,we demonstrate that identification and delineation of NMR”relaxivity groups”or”NMR facies”are critical in the application of laboratory NMR calibration data to log analysis.We define NMR facies or relaxivity groups as units in the reservoir that have similar NMR relaxation characteristics.Hence,NMR relaxation characteristics such as T2 cutoff and relaxivity constant can be averaged within each relaxivity group.The method presented also allows direct application of laboratory based models for log interpretation irrespective of tool dependent factors like logging speed,borehole conditions,fluid types and saturation.Relaxivity group concept encompasses the following:(1)the fundamental physics of the behavior of the magnetic dipole of hydrogen nuclei in the presence of an applied(external)magnetic field,(2)the mathematical relationship between the relaxation rates of magnetization,the pore size that contain the liquid and other surface properties of the porous media,and(3)the mineralogical attributes of the rock formation.Therefore,combined influence of mineralogical and textural attributes on relaxation rate is captured.Delineation of this group is based on NMR porosity and normalized median value of the relaxation time.These data can be obtained directly from wireline NMR log measurements.The validity and applicability of the methodology is demonstrated by a regional study involving measurement of NMR transverse relaxation time constant(T2)on about 400 plugs,and mineralogical,textural and pore size attributes on selected samples.This work provides a sound basis for tool calibration and enhanced interpretation of NMR wireline log output and also an effective algorithm for permeability determination.
机译：对核磁共振（NMR）原木的解释受到以下三种因素的挑战：（1）自由流体指数（2）不正确的渗透性模型和（3）异常松弛性能的临界横向松弛时间（T2）截止值不正确摇滚这些挑战可以通过使用NMR核心光谱测定数据来解决用于日志校准。但是，在应用NMR核心数据的情况下，进一步的困难是正确校准有线NMR Logs.in这项工作，我们证明了识别和NMR“松弛率组”或“NMR相位”的描绘对于实验室NMR校准数据的应用至对数分析至关重要。我们将NMR相或放松率定义为具有类似NMR弛豫特性的储层中的单元。，NMR弛豫特性例如T2截止和放松恒定可以在每个放松率组内平均。所提供的方法还允许直接应用基于实验室的模型L og解释，无论测井速度，钻孔条件，流体类型和饱和等刀具相关因素如何.Lelaxivity组概念包括以下内容：（1）在施加的氢核的磁性偶极子行为的基本物理学（外部）磁场，（2）磁化的弛豫率之间的数学关系，含有多孔介质的液体和其他表面性质的孔径，以及（3）岩层的矿物学属性。因此，综合影响捕获放松率的矿物学和纹理属性。该组的提示是基于NMR孔隙度和归一化的放松时间的中值值。这些数据可以直接从有线NMR日志测量获得。方法是证明了方法的有效性和适用性涉及测量NMR横向松弛时间常数（T2）的区域研究，以及矿物学选定样本上的纹理和孔径属性。这项工作为刀具校准提供了一种合理的基础，并提高了NMR电缆对数输出的解释，也是一种有效的渗透测定算法。

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