This article classifies NMR logging fluid identification methods into three: the first is the conventional methods, including DSM, TDA, SSM, DIFAN, EDM and MRIAN; the second is separation of one-dimension spectrum, including MRF, FET, GIFT, MGTE, SIMET; The DSM and TDA use T1 difference to identify fluids and are suitable for reservoirs with light oil and gas. The SSM and DIFAN use fluid diffusion coefficient difference to recognize fluids and are suitable for the reservoirs having medium viscous oil and gas. The MRF, GIFT and SIMET use multi-fluids relaxation models to inverse echo series/signals with multiple different acquisition parameters (e. G. , number of the echo waves, echo intervals and waiting time, etc. ) to get each fluid's saturation and oil viscosity, and the kike. The EDM may determine movable water volume and detect light oil. The last is two-dimension spectrum method, which is a novel method based on the two dimensions such as (T1 ,D)and (T2,D), etc. , and the inversed two dimensional spectrum from this method may visually and effectively identify the reservoir fluids. The basic principle, advantages and applicable conditions of these methods are described and the trend of NMR fluid identification is pointed out.%核磁共振测井流体识别方法分为3类.常规识别方法包括差谱法(DSM)和时域分析方法(TDA),利用流体的纵向弛豫时间T1的差异识别评价流体,适合于含轻质油和天然气储层的识别；移谱法(SSM)和扩散分析法(DIFAN)利用流体扩散系数的差异识别评价流体,适合于含中等黏度油和天然气储层的识别；MRF、GIFT和SIMET方法通过建立储层多流体弛豫模型对多组不同采集参数的回波串进行反演,求得各流体饱和度、原油黏度等；增强扩散法(EDM)能够确定可动水体积和检测轻质油的存在.一维谱分离流体识别方法包括MRF、FET、GIFT、MGTE、SIMET方法,其关键是建立符合实际的多流体弛豫模型以多组不同采集参数的回波串以及研究稳健高效的反演方法.二维谱流体识别方法是基于2个维度如(T2,D)、(T1,D)等进行观测的方法,反演出的二维谱可以直观有效地识别评价储层流体.阐述了这些方法的基本原理、优势特色和适用条件,指出了核磁共振测井流体识别评价方法的发展方向.
展开▼
