2D Magnetic Resonance eXpert (MRX) logging is used to identify weak gas responses of low-impedance and low-permeability reservoir. Three interpretations are dicussed based on the working principle and advantages of 2D MRX. Longitudinal relaxation T1 spectrum is effective for identifying low-grade gas while radial relaxation (T1 or T2)-diffusion coefficient (D) 2D image intersection method can directly judge fluid properties, and average pore size may help us to analyse the formation mechanism of low-impedance gas. Research shows that the fluid changing data of mud invasion profile are obtained by contrast of 2D NMR measurements data at different depths, and this provides more accurate reservoir fluid property information. Logging interpretation is carried out based on the 2D NMR information of a gas field in South China Sea, and the interpretation results are in accordance with the oil tests.%介绍二维核磁共振测井仪器(MRX)工作原理和优势.论述了二维核磁共振测井资料在低电阻率低渗透率储层流体性质判别上的应用.利用二维核磁共振径向弛豫(T1或T2)与扩散系数(D)二维图像交会图法判识低电阻率低渗透率储层流体性质更加直观,有助于分析低电阻率气层成因机理；其平均孔径大小定量计算成果比一维核磁区间孔隙度评估更加适合于地质应用；对南海某气田低电阻率低渗透率储层二维核磁共振资料应用实例进行了分析,测井解释结果与地层取样结论一致.
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