Abstract: With the increase of exploration and development in Liaozhong Sag of Bohai Oilfield, the distribution of reservoir fluid revealed is becoming more and more complex, and the identification of reservoir physical properties and fluid is difficult, which puts forward higher requirements for field logging technology and interpretation and evaluation methods. In order to meet the needs of field operation, nuclear magnetic resonance (NMR) logging technology is introduced into Bohai Oilfield. Through the statistical study of nuclear magnetic resonance logging data in Lvda area of Liaozhong Sag, the NMR logging spectrum identification method and characteristic parameter chart method suitable for different fluid types in the reservoir of this area are established. The two methods are mutually verified, which effectively improve the level of rapid and refined evaluation of reservoir fluid properties by comprehensive logging interpretation, provide strong technical support for reservoir fluid interpretation and evaluation, and provide a solid and reliable technical basis for operation and production decision-making.