Abstract: With the development of the theory on oil reservoir description, the studies on the distribution of fluid properties and geochemical models have become an important part of reservoir description. In this paper, the case studies were taken from the heavy viscous oil pools in the 1,2,3 sections of the Shahejia Fr. in the Lengdong-Leijia Region. Furthermore, the authors established a 3-D geochemical model with a computer by using Kriging technology on the basis of comprehensive analysis on physical and geochemical properties of fluid and the distribution model of fluid properties. Finally, a complete set of techniques for establishing a geochemical model was summarized in the paper.