Abstract: The lateral distribution of the sand body of He-8 segment in Sulige gas field varies quickly, with serious heterogeneity. The use of prestack A VO and inversion technology obtains certain success in this area. The experiment and practice show that the gas-bearing sand body of He-8 segment usually assumes the third type of A VO phenomenon, the Poisson's ratio from prestack parameter inversion is sensitive to the gas-bearing sand body, and the combination use of the intersection of different perspective elastic impedances, S-wave impedance and Poisson's ratio in the prestack inversion can effectively reflect the lithology and fluid characteristics in this area. The lateral distribution pattem of these attributes and elastic parameters is given by cluster analysis, providing the plan consultation basis for well location arrangement in exploration and development.

Key words: Sulige gas field, prestack analysis, inversion, wave impedance, Poisson's ratio