The analysis of two reservoir parameters' influence on AVO intercept-gradient cross-plot

AVO Intercept-Gradient cross-plot Analysis technique is an complex art of detecting natural gas and clean oil based on the inversion of hydrocarbons, which can intuitively analysis the change law of the two facultative attribute factors to predict petroleum and gas. In this paper, based on the Shuey approximate formulas as a simplified of the full form of the Zoeppritz equation, we extracted the models' angle gathers, made P-G Cross-plot of AVO, compared and anlaysised the impact of reservoir thickness and Poisson's ratio on the P-G Cross-plot. When we did research on the impact of reservoir thickness, we chose appropriate thickness according to Widess graphic, making the different models have good contrast, and we achieved good results. © 2012 ejge.