Abstract：Due to a special temperature-pressure environment and forming mechanism,the heavy oil density is very close to the water density,which makes seismic response characteristics of heavy oil reservoirs very similar to that of water-bearing strata.Hence heavy oil reservoirs are very difficult to be identified with AVO.For this purpose,we propose a new petrophysical property analysis method for heavy oil reservoirs based on AVO sensitive factors.Firstly,after rock physics analysis based on Zoeppritz-equation and Biot-Gassmann theory,the relationships between reflection coefficient and petrophysical property (porosity),and reflection coefficients and oil-gas possibility (oil saturation) are established with rock elastic parameters.The influences of oil saturation and porosity on AVO characteristics of heavy oil reservoirs are then successively analyzed by the integration of fluid substitution,porosity substitution,and AVO forward modeling.Results indicate that the porosity is the major sensitive factor of AVO characteristics while the influence of oil saturation is negligible.Finally,this method is applied to the Jinzhou-A Oilfield,the lateral variation of porosity within targets is analyzed,and the result is consistent with drilling data,which confirms the effectiveness of the proposed method.
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