Abstract: Due to the high heterogeneity of fracture-cavity type carbonate reservoir, it is difficult to build reservoir model effectively with the traditional method of combining well data and geological layers. However, the conventional seismic attributes extraction means can not be integrated with log data to describe reservoir quantitatively. In order to apply seismic data to quantitative reservoir modeling research, in this study, the correlation between log P-wave impedance and total porosity is built on the basis of clear correspondence between various seismic reflections and fine interpretation of the top horizon of reservoir, and geostatistical inversion is carried out to calculatemulti-high-resolution P-wave impedance volume. Using the statistical relationship between P-wave impedance and total porosity to co-simulate can calculate multi-equivalent porosity volume. Equivalent porosity volume integrates the scale of log and seismic information very well, and can be used for the quantitative description study of fracture-cavity type carbonate reservoir spacial heterogeneity. This study provides ideas and methods for quantitative reservoir description in fracture-cavity carbonate reservoirs with seismic inversion technique.

Key words: seismic inversion, equivalent porosity model, geostatistical inversion, quantitative description, Tabei Uplift