Abstract: Because the fractured reservoirs have outstanding resource potential and economic benefits, fine quantitative characterization on fractured reservoirs using seismic methods is becoming one of the key tasks of exploration geophysics. To overcome the disadvantages of the conventional methods of data driven inversion which cannot acquire fracture parameters directly, and of the model driven inversion method based on the static equivalent medium theory which cannot characterize the internal pore structure and fluid information, we propose a quantitative reservoir characterization method based on a dynamic equivalent media model. The method establishes the objective function using frequency-dependent AVO theory and uses a global optimization algorithm to estimate fracture parameters. Through applying our method to 1D and 2D models, we can confirm that, by taking full advantage of the sensitivity of frequency-dependent response of the reflection coefficient to the fracture density and time scale factor, the inversion algorithm can effectively characterize the fractured reservoir.

Key words: fractured reservoirs, frequency-dependent AVO inversion, dynamic equivalent medium model, fractured reservoirs characterization