Abstract:

The characteristics of seismic response from the heterogeneous Ordovician fractured-vuggy carbonate reservoirs in Tahe oilfield are complicated.However,the forward modelling technique can be used to simulate the characteristics of seismic wave propagating through this kind of reservoirs and provide a theoretical principle for fractured-vuggy reservoir prediction.With drilling data from the southern part of Tahe oilfield,different random cavity-medium models were established through threshold truncation and continuous random perturbation modes. Seismic well-tie sections were also used in the construction of the seismic-geologic model that works better in simulating the real karst fractured-vuggy carbonate reservoirs.Pseudo zero offset section and stacked migration section were obtained through forward modelling of seismic wave field in heterogeneous medium.On these bases, the seismic response characteristics of fractured-vuggy carbonate reservoirs were summarized.

Key words: characteristic of seismic response, forward modelling, fractured-vuggy reservoir, Tahe oilfield