Prediction Method of Fractured Carbonate Reservoirs Based on Diffracted Wave Separation and Seismic Attributes

In Ordovician carbonate reservoirs in the northern Tarim Basin, fracture cavities developed along faults and rivers provide storage spaces for oil and gas. The identification of faults, river channels, and fracture cavities is the key to fracture carbonate reservoirs. The seismic response of the fracture cavities exhibits complex diffraction wave. In conventional seismic data (full wave data), diffracted wave has weak energy and is submerged in strong energy reflected wave, which need to be separated. We propose a prediction method of fractured carbonate reservoirs using diffracted wave separation and seismic attributes. Based on plane wave destructive filter and mean filter, we predict reflected wave and separate diffracted wave from full wave data. The coherence attribute and coherent energy gradient attribute are respectively applied to test the identification ability of faults, river channels, and fracture cavities. The application of field data shows that the proposed method can effectively identify faults, river channels, and fracture cavities. It has reference significance for the actual production of fractured carbonate reservoirs.