Fluid identification method and application of pre-stack and post-stack integration based on seismic low-frequency

Seismic low-frequency component included more fluid information, which was still a focus in geophysics. Seismic pre-stack data contained more fluid information, but signal to noise ratio (SNR) was low. By comparison, seismic post-stack data had a high SNR, but some fluid information was lost during data processing. Different angel stacks reflected different fluid seismic amplitude, compared with near-angle stacks. Far angle stacks had more low frequency components, which were more benefit for fluid identification. Based on this principle, combined with the pre-stacks and post-stacks seismic data, more fluid information would be included. In this study, a new fluid identification method was proposed. This method combined the post-stack seismic and pre-stack seismic data, it took into consideration high SNR of the post-stack seismic data and the large fluid amplitude differences of the pre-stack different angles. Field testing indicated this method was quite effective in detecting fluids.