Abstract: The effectiveness of thin interbed prediction is the main bottleneck restricting the growth of oil production in Songliao Basin. It is confronted with such problems as thin layer, poor property, obscure reservoir disciplines and low predication accuracy of effective reservoir. Study has been conducted on seismic amplitude-preserved processing, resolution enhancement and effective prediction with pre-stack seismic data, and a series of technical achievements have been obtained. A suit of techniques are used to preserve the amplitude in data processing, such as the two-step deconvolution in shot and receiver domain, the anisotropic pre-stack time migration, and the gather regularization, etc. In terms of resolution enhancement, the techniques including the reduction of T2 effect, the enhancement of resolution in pre-stack gathers, the alignment of wavelet stretching in far-middle offset, and the optimization of effective offset distance are used to expand frequency band and reduce interference of thin interbed. In the aspect of prediction with prestack seismic data, the techniques including AVO qualitative reservoir description, quantitative porosity prediction, and pre-stack elastic impedance inversion are used to delineate the thickness of effective reservoir. Through the application of the techniques above, the matching probability of reservoir prediction is higher than 78.5% in Saertu survey

Key words: thin interbed, two-step deconvolution in shot and receiver domain, tuning frequency energy enhancement method, pseudo shear wave reflection ratio, pre-stack elastic impedance inversion, Changyuan Tectonic Belt of Daqing Oilfield