Abstract: According to the features of seismic data in study area, the technical study of large-scale merging pre-stack time migration (PSTM) is made and the signal-to-noise ratio of pre-stack is improved. The techniques of amplitude adjustment in time-frequency-space domain, amplitude normalization, signature shaping and space-variant deconvolution are developed to improve imaging quality and lateral resolution. The above techniques are applied to 13 blocks, which realize seamless joint of the data, of which 25 favorable traps with an area of 301.6 km2 have been found and determined in four major blocks and 17 exploratory wells have been designed and arranged.

Key words: residual static correction, multi-domain combining noise attenuation, multi-wave suppression, amplitude normalization, pre-stack time migration