Application of frequency extension processing technology in the prediction of meandering channel sand body

In recent years, the J99 well area in the western slope of Songliao Basin has obtained high production oil flow in S1 channel, which indicates that the channel sand body of this layer has a good exploration prospect. The channel plane distribution in this area is characterized by meandering river channel, the average thickness of reservoir is 4-6m, and the reservoir has the characteristics of high porosity and high permeability. However, due to the low resolution of seismic data, the seismic response of sand body is mostly characterized by weak amplitude and the channel boundary features are not obvious, which reduces the accuracy of channel boundary characterization. In this paper, based on the different frequency bands forward modeling analysis of sand body, clear the influence of seismic frequency band response to wave group characteristics, and then use spectrum blueing frequency extension processing technology, optimization of high frequency and low frequency energy distribution, after the extension frequency processing, reflection inside channel sand body and the boundary wave group feature more clear, greatly improving the for S1 river horizontal well drilling results.