In borehole seismic, wavefield separation is an important issue which has great influence on data imaging. In this paper, we present a modified linear Radon transform to deal with the upgoing and downgoing wavefield separation. On the basis of the frequency-domain linear Radon transform, this method is implemented by introducing a new variable λ and the reflection wavefield separation is done in λ - f domain instead of p - f domain. What'more, the theory of high resolution Radon transform is introduced. With the application of this method, significant improvement in accuracy and computational efficiency can be obtained in wavefield separation. Examples from the synthetic data and real borehole seismic data (both VSP data and cross-well seismic data) verify this method is feasible and valid.
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