Although the seismic log and VSP velocity are accuracy, but determined velocity data of Wells on sections are little and insufficient to control the horizontal change of velocity.

Well log constrained seismic inversion is usually applied at the evaluation stage, which may provide abundant geological evidences for evaluating well placement and the proved reserves.

With consideration of the effects of phase characteristics, direct component and digital truncation, a method for extracting wavelet near a well by using seismic and log data is proposed.