112 Well seismic surveying and acoustic logging poor cementation between the casing and the formation. The measured acoustic velocity represents the formation velocity for times under 70 ms. However, the correlation coefficient between the seismic trace and the synthetic seismogram at the intersection point is greater than 0.7, showing a good tying of the seismic horizons in the time interval 38-60 ms. It falls to 0.5 if we consider the interval 38-80 ms. a b c d Figure 4.6 Seismic section and synthetic seismogram before “block shift”; a: velocity log and cementation log in depth; b: velocity log and cementation log in time; c: reflectivity before and after frequency filtering; d: raw tying in time of the seismic section with frequency filtered reflectivity. c
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