Timing and character mismatches between borehole and surface seismic are often encountered when correlating and calibrating seismic data. Even after block shifts are applied, a good match at shallow depths can gradually deteriorate into a mis-tie of up to 20 msec in the target area. Once events have been correlated in a single well this mis-tie is often at tributed to well deviation or poor migration of the surface data. These time variant misdes pose a critical problem when a large number of wells are examined in a workstation environment. For example, wavelet matches appear to be time variant and the translation of physical parameters from one data set to the other will be wrong: In a number of cases inelastic absorption has proved to be the cause; compensation of this Q effect has provided a solution, often with the added benefit of improved vertical resolution.


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