The vertical seismic profile (VSP) occupies a unique niche in the discipline of reservoir characterization. It provides a level of resolution and a volume of investigation in between those offered by surface seismic data and well logging tools. The relationship between VSP and surface seismic experiments is obvious: The most common use of VSP is in high-resolution reflection imaging and tying surface seismic sections to depth. The relationship between VSP and acoustic well logging is less well explored. Interval velocities from check shot VSP are often used as coarse equivalents of sonic logs, but significant discrepancies are often seen.


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