Sharp eyes, interpretation needed to surmount checkshot data errors

William W. GrayThe author has encountered problems with checkshot data many times in a long career.Checkshots are often accepted as a gold standard even after they are shown to be suspect. The cliché is, "Well data are hard data; it's the seismic that's got to be wrong."Many explorers don't check the data, and not checking may cause them to pass up good prospects and sometimes create bad ones.Errors are often obvious, but some can be subtle. Checkshot errors cause targeted horizons to be mispositioned in time, depth (either too high or too low), or surface location. In this article we present some errors as a "wake-up call" to those users who accept checkshots at face val...

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