Oilfield Glossary
Oilfield Glossary
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Tools

1. n. [Geophysics]
The delay or difference in the arrival time of seismic events that can result from weathering of the rocks or variations in geologic structures in the subsurface.
2. n. [Geophysics]
A term used in seismic processing to describe the interval between the zero-time of a crosscorrelation between two traces and the point of maximum correlation.
3. n. [Geophysics]
The time delay of the onset of one sinusoidal oscillation, or frequency component of a trace, relative to another. Also known as a "phase-lag."
See: sinusoid
4. n. [Formation Evaluation]
The distance between the static measure point and the dynamic measure point of a logging measurement. For nuclear logs and any others that must be recorded over a significant time period, there is a difference between the measure point with the tool stationary and moving. If the tool is moving during this period, the effective center of measurement will be a certain distance from the point at which the measurement started. This distance is the lag. The lag depends on the logging speed and the sampling interval.