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Petroleum Geology Acronyms

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Coherence Value at Stoneley Peak (COST)

This is a well log used in the oil and gas industry. You might have encountered this acronym COST in your log evaluation software or any (ASCII) log files provided by the logging company. Coherence Value at Stoneley Peak is the full name for this log. This log is not often acquired after (or during) drilling a well.

This log helps to evaluate the measure of waveform coherence with respect to slowness and time, computed as a function of coherent energy to total energy; also called "Semblance"

Concluding, this is a measure of the similarity between two or more functions; used with seismic waveforms to distinguish seismic events and to implement automatic picking schemes.

This log in unitless. Either the log measurements can not be expressed with a unit (eg. a ratio) or the unit is unknown to us.

Data for this log is produced by a tool that uses a acoustic logging technique and can be used to investigate the acoustic slowness of the formation. Similar logs are listed below:

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