Cycle Skipping In Sonic Log

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Last updated 03 Aug, 2021
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https://en.wikipedia.org/wiki/Sonic_logging

Sonic logging is a well logging tool that provides a formation’s interval transit time, designated as , which is a measure of a formation’s capacity to transmit seismic waves.Geologically, this capacity varies with lithology and rock textures, most notably decreasing with an increasing effective porosity.This means that a sonic log can be used to calculate the porosity of a formation if ...

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https://spec2000.net/22-fracloc4.htm

fracture LOCATION FROM SONIC LOGS ... Sonic log cycle skips may indicate fractures. ... Cycle skipping is more common on long spaced than on short spaced sonic logs in hard formations, because of lower sound amplitude on longer tools. The reverse is often true in softer sands and shales, due to rock alteration near the wellbore.

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https://spec2000.net/07-soniclog.htm

At left, the log shows cycle skips (shaded red) probably caused by low amplitude signal due to fractures. Unshaded black curve is probably valid. red curve is sonic log from adjacent well, possibly with lower porosity. At right, a good sonic log with no cycle skips, showing how to read log values in thin beds. ARRAY SONIC LOGS

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https://glossary.oilfield.slb.com/en/Terms/c/cycle_skip.aspx

cycle skip English Español: 1. ... An anomalously high transit time in a log, such as a continuous velocity log, observable as a spike on the log, commonly caused by the presence of fractures, gas, unconsolidated formations, aerated drilling mud and enlarged boreholes.

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http://petrofaq.org/wiki/Cycle_skipping

Cycle skipping: In sonic logging, if the first arrival (first cycle) is not identified, due to weak signal, usually through bad borehole geometry (washouts), later cycles will be picked, giving erroneous travel times.

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http://homepages.see.leeds.ac.uk/~earpwjg/PG_EN/CD%20Contents/GGL-66565%20Petrophysics%20English/Chapter%2016.PDF

The sonic or acoustic log measures the travel time of an elastic wave through the formation. This information can also be used to derive the velocity of elastic waves through the formation. Its main use is to provide information to support and calibrate seismic data and to derive the porosity

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