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Petroleum Geology Acronyms


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Field Normalized CNC (CNCF)

This is a log of measurements along a well bore (a well-log). The acronym CNCF can be found in any (ASCII) log files provided by the logging company. The acronym stands for 'Field Normalized CNC'. This log is often used in the industry.

The values of this log represent the porosity as measured with an neutron logging device.

In general this log thus reflects units of the apparent porosity. In other words, the initial estimate of porosity, normally from logs, not corrected for the (often large) effects of clays, gas, etc. Such estimates should only be used for qualitative interpretation of clean, gas-free intervals. At a higher level, this can be seen as a measure of the volume fraction. This can be explained as being the ratio of the volumes occupied by two components, or by one component to the total volume of the system.

This log usually has the unit 'Porosity'. This is the pore volume per unit gross volume. Porosity is determined from measurements on cores or interpreted from logs.

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




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