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Petroleum Geology Acronyms

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Smoothed Neutron Porosity (LS, SS, or DOL) With Temperature and Pressure Corrections Applied (NTCP)

This is an abbreviation for a well log acquired after or during drilling. The acronym NTCP can be found in any (ASCII) log files provided by the logging company. Smoothed Neutron Porosity (LS, SS, or DOL) With Temperature and Pressure Corrections Applied is the full name for this log. This log is often used in the industry.

This log helps to evaluate the porosity as measured with an neutron logging device. In general this log therefore displays units of the apparent porosity. Better said, 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 more general level these values are measures of the volume fraction. This is a measure of 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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