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Petroleum Geology Acronyms


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Enhanced Thermal Neutron Porosity in Selected Lithology (NPOR)

This is the name of a log measured along a well bore (a well-log). The code NPOR is a unique identifier to recognize this particular log and can be found in any (ASCII) log files provided by the logging company. The acronym stands for 'Enhanced Thermal Neutron Porosity in Selected Lithology'. The business value of this log is often deamed high.

Use this log to investigate the porosity as measured with a thermal neutron logging device.

Simply said, this is a log that describes the porosity as measured with an neutron logging device. At a higher level, this can be seen as a measure of the apparent porosity. This can be explained as being 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. Better said, 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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