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Petroleum Geology Acronyms

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Epithermal Neutron Porosity (ENPH)

This is a well log used in the oil and gas industry. You might have encountered this acronym ENPH in your log evaluation software or any (ASCII) log files provided by the logging company. The full name for this log used in the industry is 'Epithermal Neutron Porosity'. The business value of this log is often deamed high.

This log displays readings of the porosity as measured with an epithermal neutron device.

Simply said, this is a log that describes 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. In general this is a measurement 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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