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Petroleum Geology Acronyms


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Neutron Phi Lime Matrix (NLIM)

This is the name of a log measured along a well bore (a well-log). You might have encountered this acronym NLIM in your log evaluation software or any (ASCII) log files provided by the logging company. Neutron Phi Lime Matrix is the full name for this log. This log is often used in the industry.

This log displays readings of the porosity derived from a neutron logging measurement, assuming that the rock matrix material is calcite.

So basically this is a measure of 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. 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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