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Petroleum Geology Acronyms


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Neutron Porosity Dolomite, Borehole Corrected, Memory (NPDM)

This is the name of a log measured along a well bore (a well-log). You could find this abbreviation NPDM in your log evaluation software or any (ASCII) log files provided by the logging company. Neutron Porosity Dolomite, Borehole Corrected, Memory is the offical name for this log. The business value of this log is often deamed high.

This log helps to evaluate the porosity as measured with an neutron logging device.

In general this log thus reflects units 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 higher level, this can be seen as a measure of the volume fraction. In other words, 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.

Note: This log is kept in the memory of the tool until it is recovered from the well.

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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