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Petroleum Geology Acronyms


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Partial porosities from MRIL (PORID)

This is the name of a log measured along a well bore (a well-log). You could have found the code PORID in your log evaluation software or your corporate datastores. The abreviatin stands for 'Partial porosities from MRIL'. The usage of this log is well established.

This log helps to evaluate the contribution of porosity from a given "bin" (with certain characteristics) to the total porosity; e.g., in nuclear magnetic resonance data processing, the "bins" typically correspond to different pore size ranges. In general this is a measurement 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.

Simply said, this is a log that describes the pore volume per unit gross volume. Porosity is determined from measurements on cores or interpreted from logs. In general this log therefore displays units 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.

Data for this log is produced by a tool that uses a nmr logging technique and can be used to investigate the porosity of the formation. Similar logs are listed below:







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