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Petroleum Geology Acronyms


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Total CMR Porosity (TCMR)

This is the name of a log measured along a well bore (a well-log). The acronym TCMR can be found in any (ASCII) log files provided by the logging company. The abreviatin stands for 'Total CMR Porosity'. This log is often used in the industry.

This log displays readings of the apparent formation porosity as measured with an nuclear magnetic logging device. At a more general level these values are measures 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. At a higher level, this can be seen as a measure 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 nmr logging technique and can be used to investigate the porosity of the formation. Similar logs are listed below:




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