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Petroleum Geology Acronyms


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Effective Porosity (Gross) (POR_EFF)

This is a log of measurements along a well bore (a well-log). The acronym POR_EFF is a unique identifier to recognize this particular log and can be encountered in your log evaluation software or your corporate datastores. The official name for this log is 'Effective Porosity (Gross)'. The business value of this log is often deamed high.

Use this log to investigate the porosity available to free fluids, excluding non-connected porosity and space occupied by bound water.

Furthermore, this can be explained by looking at 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.

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 from this log can be used to investigate the porosity of the formation. Similar logs are listed below:




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