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Welcome to Petroleum Geology Forums
This is a free online community that aims to bring petroleum professionals and geologists together and share valuable knowledge. Registration is easy so become a member now for instant free access.
- Petroleum Geologists can stay up to date with industry related topics and exchange ideas and concepts.
- Upstream Oil and Gas Consultants get a chance to share their expertise and gain exposure to land future projects.
- Geology students and graduates can join the discussion and get into contact with potential future employees.
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Petroleum Geology AcronymsBrowse through the Acronyms using the letters above or search for the acronym or it's description using the form below. If you have a acronym or abbreviation you would like to see in this list please contact us.
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Thermal Neutron Porosity (TNPA) |
This is an abbreviation for a well log acquired after or during drilling. You could have found the code TNPA in your log evaluation software or your corporate datastores. Thermal Neutron Porosity is the full name for this log. This log is very common in the industry. The values of this log represent the porosity as measured with a thermal neutron logging device. Concluding, this is a measure of the porosity as measured with an neutron logging device. At a higher level, this can be seen as a measure of the apparent porosity. Better said, 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 log therefore displays units 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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