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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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Neutron Porosity Time Since Drilled, Transmitted (NPEX) |
This is an abbreviation for a well log used in the oil and gas industry. The code NPEX is a unique identifier to recognize this particular log and can be found in any (ASCII) log files provided by the logging company. The code stands for 'Neutron Porosity Time Since Drilled, Transmitted'. The usage of this log is well established. This log displays readings of the time delay between the drill bit and a neutron sensor reaching a given point in the wellbore during MWD/LWD logging. In general this log thus reflects units of the delay time. This can be explained as being the time difference by which one event lags another. In refraction seismic work, the additional time required to traverse a raypath over the time which would be required to traverse the horizontal component at the highest velocity encountered on the raypath.This log usually has the unit 'Time (seconds)'. Note: This log is transmitted to surface during logging.Data from this log can be used to investigate the time interval of the formation. Similar logs are listed below:
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