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Appl Radiat Isot. 2018 Jan;131:83-87. doi: 10.1016/j.apradiso.2017.11.004. Epub 2017 Nov 14.

An approach to derive some simple empirical equations to calibrate nuclear and acoustic well logging tools.

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Exploration Division, Nuclear Materials Authority, B.O: 530 El Maadi, Cairo, Egypt. Electronic address:


A set of three pads was constructed from primary materials (sand, gravel and cement) to calibrate the gamma-gamma density tool. A simple equation was devised to convert the qualitative cps values to quantitative g/cc values. The neutron-neutron porosity tool measures the qualitative cps porosity values. A direct equation was derived to calculate the porosity percentage from the cps porosity values. Cement-bond log illustrates the cement quantities, which surround well pipes. This log needs a difficult process due to the existence of various parameters, such as: drilling well diameter as well as internal diameter, thickness and type of well pipes. An equation was invented to calculate the cement percentage at standard conditions. This equation can be modified according to varying conditions.


Cement bond log; Gamma-Gamma density tool; Neutron-Neutron logs; Porosity reference point 100%

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