Gamma ray logging is a method of measuring naturally occurring gamma radiation to characterize the rock or sediment in a borehole or drill hole. It is...

The formation evaluation gamma ray log is a record of the variation with depth of the natural radioactivity of earth materials in a wellbore. Measurement...

or drill pipe) BHC – BHC gamma ray log[clarification needed] BHCA – BHC acoustic log[clarification needed] BHCS – BHC sonic log[clarification needed] BHCT...

gamma ray log, measuring the natural radioactivity, was introduced by Well Surveys Inc. in 1939, and the WSI neutron log came in 1941. The gamma ray log...

porosity logs and sonic logs. The two main nuclear porosity logs are the Density and the Neutron log. Density logging tools contain a caesium-137 gamma ray source...

out ) d log ⁡ ( V in ) . {\displaystyle \gamma ={\frac {\mathrm {d} \log(V_{\text{out}})}{\mathrm {d} \log(V_{\text{in}})}}.} That is, gamma can be visualized...

log types such as SP, resistivity, porosity, and gamma ray logs are discussed in detail by Asquith and Gibson (1982). ... A spontaneous potential log...

of the 2-ray model is formally a special case with ν = 4 {\displaystyle \nu =4} : P L = P t d B m − P r d B m = 40 log 10 ⁡ ( d ) − 10 log 10 ⁡ ( G h...

emits medium-energy gamma rays into the formation. Radioactive sources are typically a directional Cs-137 source. These gamma rays interact with electrons...

well. There are two categories of well log data: the original data (e.g. Gamma Ray log as a result of gamma rays measurements in the borehole, through...