Question

Difference between density and litho density tools

Answer 1

the measurement of the mean atomic number (litho-density tool), which is a new generation of density tool that provides additional lithology information, through the measurement of the photoelectric cross-section and an improved density measurement. When a gamma ray of low energy (below 100 keV) interacts with an electron, it is totally absorbed. Because of the smaller long spacing and more efficient detectors and electronics, the statistical variations are significantly reduced. For the photoelectric absorption index, the fundamental factor is the mean atomic number of the bulk formation. The barite effect correction on the density measurement can be done because the gamma-ray spectrum is known. For the photoelectric absorption index, the borehole generally has a very small influence because of the fact that the tool is on a pad.

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