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Some insights on neutron measurements

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1 Author(s)
D. V. Ellis ; Schlumberger-Doll Res., Ridgefield, CT, USA

The basic physics of commercial compensated neutron porosity logging tools is described. Both thermal and epithermal devices are largely controlled by the slowing-down length, which provides an understanding of lithology effects and porosity sensitivity of static measurements. Several codes for computing the slowing-down length from the formation constituents are available. A simple physical model suggests an approximation that may be adequate to determine slowing-down length in many cases. For dynamic measurements the two-detector compensation scheme presents depth matching problems at bed boundaries. Methods exist for treating these problems

Published in:

IEEE Transactions on Nuclear Science  (Volume:37 ,  Issue: 2 )