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bed thickness effects

density, neutron plots

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NEUTRON SOURCE EFFECTS

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IMPROVED GENERATOR POROSITY MEASUREMENTS

Gram-Schmidt Orthonorm.

Van Cittert Deconvolution

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NEUTRON SOURCE EFFECTS IN WELL LOGGING


In this section of the website, the origins of micro geophysical modeling are touched upon and four LVFPM OUTPUTS - fast neutron slowing down length (Ls), thermal neutron diffusion coefficient (D), thermal neutron diffusion length (L), and thermal neutron capture cross section (SIGMA) - are seen in their native habitat.


Figure 1, taken from US Patent 3,906,224 and a full copy, are provided below. This Figure forms the starting point for a discussion of the effects that different neutron sources and their energies and modes of operation have on nuclear well logging tools.


Figure 2 was generated by LVFPM: it forms the basis for a novel way to measure neutron porosity with a neutron generator-based logging tool that has both good porosity measurement sensitivity and good count rates. The genesis of this method is US Patent 3,818,225 and a copy is also provided below. The main idea is to directly measure the thermal neutron diffusion coefficient and then use the relationships shown in Figure 2 to obtain neutron porosity.


 
Figure 1:(See US Patent 3,906,224)
  Document
US Patent 3,906.224
Document
Figure 2: Porosity versus Thermal Neutron Diffusion Coefficient
  Document
US Patent 3,818,225
  Document
Neutron Source Energy Effects
 

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KUT, capture & inelastic gamma spectroscopy using Gram-Schmidt Orthonormalization. Porosity, density, SIGMA via MCNP6 & classic modeling. Open-hole density via MCNP6.