Resolving the Mixed Salinity Challenges with a Methodology Developed from Pulsed Neutron Capture Gamma Ray Spectral Measurements

2014 ◽  
Author(s):  
Shouxiang Mark Ma ◽  
Harold Pfutzner ◽  
Adbalrasool Abdallah Al Hajari ◽  
Nedal Mohamed Al-musharfi ◽  
Pablo Jose Saldungaray ◽  
...  
Keyword(s):  
Neutron Capture ◽  
Gamma Ray ◽  
Spectral Measurements ◽  
Pulsed Neutron

Improved Pulsed Neutron Capture Logging With Slim Carbon-Oxygen Tools: Methodology

1995 ◽  
Author(s):  
R.E. Plasek ◽  
R.A. Adolph ◽  
C. Stoller ◽  
D.J. Willis ◽  
E.E. Bordon ◽  
...  
Keyword(s):  
Neutron Capture ◽  
Pulsed Neutron

Neutron-capture gamma-ray technique for scale identification inside pipes

Desalination ◽  
1989 ◽  
Vol 75 ◽  
pp. 199-210 ◽  
Author(s):  
Samir Abdul-Majid ◽  
Uthman Dawood
Keyword(s):  
Neutron Capture ◽  
Gamma Ray

Physics, applications, and limitations of borehole neutron-gamma density measurements

Geophysics ◽  
2019 ◽  
Vol 84 (1) ◽  
pp. D39-D56 ◽  
Author(s):  
Mathilde Luycx ◽  
Carlos Torres-Verdín
Keyword(s):  
Environmental Effects ◽  
Gamma Ray ◽  
Vertical Resolution ◽  
Neutron Detectors ◽  
Density Measurements ◽  
Gamma Density ◽  
Limited Applicability ◽  
Empirical Density ◽  
Cesium 137 ◽  
Pulsed Neutron

Radioactive chemical sources can pose security, health, and environmental risks when used to estimate rock porosity in situ. The oil industry has been developing solutions to eliminate radioactive chemical sources in borehole nuclear logging. Pulsed neutron generators have successfully replaced chemical sources in neutron tools, but cesium-137 is still mainly used for borehole density measurements. Neutron-activated gamma-ray measurements (neutron-gamma) are a possible alternative to radioactive chemical sources in density tools. Despite recent advances, the measurement faces challenges regarding density accuracy across diverse solid and fluid rock compositions and nonnegligible sensitivity to borehole environmental effects. We have examined a theoretical, albeit realistic, logging-while-drilling neutron-gamma density (NGD) tool operating with two inelastic gamma-ray detectors and two fast neutron detectors. With a strong emphasis on measurement physics and source-sensor design, the tool delivers density accuracies comparable to those of gamma-gamma density (GGD) tools with [Formula: see text] error in shale-free formations and [Formula: see text] in shale and shaly formations. Our work also compares NGD with GGD in terms of depth of investigation (DOI), vertical resolution, and sensitivity to borehole environmental effects to determine optimal logging conditions. NGD accuracy is limited in the presence of standoff. With inputs of caliper and mud type, empirical density corrections can be applied up to 0.64 cm (0.25 in) standoff. NGD also has limited applicability in thinly bedded formations with maximum vertical resolution of 76 cm (2.5 ft). However, the measurement outperforms GGD in the presence of invasion because its DOI is twice as large.

Neutron capture prompt gamma-ray analysis of stratospheric and groundfall ASH following the MT. ST. Helens eruption of May 18, 1980

1982 ◽  
Vol 71 (1-2) ◽  
pp. 47-58 ◽  
Author(s):  
D. L. Anderson ◽  
J. M. Phelan ◽  
T. Vossler ◽  
W. H. Zoller
Keyword(s):  
Neutron Capture ◽  
Gamma Ray ◽  
Prompt Gamma

scholarly journals Analytical applications of neutron capture gamma-ray spectroscopy

1983 ◽  
Vol 16 (11) ◽  
pp. 2061-2074 ◽  
Author(s):  
A M Hassan ◽  
E Gantner ◽  
E Mainka ◽  
H Ruf ◽  
U Kuhnes ◽  
...  
Keyword(s):  
Neutron Capture ◽  
Gamma Ray ◽  
Analytical Applications ◽  
Gamma Ray Spectroscopy
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