Measure formation porosity
Measure formation permeability
Identification of gas bearing zones
Determine formation lithology
Determine formation resistivity
All tools are calibrated at the API test pit in Houston
A snow block is used to verify neutron tools at the well site
A horizontal water tank is used to calibrate neutron tools at the well site
The standard tool is calibrated at the API test pit in Houston
The DSNT is used to help estimate the volume of shale in a formation when combined with density porosity or sonic porosity
The DSNT is used to help determine a value for true resistivity of a formation
The DSNT is often used as a qualitative estimate of permeability.
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Air-drilled holes
Oil-based muds
Saltwater based mud
Freshwater-based mud
Oxygen
Hydrogen
Helium
Kryptonite
Helium and uranium
Potassium and thorium
Americium and beryllium
Protium and tritium
10 MeV - 1 MeV
1 MeV - 10 eV
10 eV - .1 eV
Less than .1 eV
Higher
Lower
Same
Static
Direct
Glancing
T-Bone
10%
35%
40%
50%
10
18
46
105
Helium
Hydrogen
Argon
Neon
Krypton
Hydrogen concentration does not influence count rate
High concentration of hydrogen results in lower count rates
Low concentration of hydrogen results in lower count rates
Taylor can throw an orange 1000 feet.
Collection Anode
Scintillation Crystal
Cathode
Number of epithermal neutrons multiplied by 100
Number of thermal neutrons multiplied by 100
Number epithermal neutrons detected in one second
Number of thermal neutrons detected in one second
Increases the count rate
Decreases the count rate
Does not change the count rate
The larger the hole size, the lower the count rate detected
The larger the hole size, the higher the count rate detected
Large hole size has no effect on the count rate detected
Size does matter according to women
The distance between the tool and the borehole wall
The centralization of the detector in the borehole
Any physical separation between a detector and formation
Someone who doesn't want to talk to anyone
True
False
Sandstone
Dolomite
Limestone
Short spaced detector count rate to the long spaced detector count rate
Long spaced detector count rate to the short spaced detector count rate
Increases
Decreases
Remains the same
Quartz sandstone is characterized by a higher SS/LS ratio than limestone
The SS/LS ratio increases with increased porosity
The SS/LS ratio decreases with increased porosity
Dolomite is characterized by a lower SS/LS ratio than limestone
The SS/LS is inversely proportional to formation porosity
Formation lithology must be known to determine accurate formation porosity.
Different formation lithologies do not affect the formation porosity.
Increase
Decrease
Not Change
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