Reading...
Play button
Play button
Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
18 Cards in this Set
- Front
- Back
|
Neutron Logging Shows (5)
|
- gas in subsurface
- lithology - evaporates - hydrated minerals - igneous rocks |
|
|
CNL
|
compensated neutron log
|
|
|
DNL
|
dual neutron log
|
|
|
2 Neutron Sources
|
- chemical
- pulsed |
|
|
chemical sources (2 combos)
|
- plutonium/beryllium
- americium/beryllium |
|
|
fast neutrons
|
~4 MeV or 28,000 km/s
|
|
|
epithermal neutron
|
~.2 - 1 eV or 5 km/s
|
|
|
thermal neutron
|
same energy level as surrounding matter
|
|
|
capture gamma ray
|
when neutron reaches thermal energy and is captured by nucleus emitting gamma ray
|
|
|
2 Elements Dominate Behavior of all Neutron Tools
|
H and Chlorine
|
|
|
___ is best at slowing down neutrons
|
H
|
|
|
___ absorbs 100x faster for thermal neutrons
|
Chlorine
|
|
|
CNL (2 hole environments)
|
- cased
- open |
|
|
gas formation
|
Pd > Pn
|
|
|
shale formation
|
Pd < Pn
|
|
|
Porosity in Gas Zones
|
formula
|
|
|
Porosity in H20 Zones
|
formula
|
|
|
neutron tool response opposite gypsum
|
annhydrite
|
