Crain's Usage Rules For Selecting LITHOLOGY Models
The quality of the answers for all lithology
models will vary, and in some
cases be unreasonable or impossible to calculate due to lack of
data. In order of preference, we would choose:
Special case for gas zones
1.
PE
2-Mineral Model
Uses PE log only. The PE has no gas effect so is the BEST
and ONLY model for gas
zones. Also good in oil or water zones.
3-Mineral MODELS
DO NOT use in
gas zones.
2. DENSma - Uma 3 - Mineral Model
Uses PE, Density, Neutron logs, BEST model in good borehole
3. Mlith - Plith 3-Mineral
Model
Uses PE, Sonic, Neutron, may be OK in rough borehole.
4. Mlith - Nlith3-Mineral
Model
Usws Sonic, Density, Neutron logs
5. Alith - Klith 3-Mineral
Model
Uses Sonic, Density, Neutron logs
2-Mineral MODELS
6.
PE
2-Mineral Model
Uses PE log only. The PE has no gas effect so is the BEST
and ONLY model for gas
zones. Also good in oil or water zones.
DO NOT use the following in
gas zones.
7. Uma 2-Mineral Model
Uses PE and Density logs
8. DENSma 2-Mineral Model
Uses Density log and PHIe from any porosity model.
9. DTCma 2-Mineral Model
Uses Sonicy log and PHIe from any porosity model.
10. Plith 2-Mineral
Model
Uses PE and Density logs.
11. Mlith 2-Mineral
Model
Uses Sonic and Density logs.
12. Nlith 2-Mineral
Model
Uses Neutron and Density logs.
13. Alith 2-Mineral
Model
Uses Neutron and Density logs.
14. Klith 2-Mineral
Model
Uses Sonic and Density logs.
15.KUT Clay Typing Models
Uses Spectral Gamma Ray log.
MULTI-Mineral and statistical MODELS
Usually work
when gas, if present, is treated as one of the minerals.
See links in menu at the right.
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