4. Elemental capture spectrometry
Measures relative elemental yields based on neutron
induced capture gamma ray spectrometry “
characteristic” .
Detector measures the counts and energy spectrum
from released gamma rays , Combining the results with
other logs such as “RHOB &PEF’’
5. ECS detection
Si >> Silicon
Fe >> Iron
Ca >> Calcium
S >> Sulfur
Ti >> Titanium
Gd >> Gadolinium
Cl >> Chlorine
Ba >> Barium
H >> Hydrogen
6. Brittleness index
Ratio of compressive strength “c” to tensile
strength “t”
BI = бc / бt
Only in Labs !
Difficult to extend this definition to the reservoir scale
7. Jarvie & Wang
BI “jarvie_2007’’ = Qz /(Qz +Qa + cly )
BI “Wang_2009” = (Qz + Dol)/(Qz +Dol +Qa + cly + TOC)
High quartz and Calcite content regions are more brittle
than the regions with high clay Content “ which is less
brittle; Ductile ‘’