well logging

Which modern technique is most commonly used to improve log interpretation in unconventional reservoirs?

• Image logs

• Image logs

• Core analysis

• Caliper logs

• Machine learning models

Which type of log measure the hydrogen concentration?

• Gamma Ray

• Resistivity

• Density

• Neutron

• FMI

What is Pef of limestone?

• 5

• 3.5

• 2

• 4

• 10

NPHI>DPHI, in Neutron-Density log, indicates what?

• shale effect

• gas effect

• oil effect

• high content of hydrocarbon

• high content of hydrocarbon

What element contain in high  GR reading zone?

• calcite

• potassium

• gold

• radium

• plutonium

NPHI<DPHI, in Neutron-Density log, indicates what?

• shale effect

• gas effect

• oil effect

• high content of hydrocarbon

• high content of shale

What does the resistivity log primarily measure?

• Formation porosity
  
  
  
  

• Borehole rugosity

• Ability of formation to resist electrical current

• Natural radioactivity
  

• Sonic velocity

What does a gamma-ray log typically indicate about the formation?

• Water saturation
  
  

• Porosity

• Permeability

• Shale content

• Borehole collapse

A formation shows low gamma-ray, high resistivity, and moderate
neutron-density porosity. What does this likely indicate?

• Shale gas zone
  

• Water-bearing dolomite

• Clean sandstone with hydrocarbons

• Tight limestone

• Salt plug

In an open-hole log, you observe overlapping neutron and density
logs with low gamma-ray values. What does this likely represent?

• Shale bed

• Water-filled clean sandstone

• Gas-bearing tight zone

• Salt formation

• Oil-filled fractured limestone