Neutron logs are used to determine

Neutron logs are used to determine

• A. Moisture content and porosity.
• B. Permeability and density.
• C. Lithology and magnetic susceptibility.
• D. Pore pressure and temperature.

Answer: (A)

Neutron logs respond to hydrogen nuclei in the formation, so they track how much hydrogen-bearing fluid is in the pore spaces. Since porosity is the fraction of pore space and most hydrogen resides in the fluids occupying those pores, a stronger neutron signal corresponds to higher porosity and, in saturated rocks, higher moisture content. That’s why neutron logs are used to estimate both moisture content and porosity, especially when interpreted alongside other logs to separate the rock matrix from the pore fluids. They don’t directly measure permeability, which relates to how easily fluids can flow through the rock rather than how much hydrogen is present. They don’t directly measure lithology or magnetic susceptibility, which are inferred from other logging responses. They also don’t provide pore pressure or temperature readings, which require different tools or methods.

Neutron logs respond to hydrogen nuclei in the formation, so they track how much hydrogen-bearing fluid is in the pore spaces. Since porosity is the fraction of pore space and most hydrogen resides in the fluids occupying those pores, a stronger neutron signal corresponds to higher porosity and, in saturated rocks, higher moisture content. That’s why neutron logs are used to estimate both moisture content and porosity, especially when interpreted alongside other logs to separate the rock matrix from the pore fluids.

They don’t directly measure permeability, which relates to how easily fluids can flow through the rock rather than how much hydrogen is present. They don’t directly measure lithology or magnetic susceptibility, which are inferred from other logging responses. They also don’t provide pore pressure or temperature readings, which require different tools or methods.