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Questions and Answers
What do Petrophysics & Log Analysis measure in terms of rock properties?
What do Petrophysics & Log Analysis measure in terms of rock properties?
- Porosity and Water Saturation
- Core analysis and Resistivity
- Density and Neutron (correct)
- Permeability and Lithology
How is Water Saturation defined in the context of rock analysis?
How is Water Saturation defined in the context of rock analysis?
- The amount of pore space in the rock
- The fraction of pore space occupied by water (correct)
- The correlation between porosity and resistivity
- The quantity of fluid that can flow in the rock
What property does Permeability quantify in a rock formation?
What property does Permeability quantify in a rock formation?
- Amount of pore space in the rock
- Ability of fluid to flow through the rock (correct)
- Correlation between resistivity and lithology
- Density of the rock
How are Porosity and Resistivity related in rock analysis?
How are Porosity and Resistivity related in rock analysis?
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What is the significance of Reservoir Bed Thickness & Net Pay in relation to rock formations?
What is the significance of Reservoir Bed Thickness & Net Pay in relation to rock formations?
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Study Notes
Petrophysics & Log Analysis
- Lithology is the study of the type of rock.
- Log measurements include: • GR (Gamma Ray) • Neutron • Density • Photoelectric • Resistivity
- Cuttings analysis and core analysis are used to examine the rock.
Porosity
- Porosity is the amount of pore space in the rock.
- Log measurements that help determine porosity include: • Neutron • Density • Sonic • NMR
- Core analysis is also used to determine porosity.
Water Saturation
- Water saturation is the fraction of the pore space occupied by water.
- It is determined by combining: • Porosity • Resistivity • Lithology
Permeability
- Permeability is the quantity of fluid that can flow as a function of time and pressure.
- It is measured using: • Formation testing • NMR logs
- Empirical correlation to porosity can also be used.
- Core analysis is used to determine permeability.
Reservoir Bed Thickness & Net Pay
- Reservoir bed thickness is the thickness of the rock with enough permeability to deliver fluids to a well bore.
- Net pay is the rock with enough permeability to deliver fluids to a well bore.
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