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Porosity Logs: Density, Neutron & Sonic
Inside this lesson
- Derive density porosity $\phi_D$ from bulk density and matrix density
- Explain why the neutron log reads hydrogen index and goes low in gas
- Compute sonic porosity $\phi_S$ from the Wyllie time-average
- Recognise density-neutron gas crossover as a gas indicator
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Educational content covering topics typical of an undergraduate petroleum-engineering curriculum. Not a substitute for accredited coursework, and not suitable for real well, reservoir, or field decisions without review by a licensed professional engineer. Well-control content is conceptual awareness only and is not IWCF/IADC training. References to reserves or resource classifications are descriptive context only, not regulatory disclosure or booking guidance.