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Crossplots & Lithology Identification
Inside this lesson
- Read the sandstone, limestone, and dolomite lithology lines on a density-neutron crossplot
- Explain how gas shifts points up-left and causes crossover
- Describe how shale plots to the lower-right (high neutron, lower density porosity)
- Combine density and neutron porosity to estimate clean and gas-corrected porosity
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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.