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→Example density–neutron crossplot
===Example density–neutron crossplot===
===Example density–neutron crossplot===
[[file:predicting-reservoir-system-quality-and-performance_fig9-31.png|300px|thumb|{{figure number|2}}Example density-neutron cross plot. From Alberty (1992); courtesy AAPG.]]
[[file:predicting-reservoir-system-quality-and-performance_fig9-31.png|300px|thumb|{{figure number|2}}Example density-neutron cross plot. From Alberty;<ref name=Alberty /> courtesy AAPG.]]
[[:file:predicting-reservoir-system-quality-and-performance_fig9-31.png|Figure 2]] is an example density-neutron crossplot. Points 1–5 are from the log ([[:file:predicting-reservoir-system-quality-and-performance_fig9-30.png|Figure 1]]). Points 2, 3, and 4 are from a zone that shows crossover. Crossover occurs when the density log reads higher than the neutron log in a zone of the same lithology as the log matrix lithology, i.e., sandstone. Point 2 has the greatest crossover; Point 4, the least. Once completed, the well from which this log was taken showed Point 2 to be in a gas reservoir, Point 3 to be in light oil reservoir, and Point 4 to be in a zone with residual oil.
[[:file:predicting-reservoir-system-quality-and-performance_fig9-31.png|Figure 2]] is an example density-neutron crossplot. Points 1–5 are from the log ([[:file:predicting-reservoir-system-quality-and-performance_fig9-30.png|Figure 1]]). Points 2, 3, and 4 are from a zone that shows crossover. Crossover occurs when the density log reads higher than the neutron log in a zone of the same lithology as the log matrix lithology, i.e., sandstone. Point 2 has the greatest crossover; Point 4, the least. Once completed, the well from which this log was taken showed Point 2 to be in a gas reservoir, Point 3 to be in light oil reservoir, and Point 4 to be in a zone with residual oil.