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6. Lithology and Porosity in Complex Formations

• Crossplots:

 –  Neutron-Density

 –  Sonic-Density –  Sonic-Neutron

• Effect of: 

 –  Gas, dispersed clay

• M-N Plot

• MID plot 

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ChartCP-1c

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Chart

CP-1a

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Chart

CP-1b

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FDC Density - Sonic Crossplot

(useful for distinguishing evaporites)

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Chart

CP-7

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Chart

CP-2a

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Chart

CP-2b

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Chart

CP-16

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Chart

CP-17

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Chart

CP-8

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M-N plot

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M and N values for common minerals

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Matrix Identification (MID) Plot

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Chart

CP-15

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MID PLOT

From LogNeutron-Density crossplot (CP-1a, CP-1b)

From Log Neutron-Sonic crossplot (CP-2a, CP-2b)

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Chart

CP-21

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