Calculate Sonic Derived Porosity- Shale Corrected - Dresser Atlas (1979)

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List of equations assignment

Sonic Derived Porosity- Shale Corrected - Dresser Atlas (1979)

Dresser Atlas (1979) created an equation to calculate the shale corrected sonic derived porosity, using Wyllie (et al., 1958) equation as the basement, and considering the shale volume and sonic porosity in a nearby shale values. The expression is the following:

Where:
• ɸSe= effective (shale-corrected) sonic porosity
• ɸS= sonic porosity
• ɸSsh= sonic porosity in a nearby shale
• Vshale= shale volume
• Δtlog= interval transit time of the formation (from the sonic log)
• Δtma= matrix interval transit time
• Δtfl= fluid interval transit time
• Δtsh= interval transit time in a nearby shale

Calculate Sonic Derived Porosity - Shale Corrected - Dresser Atlas (1979)
Δtlog: µs/ft		Δtma: µs/ft
Δtfl: µs/ft		Δtsh: µs/ft
Vsh: Decimal

Made by Henry Herrera