Calculate Neutron - Density Porosity - Shale Corrected - Dewan (1983)

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List of equations assignment

Neutron-Density Combinaton Porosity- Shale corrected- Dewan (1983)

Dewan (1983) also proposed a shale correction to porosity values obtained from the combination of neutron and density well logs. This expression is represented as the square root of the sum of the squared shale corrected porosity values of each well log (neutron and density). The ecuation is expressed the following way:

Where:
• ɸND= neutron-density porosity- shale corrected
• ɸDe= density porosity- shale corrected
• ɸNe= neutron porosity- shale corrected

Porosity - Neutron-Density (ɸnd) - Shale corrected- Dewan (1983)
ɸne: Decimal		ɸde: Decimal

Made by Henry Herrera

Calculate Neutron - Density Porosity

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List of equations assignment

Neutron-Density Combination Porosity: Gas detection

In gas bearing formations, a combination is made between the values obtained from neutron and density logs. For those who know about wells, it is known that when the curves of both logs cross between (crossover), we can infer the presence of a gas accumulation, although other paramaters neeed to be taken into account like well bore conditions (caliper log), among others. The expression is the following:

Where:
• ɸNDgas= gas bearing formations porosity
• ɸN= neutron log porosity
• ɸD= density log porosity

Calculate Neutron-Density Combination Porosity (ɸnd)
ɸn: Decimal		ɸd: Decimal

The following equation also allow us to obtain a similar value to the first equation:

Calculate Porosity - Density- Neutron (2) (ɸnd)
ɸn: Decimal		ɸd: Decimal

Made by Henry Herrera