Calculating Porosity and Permeability with Well Logs

[soman703]

Hello everyone,

Can anyone please tell me detailed method or refer me to any link/ sample
on how to calculate Porosity and Permeability from Well Log?


Thankyou,

[Fendbong]

For calculating porosity from well log, you can use Archie Equation and its derivation based on formation you evaluate.
For calculating permeability you can use several correlation such as Indonesia, etc.

[soman703]

Thankyou so much Fendbong!

[Fendbong]

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Re: Calculating Porosity and Permeability with Well Logs
For calculating porosity from well log, you can use Archie Equation and its derivation based on formation you evaluate.
For calculating permeability you can use several correlation such as Indonesia, etc.

You are welcome. But I have to apologize, My Friend. I think I've mistaken between porosity and water saturation. The one that can be calculated using Archie Equation and its derivation is water saturation. From well logs, porosity can be determined directly from middle value between neutron and density log on the tray for quick purpose (the porosity from middle value can be read from neutron scale as neutron log scale give direct reading of porosity). For more valid value of porosity, calculation need to be done for density, neutron and sonic log with several correction.
Once again, I'm sorry for my mistake.

[temr]

It is not simple question since definition of main reservoir parameters such as NTG, Poro , Vsh and Sw is not a easy thing.
First of all it will depends what king of reservopir you are trying to evaluate snds or corbons.
Porosity are measured based on sonic density and nuetron logs and basicaly takes as average between of them
Volume of shale measured from gamma ray based on minimum and maximum readings withing top and bottom of exact reservoir
Sw can be culculated from Archie Low, but it only work in clean sand in shaly sands and corbons archi is not a good tool to define Sw ( Pc is most preferable)
Permiability can not be defined without core or well test data
So as you can see it is not quick and fast How To Question.
Try to read this Rider_WellLogging

[reservoirengineer]

Check Crain's Website

[link Point to another website Only the registered members can access]

Hello everyone,

Can anyone please tell me detailed method or refer me to any link/ sample
on how to calculate Porosity and Permeability from Well Log?


Thankyou,

[Atif Ismail]

Asalaam o Aalikum,
There are multiple ways to calculate porosity and permeability using wireline logs depending upon the availability of data.
POROSITY
you use density log, sonic log, Neutron log, Nuclear Magnetic Resonance Log for calculation of porosity. But you should be fully aware about the limitations of each tool. Donot forget to trim the erroneous data using caliper and DRHO log. Make Corrections according to log adopted to calculate porosity.
PERMEABILITY
There are multiple empirical formula present in literature to calculate the permeability like Morris and Biggs, Timur, Coates, Kozeny Carman etc. You may calculate permeability using these methods. For these methods, you need to Swir (Irreducible water saturation) which may get from Buckles approach if core measurements are not present.
IMPORTANT NOTE
Specially permeability is very difficult to estimate. You always required to calibrate your results with core data for same zone of interest. In case of any discrepancy iterative method is used for the range of values for specific formula parameter.

[Atif Ismail]

Asalaam o Aalikum,
There are multiple ways to calculate porosity and permeability using wireline logs depending upon the availability of data.
POROSITY
you use density log, sonic log, Neutron log, Nuclear Magnetic Resonance Log for calculation of porosity. But you should be fully aware about the limitations of each tool. Donot forget to trim the erroneous data using caliper and DRHO log. Make Corrections according to log adopted to calculate porosity.
PERMEABILITY
There are multiple empirical formula present in literature to calculate the permeability like Morris and Biggs, Timur, Coates, Kozeny Carman etc. You may calculate permeability using these methods. For these methods, you need to Swir (Irreducible water saturation) which may get from Buckles approach if core measurements are not present.
IMPORTANT NOTE
Specially permeability is very difficult to estimate. You always required to calibrate your results with core data for same zone of interest. In case of any discrepancy iterative method is used for the range of values for specific formula parameter.