"Default porosity" definition

Hi everyone,

Just a quick post to ask a simple question: is the "default porosity" POR in ROCKS the total porosity?

For instance, total porosity for clay formations is, in general, about 40-50%. But their effective porosity is about 1%.

In TMVOC, should we input total or effective porosity?

Thanks in advance,


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  • Quentin,

    It depends...

    I propose you look at the governing equations to see how porosity is used (i.e., in the storage term, but also to calculate phase velocities, and for certain diffusion calculations, etc.). That will determine which number to use in a simulation. Also consider which laws are used in the pore space you want to simulate (using Darcy's law in the interlayer space of a clay may be inappropriate). Finally, consider the use of a double-porosity approach to separate out different "pore domains".


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