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For peteroleum engineering: Why the pore volume compressibility equation is expressed with a positive sign? And...

For peteroleum engineering:
Why the pore volume compressibility equation is expressed with a positive sign? And how can I express volume of compressibility in terms of porosity instead of volume?
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Answer #1

Pore volume compressibility equation is positive sign because the pore volume increases as pressure in the pore volume increases.

Where is pore volume compresibility

is pore volume

P is pressure of fluid in pores

is porosity

is bulk volume

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