Question

Which one of the following expressions represents porosity of a rock?

• A. \( \frac{{Solid volume – Pore volume}}{{Solid volume}} \)
• B. \( \frac{{Bulk volume – Pore volume}}{{Bulk volume}} \)
• C. \( \frac{{Bulk volume – Solid volume}}{{Solid volume}} \)
• D. \( \frac{{Bulk volume – Solid volume}}{{Bulk volume}} \)

Hint:

Porosity is a critical parameter in geology, particularly for understanding fluid storage in rocks.

Answer 1

The Correct Option is D

Porosity is the ratio of the pore volume to the bulk volume of the rock. The expression for porosity \( \phi \) is given by: \[ \phi = \frac{{Pore volume}}{{Bulk volume}} = 1 - \frac{{Solid volume}}{{Bulk volume}} \] Thus, the correct formula for porosity is: \[ {Porosity} = \frac{{Bulk volume – Solid volume}}{{Bulk volume}} \]