Porosity: n, /O

Question 1

Units

Answer 1

%

Question 2

A. Porosity in consolidated sediments and rocks

Answer 2

1. Primary (original, depositional) form on the on the surface of the earth where the sediments were deposited.
2. Secondary (induced) forms in a rack after lithification or crystillization

2 a) solution
b) Fracture

3. Vesicular

Question 3

B. Porosity in unconsolidated sediments is affected by

Answer 3

porosity in unconsolidated sediments is controlled by:

1. particle size (doesnt affect the amount of n)
   n=(volume of pores/volume total) x 100
2. grain shape
3. grain size distribution
4. particle arrangement

Question 4

Permeability

Answer 4

symbol: k
units: m2

k=n. C .(rav)^2

k= permeability in m2
n= porosity in decimal format
c= arbitrary constant 
rav= the av radius of the grains or pores in meters

Question 5

permeability is affected by

Answer 5

a) pore throat diameter (pt)
b) sorting
c) fracturing