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1.4.6 Calculate the imaginary(apparent)densityof the rock sample

 by the following equation:
r.s.
G
  1
r.s.
G  G G  G , (1.5)
2 3 2 1

 w.  par.
where  and  par. are densities of water and paraffin accordingly,
w.
3
kg/m .
It is recommended to take the density of paraffin equal to 850 kg/
3
m .
1.4.7 Put the data of experiments and calculations for

determining the imaginary (apparent) density of the rock sample 
r.s.
and absolute porosity factor of the rock m ab.p. into table 1.1.

1.4.8 It is recommended to take the density of grains forming the
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rock equal to the one for sandstone that is 2250 – 2670 kg/m [3, 4].
1.4.9 After determining the rock sample density  calculate the
r.s.
absolute porosity factor of rock m ab.p. using the equation (1.4) and data
from table 1.1 and draw the conclusion.

1.5 Checking questions

1.5.1 What is porosity of rock and porosity factor?
1.5.2 Name the types of porosity and give the definitions.
1.5.3 Within what range of value does the porosity of rocks

saturated by oil and gas change?
1.5.4 In what calculations in oil and gas engineering is porosity of
rock used?
1.5.5 What factors does the porosity of rocks depend on?

1.5.6 What equipment, devices and materials are used for
the laboratory experiment?

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