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is determined by the volume of liquid pulled out of the glass after
immersing the rock sample saturated with the same liquid).
The effective porosity factor by I.A.Preobrazhensky’s method

could be calculated by means of the equation:

V G  G
m  int. p.  3 1
ef. p. , (2.2)
V G  G
b.r.s. 3 2
where G is the weight of the dry rock sample in air, g; G is the

1

2
weight of the rock sample saturated with kerosene (after vacuuming)
in kerosene, g; G is the weight of the rock sample saturated with
3
kerosene (after vacuuming) in air, g.
G  G
V  3 1 , (2.3)
int. p.
 k
G  G
V  3 2 , (2.4)
b.r.s.
 k
3
where V is the volume of interconnected pores, m ; V is the bulk
int. p. b.r.s.
3
3
volume of the rock sample, m ;  is kerosene density, kg/m .

k

2.3 Equipment, devices and materials

The following equipment and materials should be used for the
experiment: analytical balance; the rock sample (extracted and dried);

kerosene; fine wire or kapron thread for hanging up the rock sample;
metallic or glass bridge (stand) and glass capacity of 100 ml (for
weighing the rock sample in kerosene) and the installation for

vacuuming IV-3 (ВУ-3) which consists of vacuum pump,
vacuummeter, Boonzen’s flask (the flask for vacuuming), three-way
cock, Tishchenko’s capacity, piston, cylinder and rubber plug

(figure 2.1).

2.4 Procedure and calculations

2.4.1 Tie dry extracted rock sample by means of the fine wire and
weigh it in air (G , g).
1
2.4.2 Hang up rock sample 1 to piston 2 in cylinder 3 (figure 2.1).
Fasten the cylinder with piston with rubber plug 4 in Boonzen’s flask
5. (The length of the wire should be selected so that the rock sample
has to be over the level of kerosene in Boonzen’s flask).

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