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5. dc - small reduction in diameter of the well, compared with
the chisel diameter (d w <d ch); through the formation of clay crust.

Determination the K p and K og according to GWL

The principle of determining K p and K og according GWL
based on the fact that the value of geophysical parameters that are
recorded, in one or another extend depends on the K p and K og.
For practical solving these problems using geophysical
parameters that have the greatest relationship with K p and K og.

Method for determining the K P according to GWL

Porosity ratio affects on the figure of many geophysical
parameters. Restrict the analysis of the impact for the following
methods: IR, SPL, GL, NGL, AL.

Method IR

As we know from the theory of electrical resistance method
an increase K p leads to reduce resistance of penetration zone if it is
filled with electroconductive fluid, that there is an inverse
relationship between the ρ pz and K p.
Porosity ratio can be expressed through parameter of
porosity (Fig.3.1):

1    pz
P   wl  lw   1, (3.1)
p m
K     q Q
p w f f

where: P p - parameter of porosity; K p - coefficient of porosity; m -
structural indicator that depends on the shape of pore channels and,
basically equal to 2; ρ wl - resistance of the aquifer; ρ w - resistance
formation water; ρ lw – resistance of completely washed zone; ρ pz –

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