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а) б)
J  J  від
1.0
10 0.8

8 0.6
6 0.4

4 0.2

K ,% K ,%
п
п
20 40 20 40

Figure 3.4 - Dependence J γ (a) and ΔJ γ (b) from the K p

Considering that absolute value also depends on many
other factors besides clayness, it is advisable to use the relative
value of gamma radiation (Fig 3.4 b.)

I  x  I  min
I   1, (3.3)
 max min
I  I
 
min max
where I γ , I γ - determine the intensity of gamma radiation for
supporting layers with a known value of the porosity coefficient
x
(respectively maximum and minimum); I γ - intensity gamma
radiation to the reservoir with unknown value of K p.

Method NGL

As we know from the theory, the value of the radiation
intensity I nγ, mainly depends on the amount of hydrogen in the
rocks. Thus, the more value of K p the greater hydrogen content in
these rocks. Between intensity I nγ and K p is a direct correlation, an
increase K p results in an increase I nγ (Fig.3.5a).

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