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Laboratory work №2

BUILDING A REAL CURVE OF LATERAL LOGGING
(LL)

2.1 The purpose of work

Remove values from the curves of lateral logging, build the
actual curve, determine the type and get the practical skills in data
interpretation of LL.

2.2 Theory

Removing the values from lateral logging curves

The value of layer geophysical parameters (G par) can be
calculated by knowing the value of deviation curve ("l" in cm)
from the count line taking into account the horizontal registration
scale:
G  l  M , (2.1)
par
where: G par – the value of geophysical reservoir parameter; l -
deflection curve from the count line in cm; M – horizontal
registration scale of geophysical parameter (eg. 1 Ohm*m/cm).
For curves of geophysical parameters that are symmetrical,
the deviation curve (l) is taken in front of the middle layer (Fig.
2.1, a).
For gradient probes, considering the asymmetric nature of
curve, opposite layer can have different meanings of geophysical
parameter (imaginary resistance): ρ max - the maximum; ρ min -
av
minimum; ρ opt - optimal; ρ – average.
Depending on the ratio of the layer thickness (h) to the size
of probe (L p) - h / L p should be defined ρ ir so:

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