Page 199 - The Geological Interpretation of Well Logs

- THE DIPMETER -

GAMMA |DEPTH RAW CURVES NEUTRON
m
RAY
Resistivity — DENSITY
2 SHALE
|

TURBIDITES

ELL | 1

“29590
SHALE
Figure 12,28 Typical dipmeter response in @ turbidite sequence. The turbidite sands show scattered dips with no preferred
orientation. The shale sections show regional dip (shale 1) and drape over very subdued submarine topography, in this case a
lobe (shale 2). The acquisition curves are essentia) to fine lithological interpretations in such (thin-bed) sequences.

or ——— ao 20° 50° Rasistvity oo,
==>
%
—=>=
y
Po ll ae ll
Sem F 8
Sm
poe
= => .
=a] \ x
4
1oem . —y 10m y
Wl (Wu
&. LAMINATED sifty shale
Pad
Hl We tba 0 20° 50° Resistivity —e

10¢m}

B. FLASER-LINSEN sands and shales

a
o
20°
[Oe aed
Resistivity —e
60°
| Weer 4 2 Ra é e
2 pP
\\ a on ‘p
=> Ry
ens % &
=
10m = “
toem Lea > S ’ in 3
ee
=
ao
WD

C. BIOTURBATED sandy shale
Figure 12.29 Texture and facies indicated by dipmeter acquisition curves and dipmeter plots. A. Laminated silty shales give
regular dips but little acquisition curve character; B. flaser and linsen give excellent curve character but irregular, variable dips;
C. bioturbation can give good curve character which is, however, irregular and produces poor quality, scattered dips (the
so-called bag-of-nails).
189