Page 256 - The Geological Interpretation of Well Logs

- THE GEOLOGICAL INTERPRETATION OF WELL LOGS -

GAMMA
0 50

sla °
4O]S
als °
ola °

fo °

rE
o
o |S].
SE A
N .
Els A
lela 4
uw ~
~~ a
7 A
z
<|_ A °
fs Ag
c &
| mmee
uw .
ale
845|§
a lz
3
>|F
dx G
a 6%
ez
2 |Sts 3
3 BE $
E—|5]= 3
z &
£ £ 4dtic é §
BIS 8 weak-moderate
i|>

a Chatk Bloturbatlon matres
m me ©
HEH Argiliaceous
cc chal
2 Intense « Chondrites © Zoophycos
Marlstone
SG Gtauconite ° Planolites § Tetchichnus
— Ctaystone P Pyrite
Figure 15.10 Organic rich condensed sequences from a carbonate succession. Lower Cretaceous, Danish North Sea (from
Ineson, 1993).

SED. (core) LITH

GR 2rha0°T ad
100) |

p_GA DT~
middle-lower
shoreface

CONDENSEO
1690m- MFS
SEQUENCE

transgressive
deposits

“\. TRANSGRESSIVE

1700m - upper
SURFACE
shorefaca

Figure 15.11 A maximum flooding surface (MFS) in a shoreline (proximal) environment. High energy in general, even during
maximum flooding, makes for subdued log responses. Without core, such an interpretation would be extremely difficult.
246