World Geography Oil Rig Worksheet Page 2
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Same point as above about pontoons
Semi-
1000m+
(2000m?)
Deeper water where
submersible
and pumps
Dynamically
Uses
computer
controlled
thrusters
to
anchors
won’t reach and
Positioned
hold the location (uses
satellite
and
where seas are heavier
(ODR)
GPS
to keep position – like auto pilot)
Shallow water on the
3 parts to the GBS
Hibernia
(Gravity
based
GBS (p188-
Grand Banks
structure)
Concrete
189 text)
80m
depth
slab
on ocean floor
Limited to a height of
111m
high
caisson
(concrete cylinder)
concrete
caisson
on
which sits on slab
which the platform sits
Platform
sits on the 4
shafts
in the
Built to withstand the
caisson
Atlantic
Ocean; fog, ice,
The platform sits on these 4 shafts
sea spray, high waves
(27m), icebergs
and is supported and protected by the
caisson
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