Updated depositional and stratigraphic model of the Lower Jurassic Åre Formation, Heidrun Field, Norway - From Depositional Systems to Sedimentary Successions on the Norwegian Continental Margin - page 255

LEGEND
Uplifted land/structural
high

~250 km

Sedimentary basin

Fault

Sediment transport
d ir ection

Direction of marine
incursion

HT H alten Te rrace

LAURENTIAN SHIELD

Location of Heidrun Field

HT

BALTIC SHIELD

Fig. 2. Palaeogeographic map of the early Jurassic North Atlantic seaway during deposition of the Åre Formation (Modified
from Doré, 1991).

place since production start-up, lack of well-
defined sequence stratigraphic surfaces in pre-
vious models have in many cases prevented
prediction of lateral trends and vertical stacking
patterns. Furthermore, poor biostratigraphic reso-
lution has hindered construction of a well-defined
stratigraphic framework and few marker beds
have been recognised and correlated across the
field. 2) Structural complexity and the lack of a

robust reservoir zonation have created various
difficulties in interpretation of well data and
major challenges in defining and developing
future drilling targets. 3) Previous geological
models of the field have become outdated due to
inconsistencies between new well results and the
former stratigraphic reservoir zonation. The pre-
dictive capability of older models is therefore
limited.