Geoscience Reference
In-Depth Information
Fig. 6.31
Modelling the Gres d'Annot. (
) Static well
model sections with heterolithics in
orange
.(
a
left
. Production is from horizontal wells in the upper
reservoir.
Upper image
: no heterolithics;
) Impact of
heterolithics in a high N/G reservoir (Coulomp Valley
section) on sweep efficiency during a water flood of a
viscous oil;
green ¼
oil,
blue ¼
water, injection from
b
lower left
:
heterolithics with effective k
v
¼
1 mD;
lower right
:
heterolithics with effective k
v
¼
0.1 mD (Image courtesy
of M. Bentley & E. Stephens)
6.6.1 Depositional Architecture
modern analogues is weaker than for clastic
systems simply because of the organic aspect of
carbonate sedimentology - modern day
organisms do not necessarily build carbonate
reservoirs the same way as their ancestors, and
current climatic changes do not automatically
match those of the past. There is therefore a
greater need to derive geometric data from
stratigraphically and environmentally appropri-
ate settings than is the case for many clastic
reservoirs.
Where reservoir heterogeneity is controlled by
original depositional patterns and processes, car-
bonate modelling is open to the same options
for rock modelling as those which apply for
siliciclastic reservoir models. An important dif-
ference is the more limited reservoir modelling
database for carbonates, and the tendency is
therefore to rely more on modern environmental
analogues (Burchette
2012
). However, the link to
