How to find field candidates for enhanced recovery by water ... - Force

Reservoir Complexity Index (RCI)
– parameters used in evaluation
Complexity
attribute
Description
Low complexity
1
2
Complexity score
3
4
High complexity
5
Average
permeability
Describes the pore volume weighted
average permeability in the main
flow direction of the defined
reservoir. mD
> 10.000
1000-
10
00
0
100-1000
10-100
< 10
Permeability
contrast
Describes the permeability contrast
between geological layers/facies
types, and is calculated as
log10[Kmax/Kmin]
4
Structural
complexity
Describes how fluid flow between wells
is affected by fault density, fault
throw, fault transmissibility, ….
The fault properties
does not restrict
fluid flow.
The fault properties restrict
fluid flow significantly.
(High density of faults
with throw larger than
reservoir thickness
and/or 'zero'
transmissibility).
Lateral stratigraphic
continuity
Describes the stratigraphic continuity of
the flow units in the main flow
direction within the defined
reservoir
High degree of
continuity
Highly discontinuous.
Difficult to
predict/describe
injector/producer
connecting flow units.
STOOIP density
Describes the areal concentration of
STOOIP and is defined as
STOOIP/area
(mill. Sm3/km2)
>4.5
2 - 4.5
1 - 2
0.5 - 1
< 0.5
Coning tendency
Describes the coning problems
associated with a gas cap or
aquifer support. Large complexity
only in cases where the oil band
is thin.
No coning tendency.
Some coning
problems
from gas
cap or
aquifer
Thin oil zone and production
severely restricted by
gas or water coning
problems
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