Geoscience Reference

In-Depth Information

Fig. 3.40
Example model of heterolithic flaser bedding

(
left
) with corresponding permeability model (
right
).

Note the bi-directional sand lamina sets (
green
and

yellow
laminae) and the partially preserved mud drapes

(
dark tones
). Higher permeabilities indicated by
hot

colours
(Modified from Ringrose et al.
2005
Petrol

Geoscience, Volume 11,

Geological Society of

#

London [2005])

Fig. 3.41
Results of sub-

metre-scale simulation of

heterolithic bedding in tidal

deltaic reservoirs. Effective

permeability simulation

results are for the constant

petrophysical properties

case (i.e. sandstone and

mudstone have constant

permeability). Observed

effective permeability is

compared to bedding styles

and the critical points
A
,
B

and
C. A
is the percolation

threshold for k
x
, and
C
is

the percolation threshold

for k
z
, while
B
is the

theoretical percolation

threshold for a simple 3D

system. Thin lines are the

arithmetic and harmonic

averages

Lenticular
\

Wavy
\

Flaser

x

z

100

Kx

Kz

Ky

80

A

B

C

60

40

20

0

100

Kx

Kz

Ky

10

1

0.1

0.01

0

0.2

0.4

0.6

0.8

1

V
sand