reservoir geomecanics

SSTAVD (feet)
a.
Pressure (×1000 psi)
b.
Pressure (×1000 psi)
5500
3 4 5 6
7
5500
3 4 5 6
7
JD
SEL 330/FB-A
JD
SEL 330/FB-B
6000
6500
7000
7500
KE-1
LF
NH
SHALE Pp
OVERBURDEN
OI-I
SHALE
S hmin from LO T/FIT
S hmin
regression
P p (compaction model)
P p regression
SAND
Hydrocarbon P p at top
P p from pressure survey
Gas phase
Oil phase
Frictional limit for Caprock
(0.3 < m < 0.6)
6000
6500
7000
7500
KE-1
LF
MG-3
OI-I
OVERBURDEN
8000
8500
HYDROSTATIC
2400
2600
SSTVD (meters)
8000
8500
SHALE Pp
HYDROSTATIC
9000
20 24 28 32 36 40 44 48
9000
20 24 28 32 36 40 44 48
Pressure (MPa)
Pressure (MPa)
Figure 11.20. Pressure in various reservoirs in South Eugene 330 Field in (a) fault block A and (b) fault block
B. The map of the OI sand in Figure 2.7 identifies the location of fault blocks A and B. The geologic
cross-section shown in Figure 2.6a identifies the various reservoirs. The square-with-cross symbol indicates
the measurement point with the pressures extrapolated to greater and lesser depth from knowledge of the
hydrocarbon column heights and fluid densities. Note that only the pressure at the top of the OI sand columns
are near the dynamic limit for inducing slip on reservoir bounding faults. After Finkbeiner, Zoback et al.
(2001). AAPG C○ 1994 reprinted by permission of the AAPG whose permission is required for futher use.
HIGH
a. 600 m b.
600 m
UPDIP
N
N
1985 1992
A10ST
LOW
Relative
Reflectivity
Figure 11.21. Maps of fault plane reflectivity in the SEI-330 field in (a) 1985 and (b) 1992 that appear to
show a pocket of hydrocarbons moving updip along the fault plane. After Haney, Snieder et al. (2005). The
location of the fault along which this burp of hydrocarbons is moving (and position of well A10ST along the
fault) can be deduced by comparing the maps in Figures 8.11b and 2.7.