Transcript Davis-Slides

Seismic Reservoir Characterization
of the Morrow A Sandstone
Postle Field, Texas County, Oklahoma
Thomas L. Davis & Robert D. Benson
CSM
Scott Wehner, Chaparral Energy, and Michael D. Raines and
Roger Freidline, Whiting Oil and Gas Corp
Postle Field
Site of the 24-5 Well
Location of Postle Field
Postle Field
Modified from Johnson (1989)
Morrow Stratigraphic Section
Postle Field – Geologic Setting
Pennsylvanian Morrow (~217Ma) paleogeography. Modified from Bowen and
Weimer (2003).
Study Location in the Hovey Morrow Unit
Net Pay A Sand
Postle Reservoir Parameters
•Depth
•Producing formation
•Average Thickness
•Porosity
•Permeability
•Soi
•Reservoir Temp
•Reservoir pressure Initial
•Reservoir Pressure Current
•Minimum Miscibility Pressure
•Oil Gravity
•Oil FVF orig
•Oil FVF current
•Well spacing
•Area
•Cumulative Production
•OOIP
6100’
Upper Morrow sand
28’ (10-70)
17% (10-23)
50 mD (20-500)
70%
140 F
1630 psi
200 - 2300 - 4500 psi
2100 psi
40 API
1.28
1.20
40 Ac (80-Ac 5-spot inj. patterns)
26000 Ac
120 MMBO (40% OOIP)
~300 MMBO
Motivation
Dry holes drilled
Cross Section
Valley – Fill Sandstones
West
East
6000 ft
Morrow A
6300 ft
The Morrow Sandstone
Binocular Microscope Image
Dipole Sonic Log – Postle Field
Where is the Sand?
Acoustic impedance contrast
between Morrow sandstone and
shale is small (<10%).
The Morrow A is a thin sandstone
reservoir below seismic
resolution.
Average ~45 ft.
4-D, 9-C Seismic Survey
Field Survey Layout
4-D, 9-C Seismic Acquisition Parameters
Type survey
4-D, 9-C (time-lapse)
Subsurface bin size
55 feet X 55 feet
Number of receiver locations
1920
Number of source locations
1920
Total number of source points
5760
Type receiver spread
Stationary: 13,200’ X 13,200’
Instrumentation
I/O System IV, 2 ms sample rate,
4/5 sec. record length
Receiver array
Single 3-C Digital Sensor
(VectorSeis)
Source (P-wave)
Vertical vibrator: 6-100 hz linear
sweep, 8 sec duration, 4 sweeps
Source (S-wave)
Horizontal vibrator: 4-60 hz linear
sweep, 8 sec duration, 4 sweeps,
one source oriented N-S,
one source oriented E-W
Special Thanks to Paragon
Reservoir Characterization Project
P Stack
800
1050
S11 Stack
1500
2000
A
1300
1500
2500
2850
Phase XII
P-Wave Synthetic Seismogram
Well 17-6
Correlation: 73%
18
P-Wave Inline 50 - Baseline
south
north
Lateral Scale 2.5 Miles
19
S11-Wave Synthetic Seismogram
Well 17-6
Correlation: 72%
20
S11 Inline 50 - Baseline
Atoka
Morrow Shale
Morrow A
Lateral Scale 2.5 Miles
21
Postle Seismic Survey
VSP Well Tie
P-Wave Corridor STK March 08 in Inline 45
Tamimi 2009
P-Wave Max Peak Amplitude
Pmig4
Band Pass 30,35
Morrow Peak 20 ms Center
Correlation: 0.42
Wyllie, 2008
S -Impedance
17840
Correlation Coeff
.65
12893
Seismic guided Morrow A Sandstone
(ft)
Multicomponent
guided
Isopach
.73 CC
From Pinto
2011
4000 ft
14
Final Map
With 94% correlation to
Morrow A thickness of well
data. Includes P-P amp,
S11 and S22 amplitudes,
and time-lapse P-P data
From Minaei, 2011
Thickness (ft)
Where is the CO2 Going?
Seismic/Simulation
P-Wave: 1st Monitor-Base
From Heris 2011
From Zerpa 2011
29
Seismic/Simulation
S11-Wave: 1st Monitor-Base
From Zerpa 2011
From Heris 2011
30
Revitalization of HMU, Postle Field, OK
Seismic Acquisition
1958
1961
1974
Start of
Waterflood
May
2007
March Dec.
2008 2008
Start of
CO2 Flood
February
2010
2nd Monitor
Survey
Production history of Postle Field in the RCP area
(Modified from Heris, 2011)
31
Production History & Field Revitalization
Hovey Morrow Unit
100,000
10,000
2588 BOPD
3068
1,000
100
Oil Prod., BOPD
H2O Prod., BWPD
CO2 Prod., Mscf /D
10
H2O Inj., BWPD
CO2 Inj., Mscf /D
1
Jan-05
Jan-06
Jan-07
Jan-08
Jan-09
Jan-10
Jan-11
Jan-12
Conclusions
•The Morrow A Sandstone Reservoir
is better imaged with shear waves
•Reservoir conformance mapping
with shear waves provides the
insight to change or adjust the
current injection-production pattern
to improve CO2 conformance
Reservoir Characterization Project
Phase XII
Thanks to RCP Sponsors of Phases XII and XIII