Geoconvention 2011 by Kelli Meyer
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Transcript of Geoconvention 2011 by Kelli Meyer
Osum Oil Sands Corp |
Using a Seismically-Derived Density Volume and Facies Characterization to Optimize Thermal Well Trajectories in the Clearwater Formation, Alberta
Kelli Meyer*Osum Oil Sands Corp.
Robert McGroryTerraWRX Exploration Consultants Ltd.
Shawna ChristensenThrondson Energy Ltd.
Intro Map
• Cold Lake Oil Sands• Clearwater and
Grand Rapids
Reservoirs• Planned SAGD and
horizontal CSS
Importance of Well Placement
Thermal Net Pay
>27% porosity>10 ohm.m
•Taiga Clearwater net pay averages 12m and is laterally continuous
Importance of Well Placement
•Taiga Clearwater net pay averages 12m and is laterally continuous
•Well placement at the base of the reservoir maximizes producible pay
6.4 kmWest East
M2S2
S1
M1
S3
Importance of Well Placement
•Taiga Clearwater net pay averages 12m and is laterally continuous
•Well placement at the base of the reservoir maximizes producible pay
•Accurate mapping of the base of the reservoir using seismic, core and logs is key to optimal well placement
IntegratedModel
IntegratedModel
SeismicInversion
SeismicInversion
Rock Physics
Rock Physics
3D GeologicModel
3D GeologicModel
Velocity Model
Velocity Model
SeismicHorizons
SeismicHorizons
StratigraphicModel
StratigraphicModel
Facies Model
Facies Model
LogsCore DataGrain Size
LogsCore DataGrain Size
SAGD WellTrajectories
SAGD WellTrajectories
Dataset
• 60 delineation wells-logged and cored-5 wells FMI-6 wells dipole sonic-viscosity measurements-grain sizes, XRD, SEM
• 32.5km2 3D seismic• 5 - 2D seismic lines
• Model software: -Petrel TM
-Hampson-Russell TM
• Facies analysis, 3D geological model, reservoir simulations and seismic inversion
Reservoir Summary
Phase 1 SAGD Pads
Additional SAGD Pads
CSS Pads
S1 Gas Cap
Basal Water
M1 > 1m
Clearwater Shale
regional caprock
Clearwater Sand 1
upper sand
Clearwater Mud 1
bioturbated mudstone
Clearwater Sand 2
lower sand
cemented nodule
Clearwater Mud 2
Interlaminated sands and muds
Lost core
Net
Pay
(12
m)
F2b
Facies
F2b
F1 (Shoreface): Vf-f ss, homogeneous, hz-low angle parallel lams, low bioturbation = RESERVOIR
F3a (Distal Delta Front): 50% vf-f sandstone and 50% sandy medium gray mudstone interbeds, moderate bioturbation = M2
Cemented
F2b (Distal Delta Front): Ss,with 10-50% mudstone, hz parallel lams, low-mod. bioturbation = RESERVOIR
F4a (Distal Pro-Delta): med. gray mudstone intermixed with 50% vf ss, extensive bioturbation = M1
Seismic Integration
Hz
Porosity
Well Synthetic Tie: example 2-5-66-1 W4M
CC > 70%CC > 70%
Near Angle StackNear Angle StackSyntheticSyntheticSonicSonicDensityDensityGamma RayGamma Ray
Zone of InterestZone of Interest
Velocity Modelfor tying wells and surfaces
Velocity model converts horizons and inverted
models from time to depth
Pre-stack Seismic Inversion
Seismic Inversion Results
CW ShaleCWS1
CWS2
CWM2
CWM1
Inversion Error QC
Excellent correlationTesting control logs against inverted volume
GeologicModel
GeophysicalModel
West East06-26-65-02W4
VE=10x
VE=10x 3D Petrel model of 120 Lower Grand Rapids and Clearwater well trajectories with seismic and inverted density volumes
Conclusions
• Seismic inversion helps visualize basal nodules and middle mudstones
• The fully integrated model allows;-predictable reservoir facies-minimization of stranded pay zones-optimized placement of SAGD wellbores
• The fully integrated model allows rapid updating and adaptability as new wells are drilled and 4D seismic is acquired
• This result will provide input to modelling steam chamber growth• Planning of infill wells• Further work on fluid contacts and placement of Lower Grand
Rapids wells above basal water
Future Applications
Acknowledgements
• Ken Gray,Senior Staff Geophysicist
• Jen Russel-Houston,
Manager, Geosciences
• Elizabeth Earl
• Hartmut Janssen & Peter Carey
Stratigraphy
Clearwater Shale
Lower Grand Rapids Shoreface
Stacked Clearwater Shorefaces
Lower Grand Rapids
Channel Fill
Lower Grand Rapids Lateral Accretion
Very Fine to Fine Sand
Fine to Medium Sand
Intermixed Sand, Silt and Shale – Non Reservoir
Shale
The Clearwater Formation is laterally continuous across the Taiga field
West East
S3S2S1