Downhole logging (Cross well Seismic) Applications from ... · Downhole logging (Cross well...
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Downhole logging (Cross well Seismic) Applications from the Oil field to Mining
* Mark of Schlumberger
Shafiq Muhammad Borehole Seismic Domain Champion Australia, New Zealand & PNG
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Agenda
• Introduction
• Acquisition
• Case Studies
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Well Scale
Crosswell measurements target the reservoir
0.001 0.01 0.1 1 10 100 1,000 10,000 100,000
Depth of Investigation (m)
0.01
0.1
1
10
100
1000
Ve
rtic
al R
eso
luti
on
(m
)
Basin Scale
Reservoir Scale
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Resolution scales in reservoir interpretation
After Harris et al. (1995)
Surface Crosswell EM
Logs Core
Increasing vertical resolution
Crosswell Seismic
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Receivers Transmitters
w a t e r
n s
After Ed Stoessel / BP
100 m
Surface Seismic
Crosswell Seismic
opseal
OilNonpay
Format ion
eawater
Perforat io
opseal
OilNonpay
Format ion
eawater
Perforat io
Imaging seismic between wells
Surface Seismic VSP Xwell Seismic
5-120Hz 5-200Hz 30-800Hz (clamped)
100-2000Hz (piezo electric)
Typical Source Frequency Ranges
100 m
Imaging between wells
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• High-resolution reservoir characterization
• Development planning
• 4D monitoring
- IOR/EOR
CSG Applications
Crosswell seismic solutions
Reflectivity Velocity – P&S
Velocity Difference Attenuation
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Agenda
• Introduction
• Acquisition
• Case Studies
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Wireline deployed single-component or 3C Multi-Level Receiver Array
Wireline deployed fluid-coupled or
magnetically clamped
seismic source
Receiver Array Stationed at Position of Deepest Zone
Level Spacing
2.5, 5 or 10 ft
One profile for per source position (profile)
Crosswell seismic acquisition
Receiver Array Moved 50 or 100 ft
Resolution is dependent on: - Frequency - Formation attenuation - Interwell distance
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Acquisition considerations
Well Casing & Separation
Transmitter Well Receiver Well Max Spacing*
Piezo Source Hydrophones/3C 1000m
Any casing Any casing
Clamped Source Hydrophones/3C 2500m
Steel or Magnetic Cr Any
* The exact well separation achievable is obtained from pre-survey modelling
Side View
Well Geometries
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Agenda
• Introduction
• Acquisition
• Case Studies
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Final Crosswell Reflection Image Enlargement
4 – 5 ft. Coal
Seam
High Resolution Imaging of coal seams Case Study
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Conclusions
• Allows operators to drill and target the seams with more accuracy than is
possible with any other technique
• Strengthens reservoir understanding by integrating with other seismic
measurements and frac monitoring (HFM)
• Allows a better understanding of often complex interbeded coal / shale
sequences so the cleanest, highest-producing zones can be targeted
• Provides a detailed view of the natural faulted structures within the coal
• Time lapse crosswell seismic monitoring using velocity clearly indicates
gas/fluid effects from methane extraction
• Xwell Seismic can be used in mining industry too for similar applications.
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Thank You &
Questions