seismic evidence of vertical fluid migration through faults applications of chimney and fault...
TRANSCRIPT
Seismic Evidence of
Vertical Fluid Migration Through Faults
Applications of Chimney and Fault Detection
Roar Heggland
Statoil
Seismic Examples
Features Associated with Gas Seepage
Gas Seepage From Faults
Chimney and Fault Detection
Charging of Reservoirs Through Faults
Chimneys Above Hydrocarbon Filled Reservoirs
1 km
0.3
0.5
Chimneys
Timeslice Seabed
120 ms 120 ms
3D Seismic Data, Danish North Sea
High Resolution Sparker, Danish North Sea
Carbonate Mounds
1 km
1.0
0.5
3D Seismic Section, Danish North Sea
Carbonate Mounds
Erosion
1 km
700 ms
0.7
1.0
1.5
3D Seismic, Composite Display, Danish North Sea
Carbonate Mounds
Erosion
1 km
700 ms
3D Seismic, Timeslice, Danish North Sea
Carbonate Mounds
1 km
1.0
0.5
0.7
3D Seismic Section, Dansih North Sea
0.8
Depressions
1.0
0.5
1 km3D Seismic Section, Danish North Sea
1 km
700 ms
Depressions
3D Seismic, Timeslice, Danish North Sea
NIGERIA
3D Seismic, Nigeria
5 km
Mud Volcano
Pockmarks
3D Seismic, Azimuth Map, Seabed, Nigeria
1 km
0.8
1.0
Amplitude Map3D Seismic Section, Nigeria
5 km
Mud Volcano
Pockmarks
3D Seismic, Azimuth Map, Seabed, Nigeria
5 km
Mud Volcano
3D Seismic, Amplitude Map, Seabed, Nigeria
5 km
Mud Volcano
3D Seismic, Amplitude Map, Seabed, Nigeria
1 km3D Seismic Section, Nigeria
1.0
1 km3D Seismic, Amplitude Map, Sub Seabed
3D Seismic, Amplitude Map, Sub Seabed 1 km
Chimney Detection
NN
Standard 3D Seismic 3D, Detected Chimneys
Standard 3D Cube
Chimney
Chimney Cube
Neural Network
Seismic Attributes
Classification
1 km
Standard 3D 3D, Detected Faults
Fault Detection
NN
3D, Timeslice, Detected Faults
Depression
1 km
Chimney
Shallow Gas
Carbonate Mounds
Diapir
Chimney ?
3D Seismic Section, Sleipner
0.5
1.0
1 km
Carbonate Mounds0.5
1.0
Chimney ?
3D Seismic Section, Sleipner
3D Seismic, Amplitude Map, Sleipner 1 km
Carbonate Mounds
1 km
Standard 3D Seismic, Sleipner
0.7
1.0
Chimneys
3D, Detected Chimneys
Chimneys
Standard 3D
5 km
0
1
2
3
Eocene Reservoir
Shallow Gas?
3D, Detected Chimneys
5 km
250 ms
1000 ms
2000 ms
3000 ms
Jurassic Faults
Eocene Reservoir
Chimneys
Shallow Gas
Detected Chimneys above Mapped Base Cretaceous
Detected Chimneys above Mapped Base Cretaceous
Gas Chimney Model
1 km
0
1
2
3X
Y
0
1
2
3 1 km
Y
X
1 km
0
1
2
3 1 km
Gas Chimney Model
1
2
3
4
2000 ms
2 km
3D Section, Detected Chimneys Timeslice, Detected Chimneys
Oil Reservoir
1
2
3
4
520 ms
3D Section, Detected Chimneys Timeslice, Detected Chimneys2 km
Oil Reservoir
3
4
1 km3D Gulf of Mexico
1 km3D Gulf of Mexico
3
4
1 km3D Gulf of Mexico
3
4
1 km3D Gulf of Mexico
3
4
1 km3D Gulf of Mexico
3
4
3D Gulf of Mexico
3D Gulf of Mexico
3D Gulf of Mexico
3D Gulf of Mexico
3D Gulf of Mexico
1 km3D Gulf of Mexico
1 km3D Gulf of Mexico
3D Gulf of Mexico
3D Gulf of Mexico
1 km3D Gulf of Mexico
1 km3D Gulf of Mexico
3D Gulf of Mexico
3D Gulf of Mexico
1 km3D Gulf of Mexico
3D Gulf of Mexico
Conclusions
• Chimneys Tie in to Features
Associated with Gas Seepage, Shallow
Gas Accumulations, and Deeper
Hydrocarbon Filled Reservoirs
• Chimneys can Show Possible
Hydrocarbon Pathways into
Reservoirs
• Chimneys are Observed to Tie in to
Faults or Fractures