geomage presentation
TRANSCRIPT
![Page 1: Geomage Presentation](https://reader035.vdocuments.net/reader035/viewer/2022070321/558d3dccd8b42a0b318b4673/html5/thumbnails/1.jpg)
MultiFocusing© Technology
![Page 2: Geomage Presentation](https://reader035.vdocuments.net/reader035/viewer/2022070321/558d3dccd8b42a0b318b4673/html5/thumbnails/2.jpg)
Content
• MultiFocusing© theory
• Enhanced prestack gathers
• MultiFocusing© vs. conventional processing - examples around the globe
• Diffraction
![Page 3: Geomage Presentation](https://reader035.vdocuments.net/reader035/viewer/2022070321/558d3dccd8b42a0b318b4673/html5/thumbnails/3.jpg)
Conventional Processing MultiFocusing© Processing
The Image is the message……
![Page 4: Geomage Presentation](https://reader035.vdocuments.net/reader035/viewer/2022070321/558d3dccd8b42a0b318b4673/html5/thumbnails/4.jpg)
MultiFocusing imagingNMO/time and depth migration imaging
Wave front parameters analysis
Stacking Velocity analysis
Pre-stack seismic data
MultiFocusing© CMP
![Page 5: Geomage Presentation](https://reader035.vdocuments.net/reader035/viewer/2022070321/558d3dccd8b42a0b318b4673/html5/thumbnails/5.jpg)
Real geology is not simple
![Page 6: Geomage Presentation](https://reader035.vdocuments.net/reader035/viewer/2022070321/558d3dccd8b42a0b318b4673/html5/thumbnails/6.jpg)
MultiFocusing© theory
![Page 7: Geomage Presentation](https://reader035.vdocuments.net/reader035/viewer/2022070321/558d3dccd8b42a0b318b4673/html5/thumbnails/7.jpg)
Common Reflection / Depth Point Stacking
SHOTS RECEIVERS
REFLECTOR
COMMON REFLECTING POINT
2
220 V
xtt
Conventional stack
![Page 8: Geomage Presentation](https://reader035.vdocuments.net/reader035/viewer/2022070321/558d3dccd8b42a0b318b4673/html5/thumbnails/8.jpg)
v+
+
+
vv
vv
v
vv
+
+
+
Shot coordinate
Rec
eive
r co
ordi
nate
++ +
++
+
++
Normal move out equation is valid when only traces with equal distance to shot and receiver are stacked within a CDP gather (red)
CMP position
CMP traces
MF traces++
Conventional stack
![Page 9: Geomage Presentation](https://reader035.vdocuments.net/reader035/viewer/2022070321/558d3dccd8b42a0b318b4673/html5/thumbnails/9.jpg)
MultiFocusing time correction formula is valid for arbitrary subsurface structure and for arbitrary source-receiver configurations
0
22 sin2)(
V
RXXRR ss
0
22 sin2)(
V
RXXRR rr
source and receiver positions
are the radii of curvature of the wavefronts
rs XandX
is the emergence angle of the normal ray
),,( CEECRE RRR
),,,,( 0 rsCRE XXXR focusing parameter
MultiFocusing move-out correction
![Page 10: Geomage Presentation](https://reader035.vdocuments.net/reader035/viewer/2022070321/558d3dccd8b42a0b318b4673/html5/thumbnails/10.jpg)
CRE Radius & CEE Radius and emergence angle b 2D MultiFocusing – 3 parameters
Rcre – radius of curvature of common reflection elementRcee – radius of curvature of reflected surface
![Page 11: Geomage Presentation](https://reader035.vdocuments.net/reader035/viewer/2022070321/558d3dccd8b42a0b318b4673/html5/thumbnails/11.jpg)
3D MultiFocusing - 8 parameters
![Page 12: Geomage Presentation](https://reader035.vdocuments.net/reader035/viewer/2022070321/558d3dccd8b42a0b318b4673/html5/thumbnails/12.jpg)
The MF sums the data along the MF stacking surface
MF stacking surface
MultiFocusing stack
![Page 13: Geomage Presentation](https://reader035.vdocuments.net/reader035/viewer/2022070321/558d3dccd8b42a0b318b4673/html5/thumbnails/13.jpg)
v
+
+ ++
v
+
vv
vv
v
vv
++
Shot coordinate
Rec
eive
r co
ordi
nate
++ +
++
+
++
+ CMP tracesMF traces+
CMP position
+
+
++
+
+++++
+ + + ++
+
++
+++
Normal move out equation is valid when only traces with equal distance to shot and receiver are stacked within a CDP gather.Nearby traces (green) can not be used but are utilized by our MultiFocusing™ methodology.
MultiFocusing stack
![Page 14: Geomage Presentation](https://reader035.vdocuments.net/reader035/viewer/2022070321/558d3dccd8b42a0b318b4673/html5/thumbnails/14.jpg)
X0Xi
t0-Δt
t0
t0+Δt
TIM
E
Rcre β
Wavefront
z0
z0-Δz
z0+ΔzX0
Reflector
Xi
X
DE
PT
H
Velocity corridor picking
![Page 15: Geomage Presentation](https://reader035.vdocuments.net/reader035/viewer/2022070321/558d3dccd8b42a0b318b4673/html5/thumbnails/15.jpg)
Conventional stacksp1 sp2 sp3 sp4 sp5
sp1 sp2 sp3 sp4 sp5
![Page 16: Geomage Presentation](https://reader035.vdocuments.net/reader035/viewer/2022070321/558d3dccd8b42a0b318b4673/html5/thumbnails/16.jpg)
Geomage MultiFocusing stacksp1 sp2 sp3 sp4 sp5
sp1 sp2 sp3 sp4 sp5
![Page 17: Geomage Presentation](https://reader035.vdocuments.net/reader035/viewer/2022070321/558d3dccd8b42a0b318b4673/html5/thumbnails/17.jpg)
Synthetic horizontal reflector
Rugged Topography – synthetic example
![Page 18: Geomage Presentation](https://reader035.vdocuments.net/reader035/viewer/2022070321/558d3dccd8b42a0b318b4673/html5/thumbnails/18.jpg)
Conventional
MultiFocusing©
Rugged Topography – real data
![Page 19: Geomage Presentation](https://reader035.vdocuments.net/reader035/viewer/2022070321/558d3dccd8b42a0b318b4673/html5/thumbnails/19.jpg)
Anisotropy study begins with scanning for 5 parameters
MultiFocusing anisotropy
![Page 20: Geomage Presentation](https://reader035.vdocuments.net/reader035/viewer/2022070321/558d3dccd8b42a0b318b4673/html5/thumbnails/20.jpg)
V Slow V Fast V Azimuth
Anisotropy attributes
![Page 21: Geomage Presentation](https://reader035.vdocuments.net/reader035/viewer/2022070321/558d3dccd8b42a0b318b4673/html5/thumbnails/21.jpg)
Anisotropy cubes
![Page 22: Geomage Presentation](https://reader035.vdocuments.net/reader035/viewer/2022070321/558d3dccd8b42a0b318b4673/html5/thumbnails/22.jpg)
Enhanced Pre-Stack Gathers
![Page 23: Geomage Presentation](https://reader035.vdocuments.net/reader035/viewer/2022070321/558d3dccd8b42a0b318b4673/html5/thumbnails/23.jpg)
The MF sums the data along the green surface. The partial MF sums the data around the specified point (point A). The partial MF is shown in red coincides locally with the MF stacking surface.
MF stacking surface
A
Enhanced MultiFocusing gathers
![Page 24: Geomage Presentation](https://reader035.vdocuments.net/reader035/viewer/2022070321/558d3dccd8b42a0b318b4673/html5/thumbnails/24.jpg)
Original Gather MF Enhanced Gather
Enhanced MultiFocusing gathers
![Page 25: Geomage Presentation](https://reader035.vdocuments.net/reader035/viewer/2022070321/558d3dccd8b42a0b318b4673/html5/thumbnails/25.jpg)
MF Enhanced Gather after MF-MoveOutMF Enhanced Gather
MultiFocusing – enhanced pre-stack gathers
![Page 26: Geomage Presentation](https://reader035.vdocuments.net/reader035/viewer/2022070321/558d3dccd8b42a0b318b4673/html5/thumbnails/26.jpg)
Original gathers
![Page 27: Geomage Presentation](https://reader035.vdocuments.net/reader035/viewer/2022070321/558d3dccd8b42a0b318b4673/html5/thumbnails/27.jpg)
MultiFocusing enhanced gathers
![Page 28: Geomage Presentation](https://reader035.vdocuments.net/reader035/viewer/2022070321/558d3dccd8b42a0b318b4673/html5/thumbnails/28.jpg)
MultiFocusing© vs. conventional processing
Examples around the globe
![Page 29: Geomage Presentation](https://reader035.vdocuments.net/reader035/viewer/2022070321/558d3dccd8b42a0b318b4673/html5/thumbnails/29.jpg)
• Increases poor signal/noise ratio
• Resolves signal over rugged topography
• Resolves curved reflectors/ dipping events
• Resolves variable velocity
• Azimuth preservation
• Use diffraction to detect natural fracturing
The MultiFocusing method - advantages
![Page 30: Geomage Presentation](https://reader035.vdocuments.net/reader035/viewer/2022070321/558d3dccd8b42a0b318b4673/html5/thumbnails/30.jpg)
Conventional processing MultiFocusing processing
Reprocessing of vintage seismic data
![Page 31: Geomage Presentation](https://reader035.vdocuments.net/reader035/viewer/2022070321/558d3dccd8b42a0b318b4673/html5/thumbnails/31.jpg)
Reprocessing of seismic data in foothills
Conventional processing MultiFocusing processing
![Page 32: Geomage Presentation](https://reader035.vdocuments.net/reader035/viewer/2022070321/558d3dccd8b42a0b318b4673/html5/thumbnails/32.jpg)
Reprocessing of seismic data in Colombia
Conventional processing MultiFocusing processing
![Page 33: Geomage Presentation](https://reader035.vdocuments.net/reader035/viewer/2022070321/558d3dccd8b42a0b318b4673/html5/thumbnails/33.jpg)
Reprocessing of seismic data in Colombia
Conventional processing MultiFocusing processing
![Page 34: Geomage Presentation](https://reader035.vdocuments.net/reader035/viewer/2022070321/558d3dccd8b42a0b318b4673/html5/thumbnails/34.jpg)
Reprocessing of seismic data in Argentina
Conventional processing MultiFocusing processing
![Page 35: Geomage Presentation](https://reader035.vdocuments.net/reader035/viewer/2022070321/558d3dccd8b42a0b318b4673/html5/thumbnails/35.jpg)
Increasing vertical Resolution (~ 25% in frequency bandwidth)
Conventional processing MultiFocusing processing
![Page 36: Geomage Presentation](https://reader035.vdocuments.net/reader035/viewer/2022070321/558d3dccd8b42a0b318b4673/html5/thumbnails/36.jpg)
Salt body
Salt dome body contouring
![Page 37: Geomage Presentation](https://reader035.vdocuments.net/reader035/viewer/2022070321/558d3dccd8b42a0b318b4673/html5/thumbnails/37.jpg)
Better multiple attenuation
![Page 38: Geomage Presentation](https://reader035.vdocuments.net/reader035/viewer/2022070321/558d3dccd8b42a0b318b4673/html5/thumbnails/38.jpg)
PSDM Post stack depth migrated MF
![Page 39: Geomage Presentation](https://reader035.vdocuments.net/reader035/viewer/2022070321/558d3dccd8b42a0b318b4673/html5/thumbnails/39.jpg)
PSDM Post stack depth migrated MF
![Page 40: Geomage Presentation](https://reader035.vdocuments.net/reader035/viewer/2022070321/558d3dccd8b42a0b318b4673/html5/thumbnails/40.jpg)
PSDM Post stack depth migrated MF
Depth 3D processing
![Page 41: Geomage Presentation](https://reader035.vdocuments.net/reader035/viewer/2022070321/558d3dccd8b42a0b318b4673/html5/thumbnails/41.jpg)
Conventional processing MultiFocusing processing
Eastern Europe (fold 32) – 1920 ms
![Page 42: Geomage Presentation](https://reader035.vdocuments.net/reader035/viewer/2022070321/558d3dccd8b42a0b318b4673/html5/thumbnails/42.jpg)
500 ms
Conventional processing MultiFocusing processing
![Page 43: Geomage Presentation](https://reader035.vdocuments.net/reader035/viewer/2022070321/558d3dccd8b42a0b318b4673/html5/thumbnails/43.jpg)
600 ms
Conventional processing MultiFocusing processing
![Page 44: Geomage Presentation](https://reader035.vdocuments.net/reader035/viewer/2022070321/558d3dccd8b42a0b318b4673/html5/thumbnails/44.jpg)
Diffraction
![Page 45: Geomage Presentation](https://reader035.vdocuments.net/reader035/viewer/2022070321/558d3dccd8b42a0b318b4673/html5/thumbnails/45.jpg)
A diffraction occurs when a wave encounters an obstacle.
In classical physics, the diffraction phenomenon is described as the apparent bending of waves around small obstacles and the spreading out of waves past small openings.
Research suggests that this can be used to map fractures in the sub-surface from seismic.
Wave front
Obstacle
Diffraction - definition
![Page 46: Geomage Presentation](https://reader035.vdocuments.net/reader035/viewer/2022070321/558d3dccd8b42a0b318b4673/html5/thumbnails/46.jpg)
How do we identify discontinuities?
![Page 47: Geomage Presentation](https://reader035.vdocuments.net/reader035/viewer/2022070321/558d3dccd8b42a0b318b4673/html5/thumbnails/47.jpg)
X0
О
D
Rcee
О
X0
β
Rcre
β
Reflection interface
MultiFocusing ray scheme
![Page 48: Geomage Presentation](https://reader035.vdocuments.net/reader035/viewer/2022070321/558d3dccd8b42a0b318b4673/html5/thumbnails/48.jpg)
О
X0
β
Rcre=Rcee
0
22 sin2
V
RXRXR ss 0
22 sin2
V
RXRXR RR
MultiFocusing scheme for diffractions
![Page 49: Geomage Presentation](https://reader035.vdocuments.net/reader035/viewer/2022070321/558d3dccd8b42a0b318b4673/html5/thumbnails/49.jpg)
Fractures
Numerical model
![Page 50: Geomage Presentation](https://reader035.vdocuments.net/reader035/viewer/2022070321/558d3dccd8b42a0b318b4673/html5/thumbnails/50.jpg)
Size of fracture: 1 x 0.3 meter
Fracture intensity
![Page 51: Geomage Presentation](https://reader035.vdocuments.net/reader035/viewer/2022070321/558d3dccd8b42a0b318b4673/html5/thumbnails/51.jpg)
GMF Stack
![Page 52: Geomage Presentation](https://reader035.vdocuments.net/reader035/viewer/2022070321/558d3dccd8b42a0b318b4673/html5/thumbnails/52.jpg)
GMF Post-STM
![Page 53: Geomage Presentation](https://reader035.vdocuments.net/reader035/viewer/2022070321/558d3dccd8b42a0b318b4673/html5/thumbnails/53.jpg)
GMF Diffraction Stack
![Page 54: Geomage Presentation](https://reader035.vdocuments.net/reader035/viewer/2022070321/558d3dccd8b42a0b318b4673/html5/thumbnails/54.jpg)
GMF Diffraction Post-STM
![Page 55: Geomage Presentation](https://reader035.vdocuments.net/reader035/viewer/2022070321/558d3dccd8b42a0b318b4673/html5/thumbnails/55.jpg)
Offshore 2D – Mediterranean Basin
Geomage MultiFocusing – structure stack
![Page 56: Geomage Presentation](https://reader035.vdocuments.net/reader035/viewer/2022070321/558d3dccd8b42a0b318b4673/html5/thumbnails/56.jpg)
Offshore 2D - Mediterranean Basin
Geomage MultiFocusing – Diffraction stack
![Page 57: Geomage Presentation](https://reader035.vdocuments.net/reader035/viewer/2022070321/558d3dccd8b42a0b318b4673/html5/thumbnails/57.jpg)
Offshore 2D - Mediterranean Basin
MultiFocusing – migrated diffraction stack
![Page 58: Geomage Presentation](https://reader035.vdocuments.net/reader035/viewer/2022070321/558d3dccd8b42a0b318b4673/html5/thumbnails/58.jpg)
Offshore 2D - Mediterranean Basin
MultiFocusing – migrated diffraction stack
Colored on migrated MF stack
![Page 59: Geomage Presentation](https://reader035.vdocuments.net/reader035/viewer/2022070321/558d3dccd8b42a0b318b4673/html5/thumbnails/59.jpg)
Example – 3D diffraction volume
![Page 60: Geomage Presentation](https://reader035.vdocuments.net/reader035/viewer/2022070321/558d3dccd8b42a0b318b4673/html5/thumbnails/60.jpg)
Thank You