Spectral analysis

1. Petrel 2016.2: Spectral Analysis Tool
Surender Manral, Product Champion, Petrel Geophysics
Ivan Salazar, Senior Reservoir Geophysicist

2. Spectral Analysis Tool
 Rapid and intuitive seismic frequency analysis
Near Angle Stack
Mid Angle Stack
Far Angle Stack

3.  Spectral Analysis Tool (SAT) is available in Petrel 2016.2
 Extending Inspector spectrum capabilities for detailed spectral analysis through SAT
 Spectral Analysis Tool is enabled with any of following license:
– Geoscience Core + Seismic Interpretation
– Combined Core + Seismic Interpretation
– Geophysics Core
 Spectral Analysis Tool is available for basic seismic interpretation, attribute analysis and
advance quantitative interpretation workflows
Spectral Analysis Tool

4.  Time domain supported data types:
– 2D Seismic lines
– 3D Seismic Cubes
– Cropped Volumes
– Virtual Attributes
– Inline / Xline
– Random line
Spectral Analysis Tool
2D lines with specific
frequency

5.  Supports frequency spectrum for arbitrary polyline
 Multiple frequency spectrum display from multiple
cubes or intersections
 Spectrum from multiple 2D lines can be displayed
 Crop volume can be used to define a VOI
 Spectrum will update once crop volume is moved
Spectral Analysis Tool
Frequency Spectrum of Arbitrary Polyline
Arbitrary Polyline

6.  Fast Fourier Transform for calculating the frequency power spectrum
 Flexible taper controls
– Bartlett
– Cosine
– Hamming
– Hanning (Raised-Cosine)
– Papoulis
 Define AOI & VOI using a crop volume
Spectral Analysis Tool
Crop Volume
Frequency Spectrum of Crop Volume

7.  Create, save, delete or analyze different scenarios
using the ‘case’
 Dynamic update of spectrum using the ‘Auto update’
feature
 Interactive read out (frequency and power), magnify a
selected area, pan etc.
 Output as a spread sheet using the ‘Copy active
spectrum to clipboard’
 Launch SAT from 3D Window, Interpretation Window,
Well Section Window, Input pane
Spectral Analysis Tool
1. Create case
2. Rename, delete or navigate
3. Auto-update
4. Tapers
5. Magnify
6. Copy bitmap
7. Copy values from active spectrum
8. Read-outs

9. Frequency Spectrum of Wedge Models
Spectral Analysis Tool
Synthetic Data
Wedge synthetic
Filtered Wedge synthetic (Filter: 05,12,50,100)

10. Spectral Analysis Tool
Synthetic Data
Frequency Decomposition of the Wedge Model using GSD
Wedge synthetic
RGB Blended Wedge (10Hz, 20Hz, 30Hz)

11. Frequency spectrum of Xline

13.  Spectral analysis is key for numerous workflows
– Prestack Interpretation workflows
– 4D Seismic workflows
– Spectral Decomposition
– Attribute Analysis
Spectral Analysis Tool

14.  Prestack Interpretation workflows
– Generation of angle stack is critical for
inversion workflows
– SAT allows user a careful analysis of
frequency content of individual stacks
– Analyze the impact of prestack data
conditioning on frequency content of the
angle stacks
Spectral Analysis Tool