The Petrel 2016.2 release introduces a new Spectral Analysis Tool (SAT) that allows for rapid and intuitive seismic frequency analysis. SAT enables detailed spectral analysis of 2D and 3D seismic data, attributes, and volumes. It supports visualizing the frequency spectrum of arbitrary polylines, crop volumes, and uses fast Fourier transforms to calculate frequency power spectra. SAT is useful for seismic interpretation, attribute analysis, and quantitative workflows.

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