overview of stark reality plugins for opendtect coming soon to a workstation near you
TRANSCRIPT
Overview ofStark Reality Plugins for
OpendTect
Coming soon to a workstation near you
Surface Segments
• Does not require interpreted horizons.
• Produce attribute volumes
• Horizontal slices contain surface segments which illustrate inherent: – event continuity, – dip magnitude and – stratigraphic relationships
Surface Segments
• Time slice followed by series of thicker surface segments; I would like for it to show a local peak or local trough.
• Follow with slice up or down amount equal to thickness to show how boundaries match.
• Color stack to show fluid change across fault• Color stack to show how things don’t stack
Penobscot 1980 ms
Penobscot 2000 ms
Penobscot 2020 ms
Penobscot 2040 ms
Penobscot 2060 ms
Penobscot 1980 ms
Penobscot 1980 ms
Penobscot 1980 ms
Penobscot 1980 ms
Penobscot 2000 ms
Penobscot 2020 ms
Penobscot 2040 ms
Penobscot 2060 ms
Penobscot 1980 ms
Penobscot 2000 ms
Penobscot 2020 ms
Penobscot 2040 ms
Penobscot 2060 ms
Quick
Dip
Quick Dip
• Uses a fast algorithm for approximating dip
• Produces volumes of:– Inline dip– Crossline dip,– Dip magnitude,– Dip Azimuth,– Dip quality estimates
• Quality estimates often indicate faults, unconformities or other stratigraphic boundaries
3D Volume Classify
• Utilizes RGB color blend concept to produce a classification (facies) volume
• Normally outputs 230 or fewer classes
• Multiple classification orgainzations provided
• Generates an error volume to quality control classification results
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Anomalousness
• Produces an “Anomalousness” attribute volume
• Utilizes 2, 3, or 4 input volumes
• Anomalousness calculated using one of three algorithms
• Optionally outputs histogram volumes
Horizon Toolkit
• A collection of tools to post process interpreted horizons– Closure identification is
one unique tool– Automatic mis-pick and
hole closures – Smoothing methods– Residual structure– Small fault identify
Relative Geologic Time - Basic
• Utilizes pre-interpreted horizons to generate a Relative Geologic Time (RGT) Volume.
• User has control over how ages are assigned to horizons and how ages are interpolated between horizons.
• Useful in combination with Volume Rendering plugin
Temporal Frequency Enhancements
• Implements the “Spin” enhancement method.
• Integer multiples scale the Fourier spectra as shown to left.
• Provided stratigraphic interpretation aids
• Also implements yet to be published method
Teapot Dome Example - spectra
N = 2 N = 3N = 1N = 2 N = 3N = 1
Teapot Dome Example - timeslice
N = 1 N = 2 N = 3
3D wedge modelCrossline Inline
Mapped top and base
3D wedge model
Wedge Isopach
Original Data
Positive Base
Negative Base
Thin Thick
3D wedge model
Wedge Isopach
N = 1+3 Data
Positive Base
Negative Base
Thin Thick
Discontinuity Volumes
• A collection of several unpublished methods to identify discontinuity locations
• Provides alternate to coherency methods
• Discontinuities tend to cluster along faults and unconformities, and be dispersed when data are noisy
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Spectral Decomposition
• Utilizes several methods to separate input data into spectral bands
• Implements the IFS method (Instantaneous Frequency Spectra)– Sum across frequency
approximate absolute value of input trace
– Sum across time approximates Fourier spectra of time window
Input Data
Input Data total Spectrum
5 Hz
STARK Research Proprietary 39
15 Hz
STARK Research Proprietary 40
25 Hz
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35 Hz
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45 Hz
STARK Research Proprietary 43
55 Hz
STARK Research Proprietary 44
65 Hz
STARK Research Proprietary 45
75 Hz
STARK Research Proprietary 46
85 Hz
Relative Geologic Time - Intermediate
• This proposed plugin will convert a DGBES HorizonCube to a Stark Reality RGT Volume and a Stark Reality RGT (Age) Volume to a DGBES HorizonCube
Wheeler Volume Generation
• Utilizes an RGT volume to convert seismic attribute volumes from a vertical axis of travel time (depth) to relative geologic time
• Based on method presented by Stark, 2005.
Multi-Volume Renderer
• GPU based volume rendering of multiple volumes
• Enables real-time volume sculpting when opacity is driven by either RGT or anomalousness volumes
RGT Attributes
• Utilizes an RGT volume to generate age based attributes such as:– Discontinuities,– Fault and unconformity
locations,– Fault throw and heave– Dip magnitude or azimuth– Isopach versus age– Closure volumes, etc.
• See US patent 6,853,922
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Stack Quality Measures
• Tools and workflows to estimate the quality of 3D-prestack migrations using either partial offset (angle) stacks, or pre-stack gathers
• Tools and workflows to correct for some deficiencies in the pre-stack migrations for AVO and structural interpretations
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Beyond Nyquist Stack
• Research project looking for a sponsor
• This technique has potential to improve velocity estimation accuracy and frequency bandwidth recovered from conventionally collected seismic data
• More potential if data collected differently
