overview of stark reality plugins for opendtect coming soon to a workstation near you
TRANSCRIPT
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Overview ofStark Reality Plugins for
OpendTect
Coming soon to a workstation near you
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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
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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
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Penobscot 1980 ms
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Penobscot 2000 ms
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Penobscot 2020 ms
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Penobscot 2040 ms
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Penobscot 2060 ms
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Penobscot 1980 ms
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Penobscot 1980 ms
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Penobscot 1980 ms
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Penobscot 1980 ms
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Penobscot 2000 ms
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Penobscot 2020 ms
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Penobscot 2040 ms
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Penobscot 2060 ms
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Penobscot 1980 ms
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Penobscot 2000 ms
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Penobscot 2020 ms
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Penobscot 2040 ms
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Penobscot 2060 ms
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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
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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
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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
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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
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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
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Teapot Dome Example - spectra
N = 2 N = 3N = 1N = 2 N = 3N = 1
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Teapot Dome Example - timeslice
N = 1 N = 2 N = 3
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3D wedge modelCrossline Inline
Mapped top and base
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3D wedge model
Wedge Isopach
Original Data
Positive Base
Negative Base
Thin Thick
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3D wedge model
Wedge Isopach
N = 1+3 Data
Positive Base
Negative Base
Thin Thick
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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
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Input Data
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Input Data total Spectrum
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5 Hz
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STARK Research Proprietary 39
15 Hz
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STARK Research Proprietary 40
25 Hz
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STARK Research Proprietary 41
35 Hz
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STARK Research Proprietary 42
45 Hz
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STARK Research Proprietary 43
55 Hz
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STARK Research Proprietary 44
65 Hz
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STARK Research Proprietary 45
75 Hz
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STARK Research Proprietary 46
85 Hz
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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
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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.
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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
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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