Stratal Slicing using 3D Model-driven Chronostratigraphy G. de Bruin.
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Transcript of Stratal Slicing using 3D Model-driven Chronostratigraphy G. de Bruin.
![Page 1: Stratal Slicing using 3D Model-driven Chronostratigraphy G. de Bruin.](https://reader033.fdocuments.net/reader033/viewer/2022051014/5517751e55034645368b4dc2/html5/thumbnails/1.jpg)
Stratal Slicingusing 3D Model-driven Chronostratigraphy
G. de Bruin
![Page 2: Stratal Slicing using 3D Model-driven Chronostratigraphy G. de Bruin.](https://reader033.fdocuments.net/reader033/viewer/2022051014/5517751e55034645368b4dc2/html5/thumbnails/2.jpg)
Introduction
Horizon based attribute analysis can reveal sedimentary and structural features
Since horizon-tracking is time-consuming, only the key horizons are typically tracked. Therefore, only a small part of the available data is usually analyzed
![Page 3: Stratal Slicing using 3D Model-driven Chronostratigraphy G. de Bruin.](https://reader033.fdocuments.net/reader033/viewer/2022051014/5517751e55034645368b4dc2/html5/thumbnails/3.jpg)
To analyze more data, horizons are often shifted, which is in most cases only valid in the vicinity of the original horizon
Proportional slicing or stratal slicing enables a more accurate analysis
Introduction
Geological situation Shifting lower horizonShifting upper horizon
Stratal-slicing
Decrease of horizon quality
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Introduction
Stratal slicing or proportional slicing is possible in OpendTect, through the use of the linear interpolation option of the SSIS plugin
Stratal slicing is performed in the chronostratigraphic or Wheeler domain
![Page 5: Stratal Slicing using 3D Model-driven Chronostratigraphy G. de Bruin.](https://reader033.fdocuments.net/reader033/viewer/2022051014/5517751e55034645368b4dc2/html5/thumbnails/5.jpg)
Seismic: Wheeler transformation
Seismic Domain Wheeler Domainm s
Geo-
tim
e
A horizon in the seismic domain is represented by a time-slice in the wheeler domainTherefore: time-slicing in the Wheeler domain is
horizon / stratal slicing in the seismic domain
We analyze the data on time-slices in the Wheeler-domain, simply because it is much easier to display a time-slice than a horizon. Horizons have a geometry, time-slices don’t. Thus more data can be displayed and this is done faster.
![Page 6: Stratal Slicing using 3D Model-driven Chronostratigraphy G. de Bruin.](https://reader033.fdocuments.net/reader033/viewer/2022051014/5517751e55034645368b4dc2/html5/thumbnails/6.jpg)
Workflow
Track or import 2 horizons
Calculate chronostratigraphy
Create Wheeler volume
Load Volume in Wheeler scene
Required Software: OpendTect Base SSIS plugin
![Page 7: Stratal Slicing using 3D Model-driven Chronostratigraphy G. de Bruin.](https://reader033.fdocuments.net/reader033/viewer/2022051014/5517751e55034645368b4dc2/html5/thumbnails/7.jpg)
Track 2 horizons
http://www2.opendtect.org/rel/html/index.html
1. Track 2 horizons*
2. Make sure to fill all holes
3. Check for crossing horizons
* Consult OpendTect user-documentation
![Page 8: Stratal Slicing using 3D Model-driven Chronostratigraphy G. de Bruin.](https://reader033.fdocuments.net/reader033/viewer/2022051014/5517751e55034645368b4dc2/html5/thumbnails/8.jpg)
Calculate Chronostratigraphy
1. Read the 2 horizons
2. Set both to isochronous
3. Set spacing
4. Give a name
SSIS > Chronostratigraphy > new
![Page 9: Stratal Slicing using 3D Model-driven Chronostratigraphy G. de Bruin.](https://reader033.fdocuments.net/reader033/viewer/2022051014/5517751e55034645368b4dc2/html5/thumbnails/9.jpg)
Create Wheeler Cube
SSIS > Chronostratigraphy > Select
SSIS > Create Wheeler Cube
1. Select a seismic volume
2. Give a name
![Page 10: Stratal Slicing using 3D Model-driven Chronostratigraphy G. de Bruin.](https://reader033.fdocuments.net/reader033/viewer/2022051014/5517751e55034645368b4dc2/html5/thumbnails/10.jpg)
Load Volume in Wheeler
SSIS > Add Wheeler Scene
Add Volume in Wheeler Scene
![Page 11: Stratal Slicing using 3D Model-driven Chronostratigraphy G. de Bruin.](https://reader033.fdocuments.net/reader033/viewer/2022051014/5517751e55034645368b4dc2/html5/thumbnails/11.jpg)
Time-slice through volume
Drag the time-slice for stratal slicing