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Stratal Slicing using 3D Model-driven Chronostratigraphy G. de Bruin.

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Presentation on theme: "Stratal Slicing using 3D Model-driven Chronostratigraphy G. de Bruin."— Presentation transcript:

1 Stratal Slicing using 3D Model-driven Chronostratigraphy G. de Bruin

2 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

3 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 horizon Shifting upper horizon Stratal-slicing Decrease of horizon quality

4 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

5 Seismic: Wheeler transformation Seismic Domain Wheeler Domain ms Geo-time A horizon in the seismic domain is represented by a time-slice in the wheeler domain Therefore: 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 dont. Thus more data can be displayed and this is done faster.

6 Workflow Track or import 2 horizons Calculate chronostratigraphy Create Wheeler volume Load Volume in Wheeler scene Required Software: OpendTect BaseSSIS plugin

7 Track 2 horizons 1.Track 2 horizons* 2.Make sure to fill all holes 3.Check for crossing horizons * Consult OpendTect user-documentation

8 Calculate Chronostratigraphy 1.Read the 2 horizons 2.Set both to isochronous 3.Set spacing 4.Give a name SSIS > Chronostratigraphy > new

9 Create Wheeler Cube SSIS > Chronostratigraphy > Select SSIS > Create Wheeler Cube 1.Select a seismic volume 2.Give a name

10 Load Volume in Wheeler SSIS > Add Wheeler Scene Add Volume in Wheeler Scene

11 Time-slice through volume Drag the time-slice for stratal slicing

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