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Stratal Slicing using 3D Model-driven Chronostratigraphy

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Presentation on theme: "Stratal Slicing using 3D Model-driven Chronostratigraphy"— 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 Introduction 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 Decrease of horizon quality Geological situation Shifting lower horizon Shifting upper horizon Stratal-slicing

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 Geo-time ms 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 don’t. 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 Base SSIS plugin

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

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

9 Create Wheeler Cube SSIS > Chronostratigraphy > Select
SSIS > Create Wheeler Cube Select a seismic volume 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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