Analysing Geobody Uncertainty

8/13/2019 Analysing Geobody Uncertainty

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Workflow for analysing

Geobod Uncertaint


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Introduction

There is currently no automatic way to

analyze geobody uncertainty inside ofPetrel

workflow

In this case a second nested workflow is

used


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Data requirements

Top and base surfaces for each geobody,

organised into a folder for each body

Copy of original GeoBody property

o er n cases a or crea ng uncer a n ycases

Base case volumetric scenario


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Workflow 1

This workflow is designed to expand the

geobody by x number of grid nodes

This is done on the surfaces which define

The expanded surfaces are looped back

into the geometrical modelling process,

connected volumes is run and yourproperty will change


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Workflow 1Copy of

property ofinterest


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Workflow 1

Geometrical modelling 1 Geometrical modelling 2

NOTE: You can only overwrite in this process, so work on a copy


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Organisation of the input tabInput

surfaces

must beorganised

Workflow will

create these

surfaces for QC


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Expanded geobody left hand side


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Workflow2 Uncertainty Loop

Use the repeat all

calcs on 3d grid

to reproduce

Rebuild the

basecase


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Workflow 2

Make a new folder in the cases tab and

drop into the beginning of the workflow

At the run command in the workflow drop

Make sure the correct property is being

used in the volume calculation


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Report volumetric by Geobody


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Quantifying The Uncertainty

At the moment this is done in the

expansion process by using a variable

The smaller this range the more runs you

This is also controlled by the bin spacing

of the input surfaces, it may be desirable

to resample them to a finer increment


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Conclusion

This appears to be the only way to assess

uncertainty in the geometry of a geobodyat this time within Petrel

sides of the geobody

The Enhancement request has been

submitted

Documents

Analysing Geobody Uncertainty