Petrel Workflow 1

5/20/2018 Petrel Workflow 1

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Initial data. Tobe loaded

Seismic Volume Seismic Horizons (TWT)

CARACAS (imported and used to make the velocity model) without editing)

HUSTON

KOBE

PARIS

SALT

Seismic 2D survey

Seismic Velocities (3D Volume)

Well folder Well heads (well location)

Well deviation (Flourite Well has a different file structure, be carefull)

Well log (GR, DT, etc.) Some GR with anormal low values, multiply by 10 or 16.5 and check.

Checkshoot (for each well)

Well Tops folder (TWTpicked and DEPTH (ftUS)) CARACAS

DALLAS

HUSTON (will be top of model)

HUSTON BASE

KOBE (will be Bottom of model)

SALT


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Velocity model. Main steps.

Make surface for each imported horizon CARACAS, HUSTON,KOBE, PARIS AND SALT. No seismic reinterpretation is neccesary.

How to create a surface: Surface/edit processes pane.

Generate Velocity model from sufaces (TWT) and Well tops.

Velocity model from geophysics procceses directory

With generated velocity model convert 3D volume to DepthDomain.

Following next steps


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Make a Surface

In procceses Pane. Click twice in

Make/edit surface

1. Select horizon

2. Add using the blue arrow


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Make a Surface: INPUT DATA

If result Surface is in blank

and name box unchecked.

Petrel will write the same name for

resulting surface

If we had an area of interest to make

a boundary surface, use it (polygon

data).

In this case (to mak evelocity model),

dont use.


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1. Select the seismic data

1. Click in get all set.. . To append the geometry information.

Make a Surface:GEOMETRY TAB


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ACTIVATE

Make a Surface:POST AND PREPROCESSING TABS

ACTIVATE

ACTIVATE

SELECT


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Make a Surface:Well adjustment tab

Other tabs use

by default

settings


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Make a Surface:Resulted surface

New surface appears into the input pane. Remember that we are working in Time domain yet.

Create rest of them.


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Velocity model

Choose surface option and add the twt surface

Append as many rows as surfaces

Choose Well Tops Correction

Select Avg Cube option


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Velocity model

First of all.Go to Well Folder and click (right button) and select

Settings.


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Velocity modelFirst of all.

Go to Well Folder and click (right button) and select

Settings.

1 select tops and check box

2 go up


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Velocity model

activate


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Velocity model

Affter click Aply or Ok a report will be generate.

This process run, will take several minutes.


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Velocity model

New velocity model

will be create in themodel pane.


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Time-Depth convert

Go to seismic volume and click rigth buttonand select Domain convert by active velocity

model.

Use this way to seismic surfaces-horizons

conversion. In those cases the depth domain

will be storaged in the attributes of

surfaces.


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Velocity model

Open a 3D window in TVD Domain and check the converted surfaces.


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Working with depth data

From now. We can work with seismic volume in Depth Domain directly.

Remarks: in order to get the maximum workflow ,no QC has been carried out.

In the zip file, two depth surfaces and boundary polygons can be found.

Huston surfaces and Kobe surfaces.

NEXT STEP: DEFINE MODEL GEOMETRY.

In processes pane. Click twice on

Geometry definition process.


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From 3D

volume in

depth

Cell size of

model


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From now. The results of all this processes will appear

in the model pane.


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select fault from interpretation folder.

Previously converted to depth domain

Add rows for each fault


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add surface from input pane.Previously

converted to depth domainAdd rows for each surface

STEP 1

STEP 2. Activate

geological rules. In order

to make zones.

STEP 3

add tops


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Select conformable to KOBE surface


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In order to improve the accurate

change to 20 layers


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Structural grids results can be viewed in Models pane


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NEXT PHASE. UPSCALE PROPERTIES

Petrophysical properpties from log to model.

Seismic attributes from seismic to model.

Populate properties ussing Petrophysical facies.

Documents

Petrel Workflow 1