Petrel Workflow 1

Initial data. Tobe loaded •

Seismic Volume –

Seismic Horizons (TWT) • • • • •

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• •

Seismic 2D survey

Seismic Velocities (3D Volume) Well folder – – – –

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CARACAS (imported and used to make the velocity model) without editing) HUSTON KOBE PARIS SALT

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

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 Depth Domain.

Following next steps…

Make a Surface In procceses Pane. Click twice in Make/edit surface 2. Add using the blue arrow

1. Select horizon

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), don´t use.

Make a Surface:GEOMETRY TAB

1. Select the seismic data

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

Make a Surface:POST AND PREPROCESSING TABS

ACTIVATE

ACTIVATE SELECT

ACTIVATE

Make a Surface:Well adjustment tab

Other tabs use by default settings

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….

Velocity model

Append as many rows as surfaces

Choose Well Tops Correction Choose surface option and add the twt surface

Select Avg Cube option

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

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

1 select tops and check box

2 go up

Velocity model

Velocity model

activate

Velocity model

Affter click Aply or Ok a report will be generate.

This process run, will take several minutes.

Velocity model

New velocity model will be create in the model pane.

Time-Depth convert Go to seismic volume and click rigth button and 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….

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

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.

From 3D volume in depth

Cell size of model

From now. The results of all this processes will appear in the model pane.

select fault from interpretation folder. Previously converted to depth domain

Add rows for each fault

STEP 2. Activate geological rules. In order to make zones.

add tops

STEP 1 Add rows for each surface

add surface from input pane.Previously converted to depth domain

STEP 3

Select conformable to KOBE surface

In order to improve the accurate change to 20 layers

Structural grids results can be viewed in Models pane

NEXT PHASE. UPSCALE PROPERTIES

Petrophysical properpties from log to model. Seismic attributes from seismic to model. Populate properties ussing Petrophysical facies.