Ex15_MakeContact

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Table of ContentsDEFINING FLUID CONTACTS..........................................................................................................2

Exercise Overview:....................................................................................................................2

A) CREATEANEW CONTACT SET..................................................................................................2Comment................................................................................................................................... 3B) VISUALIZINGTHE CONTACTSONA SURFACE..............................................................................3

Exercise Steps........................................................................................................................... 3Comments................................................................................................................................. 3

C) VISUALIZINGTHECONTACTSIN MAPVIEW..................................................................................4Exercise Steps........................................................................................................................... 4

D) VISUALIZECONTACTSASPROPERTIESIN 3D..............................................................................4Exercise Steps........................................................................................................................... 4

Petrel Introduction Course P2002 (v.7/02) Page 1


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Defining Fluid Contacts

Volumes are most commonly calculated in the Volume

Calculation Process step. Any hydrocarbon contacts to beused in the Volume Calculation process must be pre-definedin the Make Contacts process step. The aim of the MakeContacts process is to facilitate the use of contacts inside a3D grid. Any types of contacts can be defined as Oil/Gas,Oil/Water, Oil up to, Gas down to, etc. These contacts can beconstant depth levels or represented by a 2D grid (surface)and they may be different for each zone and segment. Theuser has the option of using the same contact for all zonesand segments, different contacts for each segment and/ordifferent contacts for each zone.

In this exercise you will generate a contact set to be used in

the Volume Calculation Module.

Exercise Overview:

A) Create a new contact set

B) Visualize the contacts on a surface

C) Visualize contacts in a map window

D) Visualize contacts as properties in 3D

A) Create a new Contact SetAfter having built a PETREL 3D grid and prior to running the volume calculation, the variouscontacts should be defined in the Make Contactsprocess.

Several sets of contacts can be defined and each Contact Set can contain a number of differentcontact types. All Contact Sets will be stored under a folder called Fluid Contacts in the PetrelExplorer Models tab.

The Contact Set can be created based on a constant depth value or a surface. If a surface is usedas an input for the contact, it has to exist in the PETREL Explorer window. Any type of surface canbe used as an input.

The user has the option of using the same contact for all zones and segments, different contacts

for each segment and/or different contacts for each zone.

Exercise Steps

1. Double click on the Make Contacts Process in the Process Diagram.

2. Create one Oil/Gas and one Oil/Water contact. Use the contact levels listed below. Insertthese numbers into the cell in the lower part of the window for both contacts. Define bothcontacts before pressing Apply.

3. A Fluid Contacts folder will be created in the active 3D grid and the contacts will be placedunder this folder.

4. Oil/Gas: -1880m

5. Oil/Water: -2010m

6. Click OK and the Fluid Contacts folderwith the new set of contacts will appear in the modeltab below the segment filter.



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Comment

To get a new contact into your model, press the Add New Contacticon

. This contact will be named General Contact. Highlight this General Contactand selectContact Type in the pull down menu. To give the contact a name, go to the Contact Name cell

and write the name of the contact. If you want to remove a default contact highlight it and use

the red cross icon .

If your contacts differ between each zone of the model, deselect the

Same for all zones checkbox.

If your contacts need to be specified for each segment, deselect the

Same for all segments checkbox.

B) Visualizing the Contacts on a Surface

The user has different options for visualizing thecontacts in 2D, 3D or in map view.

The contacts can be visualized alone, draped onhorizons or visualized as a property grid. Thecontacts can also be shown on modeled horizons ascontour lines.

Visualizing the contacts on surfaces in both 2D and3D is illustrative for showing the extent of the oil/gaszones. Nice maps can be made in the Map Windowand sent to the plotter.

Exercise Steps

1. Expand the Fluid Contacts and the Contact Setfolders under the Models tab.

2. Open the Horizons folder under the active 3Dgrid and display the Top Tarbert horizon in a 3D display window.

3. Display the oil/water and gas/oil contacts.

4. Open Settings > Style tab for the Fluid Contacts folder. Toggle on Show fill on horizons todrape the contacts over the horizon.

5. Select the Show contact surfaces to also see the contacts as surfaces.

Comments

For each contact there is an option Show fill on horizon. This must be

de-selected if you want to see the contact draped over your surface. The same option can befound under the Fluid Contacts settings regarding all the contacts. The Fluid Contact settingswill take over if they are different from the settings defined on a lower level.

If you want to display the contour line(s) then deselect the Show fill on

horizon under the Settings for all fluid contacts or for each individual contact.



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C) Visualizing the contacts in Map view

Map view is a window especially designed for creating scaled plots. The contacts can be visualizedin this window (and printed from this window as well, if desired). The Map window will be describedin more detail in the Plotting section.

Exercise Steps

1. Open a map window from the Window menu.

2. Display one horizon from the 3D grid.

3. Display the set of contacts to be visualized on top of this horizon.

D) Visualize contacts as properties in 3D

This operation allows the user to create a property where the cells are given a facies code

according to their position related to the hydrocarbon contacts. This may be a useful way ofdisplaying the contacts. The generated contact property can also be used as input for otherproperty calculations, for instance in the Property Calculator, or for filtering.

Exercise Steps

1. Right click on one Contact Set.

2. Select Settings.

3. In the settings window, select the Operationtab.

4. Select Gas Zone as the Code above thehighest contact.

5. Specify Facies Value Oil Zone below the GasOil Contact, and Water Zone below the OilWater Contact

6. Click Make Propertyand a new propertymodel called Contacts will be added insidethe Properties folder. Then click ok.

7. Display the Contacts property in the displaywindow. Visualise the property on a GeneralIntersection Plane and clip the plane in front or behind to get a cross-sectional view of the

mode.


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Ex15_MakeContact