m3 stratigraphic modeling

Module 3

Stratigraphic Modeling

Petrel Workflow Tools

3D Grid

Construction

Structural Gridding

Stratigraphic

Modeling

Pillar Gridding

Well Log

Upscale

Facies &

Petrophysical

Modeling

Make contacts &

Volume Calculation

Intr

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Pet

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Inte

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Wor

kflo

w E

dito

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Property Modeling

Make Horizons

Zones & Layering

3D Grid Construction: Structural Modeling S

tudi

o

3D Grid

Construction

Structural

Framework

Fault Modeling

Introduction Surfaces and

Data edit

Stratigraphic Modeling:

Objectives

Create and display data in a Well section window.

Working with well templates.

Well section settings

Track and log settings

Use the Log Calculator.

Interactive Facies Interpretation

Make/edit Well tops.

Well top spreadsheet

Stratigraphic Modeling

Stratigraphic modeling allows you to determine the similarity of

rock bodies at different locations where well data is available in a

Well section window.

Well Section Window

Offers the possibility to view multiple wells in

a well section, create marker picks (well tops),

and correlate between wells.

It uses a template-centric system.

Define your own log curve preference

system.

Choose from a default well section

templates.

Share well section templates between

projects.

Create your own default well sections

templates.

Well Section Window: Well SectionTemplate

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1. Create a new Well section template. It will be added to the

Templates pane. The new template will contain a depth track by

default. Next, you will build the template.

Go to the Window drop-down menu and select New well section

window. You have two options.:

2. Use an existing template. Any of the

previously created, imported, project

converted, or predefined Petrel

system templates can be used.

Add a Well to a Well Section Window (1)

Activate the Well correlation process and open the Settings for the well section

window. There are several ways to add wells.

1. Select the checkbox in front of the desired

wells from the main Wells folder in the

Input pane.

2. Open the settings for the Well section

window, on the Definition tab, add multiple

wells from the Input pane by clicking the

Blue arrow.

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Add a Well to a Well Section Window (2)

Well Section Fence

3. Display your wells in a 3D or 2D window. Click Add well to well section in the

function bar.

4. Click on the well paths to add them.

After the fence is created in the 3D/2D window, Petrel automatically creates the fence

in a Well section window in the Windows pane.

Position the cursor on the white depth

panel. Move the end icon while using the

left mouse button to scroll the display up

or down the well.

Position the cursor on the line

between the gray and white areas.

Move the arrow icon to stretch or

squeeze the well.

Zooming and Scrolling in Well Section

Settings for a Well Section Window

1. Define the well position synchronization:

• No synchronization

• Scroll relative- synchronizing all wells

• Flatten on different reference points.

2. Define the scale settings:

• Lock: Will lock the present scale across the

correlation window

• Absolute value.

3. Define the depth measurement type. This describes

the vertical scale in which the logs are plotted.

4. Add wells to the Well section window from the Input

pane by clicking the Blue arrow.

5. Choose a predefined template or one of your own.

Note: To synchronize the scrolling and the

scaling across the correlation panel, click icons

from the function bar.

Settings for the Well Section Template

There are three ways to access Settings for the Well section display template.

1. Double-click on the template name in the

Templates pane.

2. Click the display template Settings shortcut

icon on the Well Section toolbar to the right

of the template name pull-down menu.

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3. Click the display template Settings

shortcut from the Settings window.

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Settings for the Well Section Template:

Depth Track

Insert a new depth panel into the well section and change the depth type.

1. Open the well section template

settings.

2. Select Add new object and select

Index track.

3. Specify the depth scale measurement.

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Note: To edit the current Depth scale panel, click the Style

tab of the Well section template settings and specify here.


General Track Settings: Style Tab

Add a log curve to a new or existing track folder as a log panel icon. The style of

the track panel is controlled from the Well section template settings.

1. Change the width of the panels. You

also can change the size of the log

panels with the Pick mode by dragging

the edge of the panel header.

4. Background color and transparency.

3. Decide on the display of the track grid

lines: either horizontal vertical lines.

2. Define Log scaling: Linear or

Logarithmic.


General Track Settings: Curve Filling

1. Click Create/edit curve fill on the function

bar. Left-click in the area between the log curve

and the panel edge.

The color fill is controlled by the template associated to each log.

2. More complex curve fills can be designed on

the Curve filling tab using the Well section

template settings. To add a new curve fill:

a. Click the Append row button.

b. Specify the Depth interval.

c. Set the Fill edge.

d. Fill style with pattern and colors.

a

b

c

d Note: To adjust the color range, open the settings for

the log from Global Well Logs, go to the Colors tab.

Create or Edit Log Templates

Standard Petrel templates may not always fit your needs. They can be changed or

you can make new ones. Go to the Templates pane and take one of these actions.

1. Copy/paste an existing template using Ctrl+C/Ctrl+V

and edit it in the Colors tab.

2. Create a new template:

3. Right-click on the folder where it should reside and

select New template.

4. Double-click and open the settings.

a. Give it a name and click an icon in the Info tab.

b. Define the color codes or scale in the Colors

tab.

Note: These are global templates; any change

will affect all objects using the same template.


General Log Settings

On the Well section template settings tab, choose any log panel stored under

a track folder and click the Limits tab.

1. On the Limits tab, you can set the curve scales

appropriately.

2. On the Style tab, specify options on the log

curves and log points.


Grouping Logs in a Single Track Panel

2. Open the settings of a Well section template.

1. Expand the Global well logs folder and toggle

ON any log you wish to display with your wells.

3. Review the tree structure of your logs stored on

the Well section template settings tab.

Highlight the log you wish to move.

4. Move it to a new position using the blue arrows.

5. Highlight the track and in the Objects settings

Info tab, enter a name, and click Apply.

6. Highlight empty tracks and click the Delete

selected object icon.

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Coloring Two Logs in a Single Track Panel

1. Insert a new well section window and choose the wells

you wish to visualize from the Input pane.

2. Expand the Global well logs folder and right-click on

any log. Select Add to template > In new Track.

3. Right-click on another log and add it to the template in

the same track as the previous one.

4. Show the Well section template settings.

5. Highlight the track and in the Objects settings, Info tab,

and enter a name.

6. Click the Curve filling tab and add two color fills.

7. Highlight the Color fill and define the Fill edge and Fill

style for each of the curve fillings. Click Apply.

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Log Calculator

Use the Log calculator to create/edit and perform operations on logs.

3. List of available logs.

1. Input equation...

4. Select template for new log.

5. Click the ENTER button to run

the equation.

6. List of previously run equations.

2. ...or browse for a file to be used

History archive

Formula bar

Data list

Note: The calculator can be run

on:

• Individual wells

• Subset of Wells (folder)

• Subset of Wells (Saved search)

• All Wells.

Do this by opening the calculator

with a right-click on the

respective folder levels.

Apply a Facies Cut-Off

Create a new discrete log that is defined by

cut-off values from a continous log using the

log Calculator.

2. Enter the statement: If porosity log is less than 13% then Facies code 0 else if it

is higher, then Facies code 1.

4. Click Apply. The new log is stored in the Global well

logs folder. Visualize it in Well Section window.

1. Right-click in the Wells folder in the Input pane and

select Calculator.

3. Set the appropiate template (code 0 Clay and 1 Sand).

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Interactively Interpret Facies

Interpret Facies Logs in a New Track

1. Click Paint discrete log class together with

Create new discrete log .

2. Choose the discrete template for the new log

and click OK. The new log is stored in the

Global well logs folder in the Input pane.

3. Right-click in the panel and choose the facies

you wish to paint.

4. Interpret and edit the classes already

interpreted by placing the cursor in the line

between two discrete classes.

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Flatten on Well Tops

Flattening on well tops is used to correlate

intervals. It can be done in two ways.

1. b) Right-click on a well top in the Well Tops folder and

select Flatten well section on horizon.

2. Click the Definition tab in the settings for the Well

Section window. Choose Flatten on well top, highlight a

well top in the Input pane, and drop it into the field by

clicking the Blue arrow. Click Apply.

1. a) Select the Well Tops folder in the Input pane.

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Note: To unflatten well tops, either choose the

option No synchronization on the Definition tab

or ensure the synchronization icons ( )

are toggled off and scroll.

Edit Well Tops in a Well Section Window

1. Select the Create/edit well tops tool .

2. Move existing well tops by clicking on the well top and dragging

it to a new position.

3. Insert a well top for an existing horizon:|

Activate the Stratigraphic Well top from the Input pane, making

sure is active and click in the well panel.

4. Insert a well top for a new horizon:

Select Add new well top surface . Click in a well panel. A

new horizon will be added to the active subfolder of the active

well tops.

Note: Undo and redo options are limited to 5 steps.

Beware of the highlighted

items in the Input pane.

5. To prevent edits in existing well tops, right-click on the well top in

the Input pane and select Lock well top.

Change the horizon type on the Settings tab in the settings dialog.

Selecting

Erosional will

truncate horizon

lines of the same

depth beneath.

Well Tops Spreadsheet

Right-click on the Well Tops folder and select Spreadsheet. All changes

are reflected in the Well top spreadsheet. Filter by well and edit/create

new well tops.

Extra: Well Projection on Intersections

This functionality allows you to project wells on the fence

depending on the set distance. Petrel well projection

procides full control of how wells are projected. You can

assign projection direction for each well independently.

Note: Changes made on the 3D window will

automatically be updated in the intersection window.

EXERCISE

m3 stratigraphic modeling

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