M3 Stratigraphic Modeling

Module 3 Stratigraphic Modeling

Petrel Workflow Tools Surfaces and Data edit

Stratigraphic Modeling

3D Grid Construction: Structural Modeling

Interface Studio

Pillar Gridding

Fault Modeling 3D Grid Construction Structural Framework

3D Grid Construction Structural Gridding

Property Modeling

Well Log Upscale

Facies & Petrophysical Modeling

Make Horizons Zones & Layering Make contacts & Volume Calculation Workflow Editor

Intro to Petrel

Introduction

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 Go to the Window drop-down menu and select New well section window. You have two options.: 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. 2. Use an existing template. Any of the previously created, imported, project converted, or predefined Petrel system templates can be used.

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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 function bar.

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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.

Zooming and Scrolling in Well Section 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.

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. 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.

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3. Specify the depth scale measurement.

Note: To edit the current Depth scale panel, click the Style tab of the Well section template settings and specify here.

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Settings for the Well Section Template 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. 2. Define Log scaling: Linear or Logarithmic. 3. Decide on the display of the track grid lines: either horizontal vertical lines. 4. Background color and transparency.

Settings for the Well Section Template General Track Settings: Curve Filling The color fill is controlled by the template associated to each log. 1. Click Create/edit curve fill on the function bar. Left-click in the area between the log curve and the panel edge. 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. Note: To adjust the color range, open the settings for the log from Global Well Logs, go to the Colors tab.

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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.

Settings for the Well Section 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.

Settings for the Well Section Template Grouping Logs in a Single Track Panel 2

1. Expand the Global well logs folder and toggle ON any log you wish to display with your wells. 2. Open the settings of a Well section template.

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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

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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Settings for the Well Section Template 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.

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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.

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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. 1. Input equation... 2. ...or browse for a file to be used

History archive Formula bar

3. List of available logs. 4. Select template for new log. 5. Click the ENTER button to run the equation. 6. List of previously run equations.

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.

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

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2. Enter the statement: If porosity log is less than 13% then Facies code 0 else if it is higher, then Facies code 1.

3. Set the appropiate template (code 0 Clay and 1 Sand). 4. Click Apply. The new log is stored in the Global well logs folder. Visualize it in Well Section window.

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Interactively Interpret Facies Interpret Facies Logs in a New Track 1. Click Paint discrete log class Create new discrete log .

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

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Edit Well Tops in a Well Section Window 1. Select the Create/edit well tops tool

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Beware of the highlighted items in the Input pane.

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

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