lec13-14
TRANSCRIPT
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Tom Wilson, Department of Geology and Geography
Objectives for the Day
• Some more on grid operations• Intro to Petrel• Setting up a project
• Importing well data• Basic view manipultation• Importing formation tops• Make-edit surface• Edit map display color
F39 Well Log Derived Depth
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Map comparison: subtract one map from another
Contours > Isomap Grid Operations
Uses grid parameters derived from the key grid
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Examine the difference between well log derived depths and those derived from seismic using stratigraphic and well log picks for depth conversion
Negative – a negative is positive if absolute value of 2nd term is greater.
Deeper well log depth subsea
Deeper seismic depth subsea
Computing gradient or derivative maps
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1st derivative of the F39 surface in the dip direction: highest positives and lowest negatives mark curve inflection points
Bring up Petrel
Select License Package
Kudos to Valerie Smith for for preparing the data set
and the handout.
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Basic Petrel project window layout
Inputs Models Results Templates
Processes Cases Workflows Windows
Basic
project
tree
Starting a new projectProject > Project Settings
Under Units and Coordinates > Select Field for your units system
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And you thought you were through with the Stratton dataset
We’re back to square 1. We have to import data and build a database.
Go to Insert > New Well Folder
Your input tree should now include a wells drop down list.
RC > Import on Selection
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The ascii import file has a simple structure. Note that the column titles are listed following the BEGIN HEADER line
Familiar well numbers from
StrattonUndefined value
KB & TD
View Petrel Import File Structure
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Petrel reads the header list and should follow the format of your input ascii file
Display window manipulation basics
Ctrl + shift > mouse up-down, left right to zoom in and out
Ctrl or shift > mouse up-down, left right to move the entire view up or down
Change vertical scale
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Drop down the wells in the list and RC > Well Manager to see Petrel’s version of the well input file
You can QC to cross check posted values with your import data set
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Remember that our Stratton data set also came with pre-picked formation tops. Those can also be imported.
RC>
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MD Type Surface
Check the well tops drop-down check box.
Ctrl +shift > then move mouse to zoom in
Ctrl (or shift) + mouse movement up and down to position the window vertically
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RC>
RC > Settings > Color as Horizon and change fonts
Plain vanilla to color highlights
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Processes > Utilities > Make Edit Surface
& more
Utilities > Make/Edit Surface > structure contour map
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Not yet?
Make/edit surface selections & activate the map in your input tree
Fine tune the color mapping
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You should have map similar to the one below. Adjust the vertical exaggeration to see structural features in 3D relief.
Under the style tab > Adjust contour labels & explore other function tabs
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• Before leaving today do the short Petrel exercise