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

Map comparison: subtract one map from another

Contours > Isomap Grid Operations

Uses grid parameters derived from the key grid

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

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.

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

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

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

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

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

Remember that our Stratton data set also came with pre-picked formation tops. Those can also be imported.

RC>

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

RC>

RC > Settings > Color as Horizon and change fonts

Plain vanilla to color highlights

Processes > Utilities > Make Edit Surface

& more

Utilities > Make/Edit Surface > structure contour map

Not yet?

Make/edit surface selections & activate the map in your input tree

Fine tune the color mapping

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

• Before leaving today do the short Petrel exercise