Session Two

Working with data

In this Session

• Opening new or existing Project

• Importing data into Oasis Montaj

• Basic operations on database channels

• Gridding of simple data.

• Basic operations on grids.

Opening new or existing Project

Def.Project file include links to all databases, grids and maps. Oasis Montaj adopt this kind files so that all previous analysis are recorded for further analysis or interpretation. Remember, at the end of session you need to make sure that you saved all your work to the project file opened.

We have two options under project menu item, New and Open. If you are starting from scratch you choose “New” otherwise, choose “open”. Clicking any of the two will result in opening a file manager window (next slide).

File manager window to create or open project

Demonstrating this step on real OM session

It is recommended to open new directory of your new project. Transfer your data files to that directory save your work (e.g. database, grids, maps …etc.) their. It is also recommended to make backup for that directory each time you carry out analysis and modeling within your project to avoid loss of your work.

Importing Data

Your data Import

OM database

Q. What does “database” mean?

a usually large collection of data organized especially for rapid search and retrieval (as by a computer)

Q. What are the kinds of data I can import into Oasis Montaj?

Any data that can be tabulated in the form of columns can be imported to OM. The file format can be ascii, Spreadsheet (excel), databases …etc. In addition some industry standard formats like AMIRA and SEGY can also be imported.

Import data from this menu item

Data formats that can be imported

ASCII

EXCEL SPREADSHEET

We will concentrate on

Importing ASCII files

ASCII files is a plain text file that can be generated, edited using any text editor such as notepad.

Data should be tabulated into columns with separation like space, tab or comma.

Importing ASCII file

Browse for the ASCII file you want to import.

Wizard optionThis option defines how the data in the ascii files are arranged. For example, the headers, the text separation and the data type (e.g. numbers, date …etc)

After defining the data in the file you may save this definitions into template files, if you have other files with similar formats. For subsequent file readings you use the template option instead of wizard.

Put database name here.

Database window

Demonstrating this step on real OM session

Operations in databasewindow

Two typesof operations Channel def. and

view options

Operations on the data

Inside the channel

Operations on the data

statistics

Show profile

Shoesymbols

Gridding

Coord. definition

Choose channel data and gridding scheme

Demonstrating this step on real OM session

Working with Array channels

Array channel are usually used when importing Resistivity, Seismic, GPR …etc.

X and Y here represent the location of observationOr modeling points at the earth’s surface. The Z channel

Cannot be a single value. That’s why we adopt array channelsIn place of ordinary single values ones.

Sample database with array channel

Array channel

How to import array channel using ASCII import option?

Well, this can be done in the definition of data format using the wizard as in the following example.

Original Data

x yResistivity

Starting from this column

choose

Then enter the number of columns of your array channel here

Demonstrating this step on real OM session

Importing data from xls files

Choose whether your dataAre represented in

Single or multi-sheets

Create new database

Browse for xls file to import

Choose this then press OK

Demonstrating this step on real OM session

End of data Import Session