Seismic Studio Tutorial - Part 1 Project Construction from SEG-Y Data Boulder, Colorado USA May,...

Seismic Studio Tutorial - Part 1

“Project Construction from SEG-Y Data”

Boulder, Colorado USA

May, 2004

Welcome to Renegade Geophysics’ Tutorial for Seismic StudioPart 1

Tutorial Part 1 will teach you how to:

Bring SEG-Y data into Seismic Studio

View your geometry from the source, detector, trace and bin perspectives

Creating a new project

Everything Seismic Studio does, it does within a project.

By default, all Seismic Studio projects will reside under the C:\SeismicStudioProjects directory.

To start this Tutorial, you must create a new project.


First, click on File, then on New Project in the drop

down menu.


This brings up the New Project Wizard

This wizard will create a project directory with your project name and will create some files that will be used to store the database

The New Project Wizard is very short and it really only wants to get some idea of what your new project will be like.

You give the project a name here and optional description

New Project Wizard

Push “Next”

Where will the geometry information come from? For the tutorial, we will use “Pre-stack SEG-Y files.”

New Project Wizard – Page 2


If you are combining 2D lines into a “pseudo-3D,” then click “3D.”


Some pages are easier than others.


Recommend that you click “Yes” for this tutorial. Saves you the

trouble of importing SEG-Y later.Click “Finish”

Just click OK here. You will get a chance to define a grid

later at a better time.

The SEG-Y Import Wizard

The general sequence is as follows:

1. Select SEG-Y file or files to import

2. Define header locations

3. Preview the geometry

4. Let Seismic Studio build a database

Click here to add one or more SEG-Y filesYou now have one SEG-Y file to import into the project

SEG-Y Import Wizard – Page 1

Click here to name a new header map


You now have specified a header map.Starting on the next page you will define

the mapping.


We recommend you read this page your first time

through this wizard.


This page is relevant if you are importing a series of 2D lines into a pseudo-3D project. You should assign each 2D line a different

line number to avoid confusion.


This page is relevant if you are importing 3D data and the line numbers are combined with the source

and detector point numbers. If this is the case for your SEG-Y data, left click on the file and enter the scalars in the activated fields.

Once you click on your file, enter the scalar values here, click on the check boxes, and

then click the green Apply button.


These values are for entering scale factors. If you want to change anything, click on the entry, then click the “Edit Selected” button

that will activate.


Page 7 shows you how the source geometry values map on the first

3 traces of your SEG-Y file

If you want to change a mapping, click on the map entry and then

click the “Edit selected” button that will be activated.


Page 8 shows you how the detector geometry values map on the first 3 traces of your SEG-Y

file




Page 9 shows you how the trace geometry values map on the first

3 traces of your SEG-Y file.



This is where you can import pick times that you might have in your

trace headers. You can import them as either user picks or predicted

picks.

You can always change your mind at any time when you are running the

program.


Sometimes when you are creating a big 3D project with lots of SEG-Y files, there will be some conflicts. For example, two shots with the same numbering, will have different x,y coordinates. This window tells Seismic Studio how you want to handle the situation.


This page performed a quick scan of the first 10000 traces and displayed the geometry-derived results here. If the range values look correct, push Next. If you want to change something, push Prev.

Here’s a map of the scanned geometry from the first 10,000 traces. Summary values on the left. If the values and map look correct, push Finish. If you want to change something, push Prev.


As Seismic Studio loads your data, you can see how the sources and detectors are mapped.

The SEG-Y Import Wizard is Finished. Now your data will be loaded and a database will be

constructed.

Seismic Studio uses a grid for branch assignment and some trace displays. This grid

is not the same as your reflection data processing grid.

Typically, Seismic Studio’s grid should have bin sizes that are 4 to 8 times bigger than your

reflection bin size.

If you want to re-orient the grid, click on the map and drag the mouse in the new direction.

When you are happy with the grid, click Close and Seismic Studio will complete construction

of your geometry database.

When your data have finished loading, Seismic Studio has created a geometry database for

you.

Let’s look at the database.

Click Project, then click “Source table window” from the drop-down.

Source table window

This spreadsheet shows you everything Seismic Studio knows

about your source geometry.

Everything Seismic Studio computes will also get appended

to this table, such as source delay times, statics, model

thicknesses, velocities, etc.

Source table windowWhen you have Easting (X-axis) and Northing (y-axis), you get a map view .

Elevations

Source table window

FFID numbers

Source table window

FFID numbers

Here we are plotting elevation vs total fold and coloring by FFID.

(This plot is only to illustrate the flexibility of this display.)

Click Project, then click “Detector table window” from the drop-down.

Detector table windowAs you create more

windows, window icons will show up here so you

can navigate among them easily.

Detector table windowAs you create more

windows, window icons will show up here so you

can navigate among them easily.

Of course, you can also crossplot anything in the

detector table.

Map View

Click on any source location to see its receiver pattern.

Another useful window is the Project/Map View

Map View

Conclusions for Tutorial Part 1

You have created a file and loaded a SEG-Y file into itYou have extracted a geometry database from the SEG-Y headersYou have looked at source and detector attributes for you extracted project databasePart 2 will discuss trace display and refraction picking

Some more information about Projects

You can always add one project to another project.

See “Import/Import another project.”Any new sources and detectors will be added to the project database

You can always add more SEG-Y data to an existing project

See “Import/Import SEG-Y data.”Any new sources and detectors will be added to the project database

Seismic Studio Tutorial - Part 1 Project Construction from SEG-Y Data Boulder, Colorado USA May,...

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