Transcript Seismic Studio Tutorial

Seismic Studio
Tutorial - Part 1
“Project Construction
from SEG-Y Data”
Boulder, Colorado USA
May, 2004
Welcome to Renegade Geophysics’
Tutorial for Seismic Studio
Part 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.
Creating a new project
First, click on File, then on
New Project in the drop
down menu.
Creating a new project
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.
New Project Wizard
You give the project a name
here and optional description
Push “Next”
New Project Wizard – Page 2
Where will the geometry information come from?
For the tutorial, we will use “Pre-stack SEG-Y files.”
New Project Wizard – Page 3
If you are combining 2D lines into
a “pseudo-3D,” then click “3D.”
New Project Wizard – Page 4
Some pages are easier than
others.
New Project Wizard – Page 5
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
SEG-Y Import Wizard – Page 1
Click here to add one
or more
SEG-Y
You now
havefiles
one SEG-Y file to import into the project
SEG-Y Import Wizard – Page 2
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.
SEG-Y Import Wizard – Page 3
We recommend you read
this page your first time
through this wizard.
SEG-Y Import Wizard – Page 4
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.
SEG-Y Import Wizard – Page 5
This page is relevant if you are importing 3D data
and the line numbers are combined with the source
Onceand
you detector
click on your
enter the scalar
point file,
numbers.
values
here,forclick
the check
andon
If this is
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youronSEG-Y
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left click
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in Apply
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SEG-Y Import Wizard – Page 6
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.
SEG-Y Import Wizard – Page 7
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.
SEG-Y Import Wizard – Page 8
Page 8 shows you how the
detector 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.
SEG-Y Import Wizard – Page 9
This is where youPage
can9 import
pick
shows you
how the trace
geometry
values
map on the first
times that you might
have
in your
3 traces of your SEG-Y file.
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.
If you want to change a mapping,
click on the map entry and then
click the “Edit selected” button
that will be activated.
SEG-Y Import Wizard – Page 10
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.
SEG-Y Import Wizard – Page 11
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.
SEG-Y Import Wizard – Page 12
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.
The SEG-Y Import Wizard is Finished. Now
your data will be loaded and a database will be
constructed.
As Seismic Studio loads your data, you can see
how the sources and detectors are mapped.
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.
Click Project, then click “Source table window” from the drop-down.
When your data have finished loading, Seismic
Studio has created a geometry database for
you.
Let’s look at the database.
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 window
When you have Easting (Xaxis) and Northing (y-axis),
you get a map view .
Elevations
Source table window
FFID
numbers
Source table window
Here we are plotting elevation vs
total fold and coloring by FFID.
(This plot is only to illustrate the
flexibility of this display.)
FFID
numbers
Click Project, then click “Detector table window” from the drop-down.
Detector table window
As you create more
windows, window icons
will show up here so you
can navigate among
them easily.
Detector table window
As 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
Another useful window
is the Project/Map View
Click on any source
location to see its
receiver pattern.
Map View
Map View
Conclusions for Tutorial Part 1
You have created a file and loaded a
SEG-Y file into it
You have extracted a geometry
database from the SEG-Y headers
You have looked at source and
detector attributes for you extracted
project database
Part 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