Seismic Studio Tutorial Part 1 Project Construction from SEGY Data

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Seismic Studio Tutorial - Part 1Project
Construction from SEG-Y Data

• Boulder, Colorado USA
• May, 2004

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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

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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.

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Creating a new project
First, click on File, then on New Project in the
drop down menu.
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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.

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New Project Wizard
You give the project a name here and optional
description
Push Next
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New Project Wizard Page 2
Where will the geometry information come from?
For the tutorial, we will use Pre-stack SEG-Y
files.
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New Project Wizard Page 3
If you are combining 2D lines into a pseudo-3D,
then click 3D.
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New Project Wizard Page 4
Some pages are easier than others.
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New Project Wizard Page 5
Recommend that you click Yes for this tutorial.
Saves you the trouble of importing SEG-Y later.
Click Finish
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Just click OK here. You will get a chance to
define a grid later at a better time.
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The SEG-Y Import Wizard

• The general sequence is as follows
• Select SEG-Y file or files to import
• Define header locations
• Preview the geometry
• Let Seismic Studio build a database

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SEG-Y Import Wizard Page 1
Click here to add one or more SEG-Y files
You now have one SEG-Y file to import into the
project
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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.
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SEG-Y Import Wizard Page 3
We recommend you read this page your first time
through this wizard.
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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.
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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 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.
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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.
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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.
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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.
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SEG-Y Import Wizard Page 9
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.
Page 9 shows you how the trace 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.
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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.
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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.
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SEG-Y Import Wizard Page 12
Heres 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.
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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.
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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 Studios 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.
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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.
Lets look at the database.
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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.
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Source table window
When you have Easting (X-axis) and Northing
(y-axis), you get a map view .
Elevations
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Source table window
FFID numbers
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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
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Click Project, then click Detector table window
from the drop-down.
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Detector table window
As you create more windows, window icons will
show up here so you can navigate among them
easily.
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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.
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Map View
Another useful window is the Project/Map View
Click on any source location to see its receiver
pattern.
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Map View
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Map View
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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

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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