Presentation on theme: "Boulder, Colorado USA May, 2004"— Presentation transcript:
1Boulder, Colorado USA May, 2004 Seismic Studio Tutorial - Part 1 “Project Construction from SEG-Y Data”Boulder, Colorado USAMay, 2004
2Welcome to Renegade Geophysics’ Tutorial for Seismic Studio Part 1 Tutorial Part 1 will teach you how to:Bring SEG-Y data into Seismic StudioView your geometry from the source, detector, trace and bin perspectives
3Creating a new projectEverything 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.
4First, click on File, then on New Project in the drop down menu. Creating a new projectFirst, click on File, then on New Project in the drop down menu.
5Creating 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 databaseThe New Project Wizard is very short and it really only wants to get some idea of what your new project will be like.
6You give the project a name here and optional description New Project WizardYou give the project a name here and optional descriptionPush “Next”
7New Project Wizard – Page 2 Where will the geometry information come from? For the tutorial, we will use “Pre-stack SEG-Y files.”
8If you are combining 2D lines into a “pseudo-3D,” then click “3D.” New Project Wizard – Page 3If you are combining 2D lines into a “pseudo-3D,” then click “3D.”
9Some pages are easier than others. New Project Wizard – Page 4Some pages are easier than others.
10New Project Wizard – Page 5 Recommend that you click “Yes” for this tutorial. Saves you the trouble of importing SEG-Y later.Click “Finish”
11You will get a chance to define a grid later at a better time. Just click OK here.You will get a chance to define a grid later at a better time.
12The SEG-Y Import Wizard The general sequence is as follows:Select SEG-Y file or files to importDefine header locationsPreview the geometryLet Seismic Studio build a database
13SEG-Y Import Wizard – Page 1 Click here to add one or more SEG-Y filesYou now have one SEG-Y file to import into the project
14SEG-Y Import Wizard – Page 2 Click here to name a new header mapYou now have specified a header map.Starting on the next page you will define the mapping.
15SEG-Y Import Wizard – Page 3 We recommend you read this page your first time through this wizard.
16SEG-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.
17SEG-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.
18SEG-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.
19SEG-Y Import Wizard – Page 7 Page 7 shows you how the source geometry values map on the first 3 traces of your SEG-Y fileIf you want to change a mapping, click on the map entry and then click the “Edit selected” button that will be activated.
20SEG-Y Import Wizard – Page 8 Page 8 shows you how the detector geometry values map on the first 3 traces of your SEG-Y fileIf you want to change a mapping, click on the map entry and then click the “Edit selected” button that will be activated.
21SEG-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.
22SEG-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.
23SEG-Y Import Wizard – Page 11 This page performed a quick scan of the first traces and displayed the geometry-derived results here. If the range values look correct, push Next. If you want to change something, push Prev.
24SEG-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.
25The SEG-Y Import Wizard is Finished 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.
26Seismic 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.
27Let’s look at the 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.
28Source table windowThis 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.
29Source table windowWhen you have Easting (X-axis) and Northing (y-axis), you get a map view .Elevations
31Source table windowHere we are plotting elevation vs total fold and coloring by FFID.(This plot is only to illustrate the flexibility of this display.)FFID numbers
32Click Project, then click “Detector table window” from the drop-down.
33Detector table windowAs you create more windows, window icons will show up here so you can navigate among them easily.
34Of course, you can also crossplot anything in the detector table. 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.
35Map View Another useful window is the Project/Map View Click on any source location to see its receiver pattern.
38Conclusions 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
39Some 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 databaseYou can always add more SEG-Y data to an existing projectSee “Import/Import SEG-Y data.”