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Tsunami Development
Jaclyn Cribley July 18, 2011 • Announcements
Release Notes
Overview
I am pleased to announce our new release of Tsunami software, the Tsunami B2011 suite. This suite contains new versions of PSTM, PSDM, and Tomography. Details on the changes are contained herein.
I have been asked a few times now, what Tsunami is planning for upcoming releases. For our INTViewer customers, you will be pleased to know that we are planning our next release to contain new plug in tools developed for versions 4.0 and greater of the INTViewer. Our new Autopicker tool that has been under beta testing for some time and a semblance builder will be presented in the C2011 release. Additionally, we are planning the release of a new Rays and Smoother tool, though the date is not yet set. If you are not a current user of the INTViewer or you are just interested in what other tools are under development, please let your account representative know. They will be happy to show you more. sales@tsunamidevelopment.com
We are continuing to expand our support content for our customers. In May we added a support button to our homepage. Users can now submit a support request from any page on our website. This also means that our old support ticketing system is now defunct and has been removed from the site altogether.
New support content is being added to our support portal every month at support.tsunamidevelopment.com. Some information is only available to customers, and those users will need to log in to see all the features it offers. If you forgot your password, no worries. You can request a reset link quickly and easily from the log in screen.
I want to take a moment to highlight two of the great benefits of the support portal for our customers. We are taking the more commonly asked questions and converting them into forum topics with detailed explanations and pictures, where possible, to make finding solutions fast and efficient. Users can interact with these support documents and let us know when more information is needed. It’s a great way to make support more powerful. Also, customer’s support request history is maintained and easily reviewed by the user or our support geophysicist. If a customer has an issue similar to something in the past the support representative can review this information to provide a timely solution. As we are supporting more companies around the globe, using the support portal or support@tsunamidevelopment.com means that we can deliver the excellent customer support you expect.
Before I sign off on this update, I also have to pass on news of our newsletter, lunch & learns, and the new support phone number. Starting in May Tsunami began sending out a monthly newsletter with information on new features, tools, and upcoming events. Speaking of events, we have begun hosting periodic Lunch N Learns in our Houston, Tx office. Look for these to start showing up in Europe late this year. If you are not getting the newsletter or you want to know about upcoming events before they happen, email Melanie Blind melanie.blind@tsunamidevelopment.com. Finally, Tsunami Support has a new direct number! +1 713-900-2099 will call our support staff directly, no fancy queues or numbers to press. If we are there, we will answer the phone, but if we are not please leave us a voicemail. It will be emailed to entire group, and someone can get back to you quickly.
Happy migrating,
Jaclyn Cribley
Operations Director
Tsunami Development
General
In the latest release users will see a change to the structure of the INTViewer installers. Inside the release will be a directory named INTViewer and under that a directory called releases which will contain multiple version of the latest INTViewer as well as supporting files. Users may install which ever version of the viewer they wish. Newer versions will support more plug ins as they are released. The viewer will only work for Tsunami customers with a current license. Please contact your sales representative if you have questions.
PSTM new features
The newest release of Pre-Stack Migration software is PSTM 5.9.
Data Preparation
In the previous release of the Tsunami Suite, A2011, we released the data preparation features in our depth migration software. This release of Tsunami B2011 brings these same features to our Pre-Stack Time Migration. These processes are applied before the migration.
•Amplitude Scaling computes and applies a time variant scaling function defined by a 1/t scaling power. For example, enter a parameter value of 2 to scale the input trace by 1/t2.
•Filters applies a Bandpass frequency filter defined by low cut/high cut frequency pairs. Enter values for zero pass frequency and full pass frequency to define the high cut and low cut ramps.
•AGC automatically applies an AGC operator length defined by the Window Length parameter.
Converted Wave algorithm changes
Many changes were made to our algorithm for converted wave applications to improve the image quality. Most of these changes involve improvements to the underlying algorithms and will be transparent to the user. New variable velocity options allow variation of gamma and of both P-wave and S-wave velocities together. Previous versions used a single gamma function. The new release allows use of a spatially varying gamma field. We feel that the updates give an image of superior quality to the results produced by other tools on the same data.
Input data in PP and PS time is now supported and can be selected on the user interface.
A new utility has been added in the INTViewer to generate an S-wave model from a P-wave model and a gamma file. SEGY models can be generated from ASCII input files. This utility will work with gamma, velocity and eta data and is implemented in the INTViewer. plug in names
For information on installing INTViewer plug-ins refer to the support article built into the INTViewer help.
PSTM Enhancements
1/t **n changes
In previous versions the user could only supply positive integers for this variable. The program will now accept negative and positive integers.
PSDM Enhancements
The latest release of PSDM is 5.8.sp1.
Output at Floating Datum
This option, when selected was not properly outputting data as expected. This has been corrected.
TOMO Enhancements
The latest release of PSDM is 5.7.sp1.
Error: Negative Slowness
Users reported receiving the error “Negative Slowness” in the log file. This error was the result of a miscalculation which has been corrected.
GUI new features
Data Prep Tab
The data prep tab was added to support the new features of PSTM discussed earlier.
Geometry tab now has Check Coordinates
Traditionally PP data causes the data to fail the geometry check. There is an option on this tab to skip the geometry check, which will prove useful when you working with the converted wave application.
Converted Wave Tab
The Converted Wave Tab now has Domain of Input Seismic, choices are PP or PS, and the VP/VS (Gamma) Velocity Model user option.
Variable velocity tab
The Variable Velocity tab now has a new Function option of Gamma (VP/VS) and a Function option of P-Wave & S-Wave velocities.
Changes to GUI
Internationalization bug
When the OS has been set to a language that uses commas rather than periods in representing a floating point number, numerous problems occur in setting parameters, both in the user interface and the INTViewer. The Tsunami start up script has been modified to resolve this issue.
Geometry Map / trace.db
When the trace.db file is read, any shots or receivers falling outside the defined INLINE / XLINE boundary were assigned a shot number of zero. If a shot zero was detected, the geometry map failed with the error, “XXX.” This has been corrected.
Data Prep tab
1/t scaling has been moved from the Processing tab and is now a user supplied value as described above.
Known Issues
Updates for known issues are maintained on our support portal at support.tsunamidevelopment.com. This is a list of known at this time.
TOMO Travel Time Files
The GUI says it will take a single file for the travel time and seed horizon files. However, the user interface is only accepting a list of files. The work around is to supply a file list for the travel times.
Output at floating datum in PSTM
In the user interface on the Output tab, there is a parameter to output at the floating datum. At this time this feature works in PSDM but is not functional in PSTM. A solution is under development for the next release of PSTM, and if any user desires a beta version in advance, please contact Tsunami at support@tsunamidevelopment.com.
Jaclyn Cribley March 30, 2011 • Announcements
A2011 Release Notes
We thank you for your continued use of our software and support in making the Tsunami Suite better. Special thanks go out to our customers who have worked with us to add the most wanted features. Feedback and requests from our users are what drive our continued improvement.
This release contains enhancements to Pre-Stack Depth Migration and Ray Tracer. We have long supported VTI anisotropy; and now the Tsunami suite allows you to use TTI in ray calculation. The Pre-Stack Depth Migration application can directly prepare data for migration.
To get updates on planned changes and releases of our software, please visit our new support portal for the latest information ( http://support.tsunamidevelopment.com/ ). Do not hesitate to call us, or email our customer support team any time at support@tsunamidevelopment.com .
The Information contained in this document is subject to change without notice. Tsunami Development assumes no responsibility for any error that may appear in this manual. Tsunami Development does not warrant that this document is error free. Please report any errors in this document in writing to Tsunami Development. Some states or jurisdictions do not allow disclaimer of expressed or implied warranties in certain transactions; therefore this statement may not apply.
Overview
The A2011 Tsunami Suite releases an enhanced Pre-Stack Depth Migration 5.8. We now include a Data Prep tab which allows you to prepare your data for migration directly in PSDM. With this release you can now scale and filter trace data before running migration; this feature will also be added to Pre-Stack Time Migration in the next release. An enhanced Ray Tracer 5.8 is also included in this release which allows tilted transverse isotropy (TTI) to be incorporated in the calculation of the travel times.
We have made fixes to Ray Tracer, Smooth Velocity 5.7, and Pre-Stack Time Migration 5.8. Pre-Stack Depth Migration’s Geometry Map now allows for display of very large datasets.
We also updated how the GUI stores user profile information for recently viewed parameter files and the last opened directory.
New Features
Pre-Stack Depth Migration 5.8
Tsunami releases Data Prep in Pre-Stack Depth Migration 5.8 so our clients can prepare their data for migrations directly in PSDM. With this release you can now scale and filter trace data before migration.
Data prep
Select Pre-Stack Depth Migration > Data Prep to apply the following parameters:
•Amplitude Scaling computes and applies a time variant scaling function defined by a 1/t scaling power. For example, enter a parameter value of 2 to scale the input trace by 
•Filters applies a Bandpass frequency filter defined by low cut/high cut frequency pairs. Enter values for zero pass frequency and full pass frequency to define the high cut and low cut ramps.
•AGC automatically applies an AGC operator length defined by the Window Length parameter.
Ray Tracer 5.8
TTI anisotropy can now be incorporated in the calculation of the travel times in Ray Tracer by supplying azimuth and dip files to the input parameters.
Support for TTI
The observed phenomenon of waves traveling at different speeds through the earth, depending on their direction of propagation, is known as Seismic Anisotropy. This effect can be caused by geological factors such as layering, fracturing, tilting, etc. When layers are relatively flat and the principal cause of anisotropy is fine layering, such as that commonly found in shales, the medium is said to be Vertically Transversely Isotropic, or VTI. In this case, the wave travel times vary between the purely vertical and purely horizontal directions. The anisotropic parameters epsilon and delta describe this relationship between horizontal and vertical velocities, and are used as additional input to the imaging software. This assumption works well for imaging in many settings.
When structural deformation has occurred, and the anisotropic layers are no longer horizontal, other factors must be included in order to perform accurate imaging. These cases are known as Tilted Transverse Isotropy, or TTI. In addition to the anisotropic parameters epsilon and delta, dip and azimuth information must also be input to the imaging software in order to describe the structure. This can become particularly important in structurally complex areas such as overthrust zones. If TTI imaging is not performed in areas such as this, vertical and/or lateral mispositioning of events may occur.
The following files are all required for TTI:
Provide an epsilon SEG-Y file. The file must contain epsilon values at the same inline, xline and depth as the velocity samples in the velocity model.
Example: /projects/summit/epsilon.sgy
Provide a delta SEG-Y file. The file must contain delta values at the same inline, xline and depth as the velocity samples in the velocity model.
Example: /projects/summit /delta.sgy
Provide an azimuth SEG-Y file. The file must contain azimuth values at the same inline, xline and depth as the velocity samples in the velocity model.
Example: /projects/summit /azmiths.sgy
Provide a dip SEG-Y file. The file must contain delta values at the same inline, xline and depth as the velocity samples in the velocity model.
Example: /projects/summit /dip.sgy
Fixes and/or Changes
General
Recently viewed parameter files and the last opened directory information are stored in a hidden .tsunami file. The application previously wrote the .tsunami file to the directory from which the GUI was launched. When another user launched the GUI from the same directory, errors occurred because preferences from the previous user were used for the second user if permissions for the .tsunami file were closed. The .tsunami file is now stored in each user’s home directory to avoid these problems.
Pre-Stack Time Migration 5.8
Incorrect log file messages
Clients reported that PSTM would not read GCI data and received a log file report error #51:
WARNING: CDP X,Y byte locations not specified
Outputting CDP X byte 213 CDPY byte 217
Opening trace input file /hds21/gci/BeauregardPa_SW.PSDM1.gathinp2.GCId.1
ERROR #51: Invalid number of samples read from trace header
check byte location
Remove tmp file
Job aborting, got signal -1
Job aborting, got signal -1
Error code 0
The problem was that CDPX and CDPY were put in bytes 209 and 213 when an input byte location was not specified. Byte 209 is the default for the Migration distance. This is now fixed and CDPX and CDPY are in bytes 213 and 217 whenever an input byte location is not specified.
