NEW STRATA FEATURES

1. NEW STRATA FEATURES • Multi-2D Line Super Volumes • Improved Coloured Inversion • LMR Seismic Transform • Model-building with Time-Velocity Tables • Default to a Smooth Initial Model • Frequency Domain Merge • Map Utilities • Arbitrary Line Improvements

2. Improved Colour Inversion The Coloured Inversion has been up-dated and improved and allows much more flexibility in the parameter selection. Projects can now have multiple operators which may be used in different inversion runs. The low frequency component from the initial model can now be added to the high-frequency coloured inversion to yield the full geological spectrum.

3. Improved Colour Inversion Click on the “Run Spectral Analysis and Create Inversion Operator” to create a new Coloured Inversion operator.

4. Improved Colour Inversion The individual wells in the AI log-frequency crossplot can now be highlighted. As well, the user is now able to modify the regression line in this crossplot.

5. Improved Colour Inversion The seismic frequency spectrum has two parameters that allow modification: the Frequency Smoother and the Spectrum Threshold. The Frequency Smoother applies a high-pass filter to the seismic data and creates a smoother inversion operator. The Spectrum Threshold controls the threshold for computing the inversion operator: a threshold near 0 % may yield a better operator – but also becomes unstable if some of the frequency components are 0 or near-zero amplitude.

6. Improved Colour Inversion The operator frequency spectrum can be modified by adjusting the minimum and maximum frequencies. Filtering the operator can remove spikes at the spectrum extremes that may be due to near-zero seismic frequency content.

7. Improved Colour Inversion The time response of the inversion operator can be modified by adjusting the operator length and the taper length.

8. Improved Colour Inversion When you are satisfied with the operator, click OK on the Spectral Analysis window. This action will prompt you to name the operator and save it to the project. You can create as many operators as you want and selectively use the operator you want to apply.

9. LMR Seismic Transform The Lambda-Mu-Rho (LMR) Transforms are now a fully automatic process in Strata. Formerly, the user had to create the Lambda-Rho and the Mu-Rho volumes by using Trace Maths . This could a tricky task if you haven’t written an AVO Ph.D. dissertation in recent years and you were a bit rusty on the latest theory. We’ve simplified it now so that all you need to do is push a few buttons.

10. LMR Seismic Transform A few things are needed to create the LMR volumes: (1) a P-Impedance volume, (2) the S-Impedance volume and (3) the output volume name are specified on the first menu…

11. For a description of the significance of the constant c, please refer to Russell et al., “Fluid-property discrimination with AVO: A Biot-Gassmann perspective”, Geophysics, Jan 2003, 68, 1, p 29 -39 LMR Seismic Transform And (4) the constant c for the Lambda-Rho volume is specified on the second menu.

12. LMR Seismic Transform After entering these values, click OK and system automatically generates the corresponding Lambda-Rho and Mu-Rho volumes.

13. LMR Seismic Transform Complete the LMR process by cross-plotting the two attribute volumes, define and project the zones onto the seismic volume.

14. Model-building with Time-Velocity Tables Now, rather than always relying on well logs to build the initial model, you can create the model using a time-velocity table. You can either manually enter the Time-Velocity pairs into a table or you can import the Time-Velocity file directly.

15. Model-building with Time-Velocity Tables Click the Enter Table button to display the T-V Entry Menu. You can either manually enter the TV table here or you can import the TV Table by clicking on the Control button…

16. Model-building with Time-Velocity Tables If you choose to import the TV table, you must specify the format of the file that is being entered and its contents (e.g.., interval or RMS velocity).

17. Default to Low Frequency Model By default, Strata now automatically creates a 10 Hz high-cut filtered initial model. You have the options to change this if you wish…

18. Frequency Domain Merge With the new Frequency Domain Merge option you have the ability to combine two volumes of different frequencies into one new volume. An example of when to use this option would be, if you had an inversion result you wanted to combine with a filtered log model.

19. Frequency Domain Merge On the second page of the process you will need to specify the frequency range that overlaps between the two data sets, along with a taper length. Once this is completed the software will run the Frequency Domain Merge and create a new volume for you.

20. STRATA AVO EMERGE Map Utilities New map functionalities for all of our software have been added. These new utilities allow you to manipulate and modify the maps in your project.

21. Map Utilities The Map Operations utility allows you to apply some simple mathematical functions to either a single map or a pair of maps.

22. Map Utilities The Map Filter utility allows you to apply either a Running Average Filter or a Median filter on any map in your project. Click on the Next button to specify the window length.

23. Map Utilities The Map Maths utility allows you to programmatically manipulate any maps in your project. This feature is similar to our popular Trace Maths and Log Maths utilities. First, select the input maps for the Map Maths…

24. Map Utilities Then specify the output map name…

25. Map Utilities The geometry information…

26. Map Utilities Rename the input slice variable names if you want…

27. Trace Maths documentation can be found on the HRS web-site at: http://www.hampson-russell.com/support-tracemath.htm Map Utilities And enter in the formula that you would like to use. The syntax for Map Maths is similar to the C-based Trace Maths utility and allows for logical expressions such as if() … else ().

28. Arbitrary Line Improvements You now have several new option when creating your Arbitrary line. Create new nodes at well location: This option allows you to make a node point at one or more well locations OR Create new nodes along a deviated well: This option allows you to create nodes along a deviated well’s bore whole. The resulting arbitrary line will consist of the Inlines, and Cross Lines the bore whole cuts across.

29. Arbitrary Line Improvements Extract only the trace at the node location: This option will extract only the node points selected and none of the seismic that exists between node points. List previous arbitrary lines: This option pulls up a menu of existing arbitrary lines that you can then apply to the current arbitrary line or delete old lines.

30. Arbitrary Line Improvements Insert a node: This button allows you to insert a new node point. Delete all nodes: This button allows you to delete all existing node points within the current arbitrary line. Delete selected nodes: This button allows you to delete selected node points within the current arbitrary line.