1. MEO WA360P – Merge Test 0100 Survey Merge Analysis (Gross Amplitude) Date 12/6/2014

2. Following the re-gridding of the Foxhound, Artemis3D and MEO3D surveys to a common grid (based on Artemis 3D Grid), three crosslines 3600, 4000 and 5000 were extracted from the supplied Radon Demultiple data. These were stacked, the amplitude was grossly corrected as follows: For Foxhound a factor of 0.0012 was applied to the data samples and a 2dB/sec gain was applied. For Artemis3D a scale factor of 0.43 was applied to the datasamples and a 5dB/sec gain was applied. The MEO data wasn’t changed. Surveys and Test Crosslines Foxhound Artemis MEO Rosie XL5000 XL4000 XL3600

3. Raw Stacks Crossline 3600 FoxhoundArtemis MEO

4. Post Correction Stacks - Crossline 3600 FoxhoundArtemis MEO

5. Raw Amplitude Decay - Crossline 3600 FoxhoundArtemisMEOArtemis

6. Post Correction Amplitude Decay - Crossline 3600 FoxhoundArtemis MEO

7. Raw Stacks Crossline 4000 Foxhound Artemis MEO

8. Post Correction Stacks - Crossline 4000 Foxhound Artemis MEO

9. Raw Amplitude Decay - Crossline 4000 FoxhoundArtemisMEOArtemis

10. Post Correction Amplitude Decay - Crossline 4000 FoxhoundArtemisMEOArtemis

11. Raw Stacks Crossline 5000 FoxhoundArtemis MEO

12. Post Correction Stacks - Crossline 5000 Foxhound Artemis MEO FoxhoundArtemis MEO

13. Raw Amplitude Decay - Crossline 4000 FoxhoundArtemisMEOArtemis

14. Post Correction Amplitude Decay - Crossline 4000 FoxhoundArtemisMEOArtemis

15. Conclusions: The corrections applied to both Foxhound and Artemis appear to broadly bring the amplitudes into balance between the three surveys. There is however some unknown amplitude treatment that has been applied to the Foxhound dataset. Furthermore lateral velocity variations are evident and matching at the survey boundaries cannot be achieved with a single/simple function. The gross correction that has been applied is sufficient to allow further analysis of the data Recommendations: It is likely that a different dataset will be supplied for the Foxhound survey, so this analysis will have to be revisited when that dataset is available. It has been suggested that to account for the lateral variations in amplitudes between the surveys a CDP based balance calculated in a window surrounding the target zone be used. MEO has suggested that they supply the horizon grids to define the window.