Содержание
- 2. ProMAX Exercise What is ProMAX? A software package for processing reflection seismic data Commonly used in
- 3. Where did the data come from? A short seismic reflection survey in Papua New Guinea September
- 4. Woodlark Basin A rift basin in Papua New Guinea A classic place to study the orogenic
- 5. High Pressure Air Sources: The Air Gun Ready Fire! Fired Lower chamber has a top diameter
- 6. Airguns suspended from stowed booms Single Air gun – note air ports Air Guns Other source?
- 8. Summing the signal of multiple guns creates a more desirable signal Note the relative scales of
- 9. Listening Hydrophone Piezoelectric material Pressure changes in the water generate small currents which are amplified Geophone
- 10. How is a Marine Seismic Reflection Survey Shot? Definition of shot and common mid-point (CMP) gathers
- 30. Starting ProMAX Type Promax on the command line Select the survey Select the line that includes
- 31. Anatomy of ProMAX Click on the EW9910 area, then EW9910 Line ODP11 List of flows –
- 32. Anatomy of ProMAX Click on 01 – Display Shots List of individual processes – things we
- 33. Anatomy of ProMAX Click on Disk Data Input with the middle mouse button. This will parameterize
- 34. Anatomy of ProMAX Clicking on the data file 11 Shots w/geom with the left-hand mouse button
- 35. Anatomy of ProMAX Clicking on the data file 11 Shots w/geom with the left-hand mouse button
- 36. Displaying a Shot Clicking on Execute with the LHMB Direct ray path – sound travels directly
- 37. Water Velocity Clicking on the zoom icon. By holding down the LHMB and dragging a box,
- 38. Near-Trace Plot When we are collecting data we want to see it as quickly as possible
- 39. Near-Trace Plot Go back to the flow 02 – Near Trace Plot and uncomment Automatic Gain
- 40. Power Spectrum Go back the list of flows. Click on the flow 03 – Power Spectrum
- 41. Filtering We can use a bandpass filter to remove frequencies below and above a certain range.
- 42. Filtering For each shot a filtered and unfiltered (Control copy) version of the data is displayed.
- 43. Removing NMO The reason for having so many (24 in this case) traces in a CMP
- 44. Removing NMO in Practice – Velocity Analysis From Yilmaz, 1989 Go back to the flows list
- 45. Velocity Analysis Semblance plot CMP Click on the zoom icon and zoom into this area Dynamic
- 46. Velocity Analysis Click on the pick icon to pick velocity/time point on the semblance plot Click
- 47. Stacking Go back to the list of flows. Click on 06 – Stack This flow uses
- 48. View Stack Go back to the list of flows. Click on 07 – View Stack Execute
- 49. Migration In an un-migrated time section reflectors do not represent the true subsurface geometry. See examples
- 50. Migration Go back to the list of flows. Click on 08 – Migration Using a velocity
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