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HOCIGs and VOCIGs via Two-way Reverse Time Migration

HOCIGs and VOCIGs via Two-way Reverse Time Migration. William Symes, Fuchun Gao Rice University. TRIP Oct 29, 2004. Outline. Common image gathers (offset domain) 1. Theory 2. HOCIGs and VOCIGs--- examples Conclusions. Two-way Reverse Time Migration.

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HOCIGs and VOCIGs via Two-way Reverse Time Migration

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  1. HOCIGs and VOCIGs via Two-way Reverse Time Migration William Symes, Fuchun Gao Rice University TRIP Oct 29, 2004

  2. Outline • Common image gathers (offset domain) 1. Theory 2. HOCIGs and VOCIGs--- examples • Conclusions

  3. Two-way Reverse Time Migration 1. Forward propagation: finite difference solution to acoustic equation by where : impedance matrix. : seismic wave field vector. : source vector. Pratt et al.(1998)

  4. Two-way Reverse Time Migration ( : complex conjugate) 2. Back-propagation of data 3. Horizontal offset image (frequency domain) Vertical offset image (frequency domain) Common image gathers (time domain): where : recorded wave fields. : back-propagated waves : source location. : image location

  5. Example 1 No. of source = 51 No. of receiver = 51 Source interval =10m Receiver interval=10m

  6. Frequency domain CIGs

  7. Frequency domain CIGs, tapered

  8. time domain CIGs

  9. Example 2 No. of source =101 No. of receiver = 101 Source interval =1.5m Receiver interval=1.5m

  10. Time domain Frequency domain HOCIGs

  11. Example 3

  12. VOCIGs

  13. HOCIG Filtered HOCIG

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