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Paul Sava* Stanford University Sergey Fomel UT Austin (UC Berkeley)

Angle-domain common-image gathers. Paul Sava* Stanford University Sergey Fomel UT Austin (UC Berkeley). C ommon I mage G athers. Representations of the seismic events sorted by their location in the subsurface. Image domain offset-domain angle-domain. Classes of methods Kirchhoff

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Paul Sava* Stanford University Sergey Fomel UT Austin (UC Berkeley)

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  1. Angle-domain common-image gathers • Paul Sava* Stanford University • Sergey Fomel UT Austin (UC Berkeley)

  2. Common Image Gathers • Representations of the seismic events sorted by their location in the subsurface • Image domain • offset-domain • angle-domain • Classes of methods • Kirchhoff • Wave-equation • S-G migration • shot-profile migration

  3. Agenda Common-image gathers Definitions Offset vs. angle Computational space ADCIG methodology Examples

  4. Offset-Domain Common Image Gathers h h z z Kirchhoff Wave-equation flat events focused events

  5. Angle-Domain Common Image Gathers g g z z Kirchhoff Wave-equation flat events flat events

  6. Example

  7. Agenda Common-image gathers Definitions Offset vs. angle Computational space ADCIG methodology Examples

  8. Reflection scheme Source Receiver 2h g g V(x,y,z) a g g v

  9. Wave-equation ADCIG methods x-domain (slant-stack) k-domain (RTT) IMAGE space DATA space Reflection angle (g) Offset ray-parameter (ph)

  10. Agenda Common-image gathers Definitions Offset vs. angle Computational space ADCIG methodology Examples

  11. Wave-equation CIGs: example ODCIG ADCIG

  12. ADCIG: g vs. ph

  13. Summary • CIG domains • offset or angle • CIG concepts • flatness: Kirchhoff • focusing: wave-equation • Wave-equation ADCIG • data space • image space

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