3D Wave-equation Interferometric Migration of VSP Free-surface Multiples Ruiqing He University of Utah Feb., 2006.

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Presentation transcript:

3D Wave-equation Interferometric Migration of VSP Free-surface Multiples Ruiqing He University of Utah Feb., 2006

Outline Introduction Wave-equation Interferometric Migration (WEIM) A Synthetic Test Application to A Field 3D VSP Data Set Conclusion

Outline Introduction Wave-equation Interferometric Migration (WEIM) A Synthetic Test Application to A Field 3D VSP Data Set Conclusion

Introduction Migration of VSP multiples has a larger imaging area than migration of primaries.

Mirror image Published Methods Mirror imaging condition: transfer to a migration of primaries imaging condition. Real model Crosscorrelation migration: transfer VSP Crosscorrelation migration: transfer VSP data to CDP data. data to CDP data.

Difficulties Crosscorrelation is not cheap. Kirchhoff migration is not cheap. Ray tracing. Ray tracing. Storage of time tables. Storage of time tables. 3D. 3D.

Outline Introduction Wave-equation Interferometric Migration (WEIM) A Synthetic Test Application to A Field 3D VSP Data Set Conclusion

WEIM Reciprocity

Line-source Ray tracing Known medium Unknown medium The picked time is imposed as an initial condition in ray tracing.

Advantages of WEIM Experience similar velocity estimation errors as migrating CDP primaries. For each receiver gather, only one line- source ray tracing, and one wavefield extrapolation is needed. In 3D VSP, the saving of ray tracing and timetable storage is enormous.

Outline Introduction Wave-equation Interferometric Migration (WEIM) A Synthetic Test Application to A Field 3D VSP Data Set Conclusion

2D Synthetic Test Offset (m) Depth (m) Offset (m) Time (s) 0 5 Synthetic model Synthetic data 12 geophpnes 600 shots

Migration Comparison Offset (m) Depth (m) Migration of primaries Migration of multiples Offset (m) Depth (m)

Outline Introduction Wave-equation Interferometric Migration (WEIM) A Synthetic Test Application to A Field 3D VSP Data Set Conclusion

Acquisition Geometry 12 geophones at an interval of m. ~ 11 km ~ 4.5 km deep

2D WEIM Result Offset (km) Depth (m)

3D WEIM Result Migration of only one receiver gather

Slice Movie Migration of only one receiver gather

Outline Introduction Wave-equation Interferometric Migration (WEIM) A Synthetic Test Application to A Field 3D VSP Data Set Conclusion

Conclusion Proposed 3D WEIM, which is very efficient for migrating 3D VSP multiples. Migration of 3D VSP free-surface multiples provides an imaging area comparable to a conventional 3D CDP survey, yet the data processing cost is much reduced.

Acknowledgement Thanks to UTAM 2005 sponsors for financial support.