Kirchhoff migration for vertical seismic profiles

1984 ◽  
Author(s):  
Timothy H. Keho
Keyword(s):  
Seismic Profiles ◽  
Vertical Seismic Profiles ◽  
Kirchhoff Migration

Reconstruction of reflecting structures from vertical seismic profiles with a moving source

Geophysics ◽  
1986 ◽  
Vol 51 (10) ◽  
pp. 1923-1938 ◽  
Author(s):  
K. Köhler ◽  
M. Koenig
Keyword(s):  
Seismic Profile ◽  
Seismic Velocities ◽  
Reflection Point ◽  
Constant Depth ◽  
Seismic Profiles ◽  
Point Mapping ◽  
Resolution Power ◽  
Vertical Seismic Profiles ◽  
Kirchhoff Migration ◽  
Walkaway Vsp

When a vertical seismic profile (VSP) is recorded, the illuminated part of a reflector depends upon the shape and position of the reflector itself as well as on the seismic velocities and the positions of sources and receivers. A preferable arrangement for the investigation of structures of reflectors is to fix the receiver(s) at constant depth(s) in the well and move the source horizontally along a line at the Earth’s surface, usually called a “multioffset VSP” (MSP) or “walkaway VSP.” As a test of the resolution power of this survey geometry, synthetic records were generated from a subsurface model by inverse Kirchhoff migration. Three different methods were applied for the reconstruction. Wavefront construction leads to the correct shape of the reflectors, thus assuring the validity of the modeling method applied. Reflection‐point mapping delivered a near similarity to the model, but without focusing fault edges. Kirchhoff migration resulted in a detailed image of the reflectors with fault edges focused. Application of reflection‐point mapping and Kirchhoff migration to a real survey delivered results consistent with results from a survey at the Earth’s surface.

SH wave propagation by discrete wavenumber boundary integral modeling in transversely isotropic medium

1996 ◽  
Vol 86 (2) ◽  
pp. 524-529
Author(s):  
Hayrullah Karabulut ◽  
John F. Ferguson
Keyword(s):  
Transversely Isotropic ◽  
Boundary Integral ◽  
Boundary Integral Method ◽  
Interface Problem ◽  
Seismic Profiles ◽  
Sh Waves ◽  
Vertical Seismic Profiles ◽  
Flat Interface ◽  
Transversely Isotropic Media ◽  
Isotropic Media

Abstract An extension of the boundary integral method for SH waves is given for transversely isotropic media. The accuracy of the method is demonstrated for a simple flat interface problem by comparison to the Cagniard-de Hoop solution. The method is further demonstrated for a case with interface topography for both surface and vertical seismic profiles. The new method is found to be both accurate and effective.

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