Diffraction Imaging By Multifocusing 2009

GEOPHYSICS, VOL. 74, NO. 6 共NOVEMBER-DECEMBER 2009兲; P. WCA75–WCA81, 9 FIGS. 10.1190/1.3198210 Diffraction imaging by multifocusing Alex Berkovitch1, Igor Belfer1, Yehuda Hassin1, and Evgeny Landa2 The energy of diffracted waves usually is weaker than that... More

GEOPHYSICS, VOL. 74, NO. 6 共NOVEMBER-DECEMBER 2009兲; P. WCA75–WCA81, 9 FIGS. 10.1190/1.3198210 Diffraction imaging by multifocusing Alex Berkovitch1, Igor Belfer1, Yehuda Hassin1, and Evgeny Landa2 The energy of diffracted waves usually is weaker than that of ABSTRACT specular reflections. Diffractions essentially are lost during the con- ventional processing/migration sequence, or they are masked in con- Correct identification of geologic discontinuities, such as ventional seismic stacked sections. Local structural and lithological faults, pinch-outs, and small-size scattering objects, is a pri- elements in the subsurface of a size comparable to the wavelength mary challenge of the seismic method. Seismic response usually are ignored during processing and identified only during in- from these objects is encoded in diffractions. Our method im- terpretation. Conventional common-midpoint 共CMP兲 moveout cor- ages local heterogeneities of the subsurface using diffracted rections do not appr Less