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• W2025536557 startingPage "1593" @default.
• W2025536557 abstract "The presence of high‐velocity, highly heterogeneous layers such as basalt have a detrimental effect on imaging below those structures. Internal characteristics of the basalt itself can also degrade the subbasalt image quality. In many cases the boundary surfaces of a basalt sequence are not smooth but contain some roughness at a scale similar to the seismic wavelength. Interface scattering resulting from interface roughness can be a serious problem. In this paper, body and interface scattering problems are addressed through acoustic finite‐difference modeling. Interface scattering seems to have the most detrimental effect on imaging at depth. A wave equation prestack datuming procedure is applied to synthetic acoustic data to remove the effects of rough interfaces. This computational process transforms seismic data to a new datum plane in the subsurface, eliminating propagation effects between the surface and the new datum plane. The technique leads to a much improved image of below the basalt, with the great advantage that accurate knowledge of the velocity field for the overburden only is required as opposed to the entire velocity‐depth model (e.g., for prestack depth migration)." @default.
• W2025536557 created "2016-06-24" @default.
• W2025536557 creator A5018256068 @default.
• W2025536557 creator A5045751575 @default.
• W2025536557 date "2002-09-01" @default.
• W2025536557 modified "2023-10-03" @default.
• W2025536557 title "Interface scattering versus body scattering in subbasalt imaging and application of prestack wave equation datuming" @default.
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• W2025536557 doi "https://doi.org/10.1190/1.1512750" @default.
• W2025536557 hasPublicationYear "2002" @default.
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