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- W2336801350 abstract "Inversion of seismic data for earth parameters involves two main steps: (1) estimate the reflectivity as a function of incidence angle for each point in the subsurface, and (2) in accordance with some mathematical model, invert the reflectivity to estimate the corresponding earth parameters. As simple as this observation may seem at first sight, there are many challenges associated with both of these steps. In conjunction with the extensive, up to date bibliography compiled here, it is my hope that my humble perspective on these issues will benefit the active researcher of seismic inversion theory. OVERVIEW Conventional AVO (amplitude variation with offset) analysis is based on the wellknown Knott-Zoeppritz equations (Knott, 1899, and Zoeppritz, 1919). For a planar interface between two homogeneous isotropic elastic halfspaces in welded contact, these equations describe the various reflection and transmission coefficients for plane waves as a function of angle of incidence, the elastic constants and the densities of the two halfspaces (see e.g., Aki and Richards, 1980). Although these assumptions may appear rather restrictive, they nevertheless play a central role in the so-called forward problem of reflection seismology. This forward problem “consists of the determination of the data that would be recorded for a given subsurface configuration ... under the assumption that given laws of physics hold.” (Treitel and Lines, 2000). The corresponding inverse problem of reflection seismology, then, is nothing but the determination of the subsurface configuration from the observed data. What exactly is meant by subsurface configuration is open to debate. Practically speaking, I take it to mean the spatially varying elastic parameters -- this of course assumes that the data can be reasonably forward modelled by elasticity theory. Thus, for example, this assumes that any Q effects can be handled separately." @default.
- W2336801350 created "2016-06-24" @default.
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- W2336801350 date "2003-01-01" @default.
- W2336801350 modified "2023-09-27" @default.
- W2336801350 title "AVO and AVA inversion challenges: a conceptual overview" @default.
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