Accession Number:

ADA156394

Title:

Analysis of Two-Parameter Constant Background Born Inversion for Acoustic Synthetic Data.

Descriptive Note:

Technical rept.,

Corporate Author:

COLORADO SCHOOL OF MINES GOLDEN CENTER FOR WAVE PHENOMENA

Personal Author(s):

Report Date:

1985-05-15

Pagination or Media Count:

135.0

Abstract:

This thesis examines the usefulness of the two-parameter Born inversion method of Clayton and Stolt under idealized conditions. We implement a constant background procedure to reconstruct line source synthetic data which simulate a stratified acoustic medium. Specifically, this investigation is an extension of the single interface work for double interface models. Since we use offset data to recover one-dimensional bulk modulus and density variations, this procedure is termed a 1.5 dimensional inversion. Implicit in these reconstructed acoustic profiles are errors related to the approximate inversion. Phase shifts inherent in the modeled wave field cause these inversion errors not only to propagate, but also to increase with depth. Since the model data are exact, we are able to examine the analytic expressions of these inversion artifacts. From this analysis, we develop an implementation which minimizes inversion errors. This is achieved by both preconditioning the offset data, and judiciously choosing a reference velocity in accordance with inversion goals. Both of these procedures however provide limited improvement, and we conclude that this constant background, frequency domain, method should be enhanced by more sophisticated algorithms. Specifically, we suggest the implementation of either a variable background procedure, or the refinement algorithm of Hagin and Cohen. Keywords Seismic inversion born two-parameter constant background stratified acoustic medium.

Subject Categories:

  • Acoustic Detection and Detectors
  • Seismic Detection and Detectors

Distribution Statement:

APPROVED FOR PUBLIC RELEASE