Accession Number:

ADA252740

Title:

Velocity Analysis by Residual Moveout

Descriptive Note:

Technical rept. for 1 Jan 1991-30 Sep 1992

Corporate Author:

COLORADO SCHOOL OF MINES GOLDEN CENTER FOR WAVE PHENOMENA

Personal Author(s):

Report Date:

1992-05-01

Pagination or Media Count:

23.0

Abstract:

Velocity analysis by normal moveout encounters problems in handling dipping reflectors or lateral variation of velocity. Prestack migration provides a powerful tool to do velocity analysis, which is based on the following principle the imaged depths at a common location are independent of source- receiver offset when the correct velocity is used. Conventional approaches, such as depth focusing analysis, generally involve iteration, which requires repeated prestack migration. In this paper, a residual moveout method for velocity analysis on multi-offset data is presented that needs only a single prestack migration. A number of theoretical problems in this method are studied. When the velocity has a lateral anomaly, we derive a formula to calculate the interval velocity from the stacking velocity by perturbation theory. A suggested data processing technique based on our method is composed of prestack migration with a constant velocity, velocity analysis, residual moveout, stacking, velocity conversion, and poststack residual migration.

Subject Categories:

  • Seismology

Distribution Statement:

APPROVED FOR PUBLIC RELEASE