Multiple suppression in the t-x-p domain

Multiples in seismic data pose serious problems to seismic interpreters for both AVO studies and interpretation of stacked sections. Several methods have been practiced with varying degrees of success to suppress multiples in seismic data. One family of velocity filters for demultiple operations using Radon transforms traditionally face challenges when the water column is shallow. Additionally, the hyperbolic Radon Transform can be computationally expensive. In this thesis, I introduce a novel multiple suppression technique in the t-x-p domain, where p is the local slope of seismic events that aims at tackling some of the aforementioned limitations, and discuss the advantages and scope of this approach. The technique involves essentially two steps: the decomposition part and the suppression part. Common Mid-Point (CMP) gathers are taken and transformed from the original t-x space to the extended t-x-p space and eventually to the t0-x-p space, where t0 is the zero offset traveltime. Multiplication of the gather in the extended space with Gaussian tapering filters, formed using the difference of the powers of the intrinsically calculated velocities in terms of t0 , x and p using analytical relations and the picked primary velocities and stacking along the p axis produces gathers with multiples suppressed.

Name thesis:degree_name

Master of Science in Geological Sciences

Level thesis:degree_level

Masters

Discipline thesis:degree_discipline

Geological Sciences

Grantor

The University of Texas at Austin

Year dc:date.issued

2013

Author dc:creator

• Ghosh, Shaunak

Advisor dc:contributor.advisor

• Fomel, Sergey B.

• Multiples
• Decomposition
• Radon transform
• t-x-p domain
• Gaussian tapering filters

Language dc:language.iso

en_US

Handle dc:identifier.uri

http://hdl.handle.net/2152/23207

OAI identifier oai:identifier

oai:repositories.lib.utexas.edu:2152/23207