Date of Award

2016

Document Type

Open Access Master's Thesis

Degree Name

Master of Science in Geophysics (MS)

Administrative Home Department

Department of Geological and Mining Engineering and Sciences

Advisor 1

Wayne D. Pennington

Advisor 2

Greg P. Waite

Committee Member 1

Mir Sadri

Abstract

The goal of this study is to compare three different type of seismic filtering according to their inversion results and their quality of data improvements. To do this bandpass filter, Inverse Q, and Radon transform are applied to the original NMO corrected pre-stack data from Nova-Scotia offshore Canada.

The seismic data used was provided as pre-stack data of generally good quality. The test for quality of data improvement comes from the results of inversion based on different types of filtering performed on the pre-stack gathers.

Bandpass filter, Inverse Q, and Radon transform are applied to the migrated prestack data, over the time range of 0-6000 ms. The Radon transform yields a better seismic image than the bandpass and inverse Q filters, since it removes the noise and the multiples from the data quite efficiently. The respective data volumes were inverted for acoustic impedance using simultaneous prestack inversion. The Radon filtered data provided the best inversion results, based on the continuity of layers and lack of apparent artifacts or noise. The Radon filter does not appreciably alter the frequency content of the data while removing events with moveout inconsistent with primary arrivals. It is likely that the processed data provided originally contained an excellent wavelet, and the other filters were unable to improve upon it, but did diminish the information present, particularly at the lower frequencies, decreasing the quality of the inversion results.

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