Can we use frequency shift due to attenuation for fizz water discrimination?

Abstract

In this abstract, we explore the viability of discriminating fizz water (low saturated gas sandstones) from commercial gas reservoirs based on the frequency shift (FS) caused by attenuation. Data from one well were used to build a simple geological model. Forward modeling of CDP gathers and normal incidence sections were carried out and their amplitude spectra were evaluated. For this study, we analyzed the FS in two different domains: 1. We tested the attenuation effect on the peak amplitude versus offset for the same seismic interface. 2. The peak frequency decay due to the presence of a high attenuating thin layer on normal incidence data.