Seismic Attenuation from VSP and Well Log Data: Approaches, Problems and Relative Contribution of Scattering
MetadataShow full item record
All methods for quantitative interpretation of seismic data are based on the analysis of amplitudes of seismic (reflected) waves. Seismic attenuation along the ray path of a wave significantly affects this amplitude information. As such, understanding of this phenomenon has a huge impact for the industry. For the last sixty years vertical seismic profiling (VSP) was an obvious method of choice for exploring this phenomenon in-situ. A large number of different approaches for attenuation estimation were introduced. We have tested a large number of these methods and developed a reasonably robust workflow for attenuation estimation based on the modified centroid frequency shift method. Seismic attenuation measured from seismic data (so-called apparent attenuation) comprises two different components, namely, transfer of the energy into heat (absorption) and scattering. We employ seismic modelling using finely layered model of the medium obtained from the log data as a part of the workflow to estimate relative contribution of scattering. In order to investigate causes and mechanisms of seismic attenuation we select~70 wells from several areas in Australia (primarily from NW Shelf) with publically-available high-quality well log, VSP data and geological information. In this presentation we show some preliminary results from this study.
Showing items related by title, author, creator and subject.
Pevzner, Roman; Greenwood, Andrew; Urosevic, Milovan; Gurevich, Boris (2013)Understanding of seismic attenuation plays an important role in successful application of seismic imaging and subsurface characterisation techniques based on amplitude analysis. Zero-offset vertical seismic profiling (VSP) ...
Pevzner, Roman; Gurevich, Boris; Tertyshnikov, Konstantin; Bona, Andrej; Vlasov, S. (2016)Attenuation affects seismic amplitudes during wave propagation and understanding of this phenomenon is therefore critical for successful reservoir characterisation. In some geological settings high contrasts in elastic ...
Manuel, Christopher D. (2002)The goal of oil and gas exploration using seismic methods is to accurately locate geological structures that could host such reserves. As the search for these resources tends towards more complex regions, it is necessary ...