Seismic Attenuation from VSP and Well Log Data - NW Shelf Australia Case Study

Pevzner, Roman; Mueller, T.; Alasbali, A.; Galvin, Robert J.; Gurevich, Boris

doi:10.3997/2214-4609.20141604

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“…Therefore, this needs to be compensated for to provide a proper interpretation. A recent study has shown that high attenuation and anisotropy is the result of thin layering (Pevzner et al 2014a, b). In another study by Smoot et al (2013), it was observed that comparing calculated scattering with porosity, density and sonic (V p ) log plots reflected that 1/Q, in conjunction with the heterogeneity log plot, was a suitable instrument for categorising lithographical heterogeneities for the purpose of identifying possible hydrocarbon reservoirs.…”

Section: Introductionmentioning

confidence: 95%

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Estimation of seismic attenuation and prediction of VTI anisotropy parameters from VSP and log data: a case study from the Middle East

et al. 2016

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Quantitative interpretation of seismic data depends upon the amplitude analysis of reflected waves. However, the quality of the image obtained can be significantly affected by attenuation and anisotropy in the overburden. Therefore, the insights into the magnitude, sources and spatial distribution of these parameters may prove to be substantial for improving the quality of seismic image and reservoir characterisation. Both seismic vertical transverse isotropy (VTI) anisotropy and scattering attenuation could be caused by the layering. In order for these phenomena to play a major role, strong elastic contrasts between them are needed. In this paper, we present the case study from a typical setting in the Middle East where such a contrast between stiff carbonates and relatively soft siliciclastic sediments significantly deteriorates the quality of the seismic image. Vertical seismic profiling (VSP) and log data from one of the wells in the region are used to demonstrate this phenomenon. Apparent attenuation from VSP data is estimated using a modified centroid frequency shift method. The log data for seismic forward modelling is used in order to show that scattering could be a significant contributor to the apparent attenuation. In addition, by using both Backus averaging and synthetic walk-away VSP data analysis, we demonstrate that the same layering can be responsible for a significant TI anisotropy.

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Section: Introductionmentioning

confidence: 95%

“…A large number of methods for seismic attenuation analysis using VSP data have been proposed over the last 50 years (Pevzner et al 2014a, b). These methods employ changes in amplitude and wavelet shape (including shape of the amplitude spectra) for a body wave propagating through the attenuating media.…”

Section: Introductionmentioning

confidence: 99%