Shot-profile true amplitude crosscorrelation imaging condition

Arntsen, Børge; Kritski, A.; Ursin, Bjørn; Amundsen, Lasse

doi:10.1190/geo2012-0211.1

Cited by 2 publications

(1 citation statement)

References 16 publications

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“…This partly compensates for the effects of wave propagation, in particular removes the geometrical spreading. A true-amplitude imaged data (Arntsen et al, 2010) can be inverted directly for seismic parameters based on equations 4-6. However, conventional trueamplitude migration algorithms are not valid for the near-critical and postcritical angles because they are designed for the reflected waves only, and do not treat the amplitudes of the head waves correctly.…”

Section: Discussionmentioning

confidence: 99%

The effect of interface curvature on AVO inversion of near-critical and postcritical PP-reflections

et al. 2012

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Widely exploited in the industry, amplitude-variation-withoffset (AVO) inversion techniques are based on weak-contrast approximations of the plane-wave reflection coefficients. These approximations are valid for plane waves reflected at almost flat interfaces with weak contrasts in seismic parameters and for reflection angles below the critical angle. Regardless of the underlying assumptions, linearized coefficients provide a simple and physically adequate tool to accurately invert AVO data for seismic parameters at precritical angles. However, the accuracy of linearized coefficients drastically decreases with increasing incidence angle. Limitations occur around and beyond the critical ray, where the effect of wavefront curvature becomes prominent and thus can no more be neglected. The effective reflection coefficients generalize the plane-wave reflection coefficients for waves generated by point sources and reflected at curved interfaces. They account for the wavefront curvature and are adequate at any incidence angle. Our previous studies have shown that including the reflections around and beyond the critical angle in the AVO inversion significantly improves the accuracy of estimated parameters. However, the interface curvature also must have its contribution to the longoffset AVO inversion. We find that the interface curvature affects the energy propagation along the ray tube and the energy diffusion across the ray tube. The energy propagation along the tube is characterized by the geometrical spreading, which is strongly affected by interface curvature. The transverse diffusion is captured by the effective reflection coefficients which are less influenced by interface curvature. The long-offset AVO inversion is thus sensitive to interface curvature through a combination of several wave propagation factors.

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Section: Discussionmentioning

confidence: 99%

The effect of interface curvature on AVO inversion of near-critical and postcritical PP-reflections

et al. 2012

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Full-volume 3D seismic interpretation methods: A new step towards high-resolution seismic stratigraphy

Paumard

Bourget

Durot³

et al. 2019

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Following decades of technological innovation, geologists now have access to extensive 3D seismic surveys across sedimentary basins. Using these voluminous data sets to better understand subsurface complexity relies on developing seismic stratigraphic workflows that allow very high-resolution interpretation within a cost-effective timeframe. We have developed an innovative 3D seismic interpretation workflow that combines full-volume and semi-automated horizon tracking with high-resolution 3D seismic stratigraphic analysis. The workflow consists of converting data from seismic (two-way traveltime) to a relative geological time (RGT) volume, in which a relative geological age is assigned to each point of the volume. The generation of a horizon stack is used to extract an unlimited number of chronostratigraphic surfaces (i.e., seismic horizons). Integrated stratigraphic tools may be used to navigate throughout the 3D seismic data to pick seismic unconformities using standard seismic stratigraphic principles in combination with geometric attributes. Here, we applied this workflow to a high-quality 3D seismic data set located in the Northern Carnarvon Basin (North West Shelf, Australia) and provided an example of high-resolution seismic stratigraphic interpretation from an Early Cretaceous shelf-margin system (Lower Barrow Group). This approach is used to identify 73 seismic sequences (i.e., clinothems) bounded by 74 seismic unconformities. Each clinothem presents an average duration of approximately 63,000 years (fifth stratigraphic order), which represents an unprecedented scale of observation for a Cretaceous depositional system on seismic data. This level of interpretation has a variety of applications, including high-resolution paleogeographical reconstructions and quantitative analysis of subsurface data. This innovative workflow constitutes a new step in seismic stratigraphy because it enables interpreters to map seismic sequences in a true 3D environment by taking into account the full variability of depositional systems at high frequency through time and space.

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Shot-profile true amplitude crosscorrelation imaging condition

Cited by 2 publications

References 16 publications

The effect of interface curvature on AVO inversion of near-critical and postcritical PP-reflections

The effect of interface curvature on AVO inversion of near-critical and postcritical PP-reflections

Full-volume 3D seismic interpretation methods: A new step towards high-resolution seismic stratigraphy

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