Decoupled elastic prestack depth migration

Druzhinin, A.

doi:10.1016/j.jappgeo.2003.03.001

Cited by 11 publications

(14 citation statements)

References 34 publications

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“…Here we will focus on finite difference applications of the first‐order approximation to the Eikonal equation, and more specifically on the algorithm time3d by Podvin & Lecomte (1991). Ever since the publication of time3d , it has remained extensively used which is exemplified here in a few recent publications ranging over local earthquake tomographic studies (Kim et al 2005), converted seismic wave applications (Latorre et al 2004), pre‐stack depth migration (Druzhinin 2003), fat‐ray tomography (Husen & Kissling 2001), and for deriving starting models for full waveform inversion (Operto et al 2004). One of the reasons for its popularity is mainly its reliability and robustness in the presence of large velocity contrasts (e.g.…”

Section: Introductionmentioning

confidence: 99%

A traveltime reciprocity discrepancy in the Podvin & Lecomtetime3dfinite difference algorithm

Tryggvason¹,

Bergman²

2006

Geophysical Journal International

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S U M M A R YWe have found that the extensively used finite difference scheme time3d produces time fields which are 'asymmetric' in the sense that traveltimes computed to the right of the source are faster than traveltimes computed to the left. All finite difference schemes will, as they are approximations to the wave equation, to some extent fail to obey reciprocity perfectly. We show, however, that the errors in time3d may be significant-and unnecessarily large. An asymmetry in the point source initialization has been identified, and after correction time3d produces time fields with an improved reciprocity.

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Section: Introductionmentioning

confidence: 99%

A traveltime reciprocity discrepancy in the Podvin & Lecomtetime3dfinite difference algorithm

Tryggvason¹,

Bergman²

2006

Geophysical Journal International

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“…The latter was then used in PreSDM of the surface seismic data from various lines (Figure 13). Each line was migrated several times, using the full-wave decoupled PreSDM formula (Druzhinin, 2003) that honors elastic imaging conditions and minimizes cross-talk between various wave types. Input data were preprocessed shot gathers after GRT wavefield separation.…”

Section: Imaging Resultsmentioning

confidence: 99%

“…This is proving to be a major problem for seismic imaging in the North Atlantic margin, from Norway to Ireland. The purpose of this case study is to demonstrate that full-wave decoupled imaging (Druzhinin, 2003) combined with the special data preprocessing sequence (Druzhinin et al, 2004) may be promising for delineating complex basalt lava flows and identifying weak sub-basalt reflections. To minimize velocity uncertainties, the calibrated logs, seismic data and non-seismic measurements such as high-resolution gravity data should be processed together.…”

Section: Introductionmentioning

confidence: 99%

Full‐wave long offset seismic imaging and velocity analysis with gravity and well constraints — a case study from NW Corrib, offshore Ireland

Droujinine

Buckner

Cameron

2005

SEG Technical Program Expanded Abstracts 2005

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Long offset data from a recent marine streamer survey acquired in the Slyne Basin (NW Corrib, offshore Ireland) were reprocessed using advanced data pre-processing (source deconvolution, complex multiple attenuation and Radon-based wavefield separation), anisotropic velocity analysis and prestack time/depth full-wave imaging algorithms. Results of velocity analysis were constrained by borehole and gravity data to assist in the validation of interpretations. The focusing capabilities of symmetric wave modes have been analyzed and compared. Methods were incorporated into a single workflow tailored to identify key horizons below the top-basalt boundary.

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“…The GDRT is a discrete version of the Generalized Radon Transform (GRT) (Beylkin, 1982) that extends conventional linear or parabolic slant-stack data transformations used in seismic processing (Yilmaz, 2001). To obtain a good seismic image along the 2D profile, we have applied the GDRT PSDM workflow (Droujinine, 2003) aimed at effectively removing strong superfluous events (coherent noise) while enhancing weak valuable events, especially in the low frequency components of the data. Table 2 contains a list of principal events (both signal and noise) to be enhanced, migrated or attenuated.…”

Section: [ 2 Methodologymentioning

confidence: 99%

A study of sub-basalt depth imaging using the local Radon attributes on the Erlend Tertiary volcanic complex - North of Shetland, UK

Droujinine

Pajchel

Hitchen

2008

Netherlands Journal of Geosciences

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IAcquiring conventional 3 km towed streamer data along a 2D profile in the North of Shetland (UK) enables us to use the local Radon-attributes within the context of depth processing methodology for accurate delineation of volcanic units and imaging beneath high-velocity layers. The objective is to map the radially-dipping structure of the Erlend pluton and to investigate the potential existence of relatively soft Cretaceous sediments underneath volcanic units. Success in the Erlend Volcano study requires strict attention to the separation between different groups of events. The crucial point is the generalized discrete Radon transform formulated in terms of local wavefront (dip and curvature) characteristics. This transform is utilized during pre-CMP processing and migration to minimize event-coupling artefacts. These artefacts represent cross-talk energy between various wave modes and include the unwanted part of the wavefield. We show how to produce detailed subsurface images within the region of interest (exploration prospect only) by applying the closely tied processes of prestack event enhancement and separation, well-driven time processing for velocity model building, and final event-based prestack depth imaging. Results show enhanced structural detail and good continuity of principal volcanic units and deeper reflections, suggesting a faulted 0.6 -0.9 km thick layer of Cretaceous sediments in the proximity of well 209/09-1. Our interpretation complements existing low-resolution geophysical models inferred from gravity and wide-angle seismic data alone.

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Decoupled elastic prestack depth migration

Cited by 11 publications

References 34 publications

A traveltime reciprocity discrepancy in the Podvin & Lecomtetime3dfinite difference algorithm

A traveltime reciprocity discrepancy in the Podvin & Lecomtetime3dfinite difference algorithm

Full‐wave long offset seismic imaging and velocity analysis with gravity and well constraints — a case study from NW Corrib, offshore Ireland

A study of sub-basalt depth imaging using the local Radon attributes on the Erlend Tertiary volcanic complex - North of Shetland, UK

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