Azimuthal Residual Velocity Analysis in Offset Vector for WAZ Imaging

Lecerf, D.; Navion, Sylvain; Boëlle, Jean-Luc; Belmokhtar, Ahmed; Ladmek, Abdeljebbar

doi:10.3997/2214-4609.201400413

Cited by 25 publications

(18 citation statements)

References 5 publications

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“…To investigate whether step 4 is necessary, snail gathers may be displayed (Lecerf et al, 2009). Each snail gather is in fact a CIG, now sorted according to increasing azimuth in each offset range (select the data sorted in the inline offset/crossline offset domain following a spiral starting in the center).…”

Section: Amplitude Variation With Azimuthmentioning

confidence: 99%

“…The employers of Cary (Sensor Geophysical) and Starr (PGS) applied the idea from the start, but it took almost 10 years before the rest of the industry picked it up (Calvert et al, 2008a(Calvert et al, , 2008bPerz and Zheng, 2008;Lecerf et al, 2009). …”

Section: Introductionmentioning

confidence: 97%

“…CIG with increasing azimuth within each offset range (500-ms time window): (a) before azimuthal residual moveout, (b) after azimuthal residual moveout using a parabolic elliptical model (afterLecerf et al, 2009).…”

mentioning

confidence: 99%

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3D Seismic Survey Design, Second edition

Vermeer¹

2012

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Section: Amplitude Variation With Azimuthmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 97%

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3D Seismic Survey Design, Second edition

Vermeer¹

2012

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“…OVT processing has the advantage of preserving offset and azimuthal information even after migration, which enables optimization of the stack after applying an azimuthally variant residual velocity correction (Lecerf et al, 2009).…”

Section: Wide-azimuth Processingmentioning

confidence: 99%

A large-scale validation of OBN technology for time-lapse studies through a pilot test, deep offshore Angola

Boëlle¹,

Brechet²,

Ceragioli³

et al. 2012

The Leading Edge

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In early phases of offshore field development, repeated marine seismic surveys recorded with towed streamers have been successfully processed to image changes in reservoir fluids through time and hence have contributed to important reservoir development decisions such as elaborating future production and injection plans. In such cases, the negative impact of surface or underwater obstacles on the final image has been mitigated using undershooting strategies. Nevertheless, even in the most favorable cases, this has been achieved at the expense of 4D repeatability because short-offset illumination is missing in the undershoot survey and the azimuthal distribution within the offset classes becomes inconsistent with the base streamer data. As the field development proceeds, especially in deep offshore contexts, a complex network of in-sea and subsea installations is progressively put in place and the Health, Safety, and Environmental (HSE) issues related to seismic vessels or recording cables coming close to production facilities can no longer be neglected, making the conventional streamer or OBC acquisitions challenging, or simply not feasible. As a result, industry is proposing a “sea-floor receiver” solution with ocean-bottom nodes (OBN) for imaging and monitoring reservoir production below infrastructures. OBN are autonomous seismic recording systems deployed on the seafloor with remotely operated vehicles (ROVs). Previous tests and studies (Boelle et al., 2005; Ceragioli et al., 2006) have shown that OBN technology may be appropriate for reservoir monitoring. Here we present the results of the first large-scale OBN project completed by Total E&P Angola, between September 2008 and April 2009, over the deep-water Dalia Field, Block 17, with the aim of validating the use of this technology for 4D seismic reservoir monitoring.

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“…Lecerf et al (2009) have proposed the "snail gather", where the traces are sorted by increasing azimuth within each offset range; the width of each offset class being equal to two times the interval between shot (receiver) lines. To visualize and analyse this 3D volume, it is convenient to choose a sorting of seismic traces which enables to capture the azimuthal variations.…”

Section: Iptc 13870 Wide Azimuth Seismic Azimuthal Analysis In Offsetmentioning

confidence: 99%

Wide Azimuth seismic: azimuthal analysis in offset vector domain for velocity and amplitude

Boëlle

Lecerf²,

Navion³

et al. 2009

All Days

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TX 75083-3836, U.S.A., fax +1-972-952-9435. AbstractIn 2005 a 3D high density wide-azimuth seismic survey was shot over the Irharen area (south east of Timimoun, Algeria). This acquisition was designed to better image the structure but also to improve fracture characterization and mapping, recognized as key in the description of this tight sand reservoir. The use of the offset vector binning concept, introduced by Cary (1999) and Vermeer (2002), on dense wide azimuth datasets is well suited for preserving the azimuthal information. An azimuthal residual velocity analysis based on semblance optimisation by scanning isotropic and anisotropic components of a parabolic elliptical model is proposed and tested successfully. The significant imaging improvement achieved with this land data case demonstrates the accuracy of the extracted azimuthal parameters for a better post-PSTM azimuthal residual moveout. After this correction, Common Image Gathers are ready for an azimuthal analysis of amplitudes. Taking advantage of the good sampling in offset and azimuth directions, the present study investigates the potential of Fourier analysis for describing the azimuthal variations of seismic amplitude.

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Azimuthal Residual Velocity Analysis in Offset Vector for WAZ Imaging

Cited by 25 publications

References 5 publications

3D Seismic Survey Design, Second edition

3D Seismic Survey Design, Second edition

A large-scale validation of OBN technology for time-lapse studies through a pilot test, deep offshore Angola

Wide Azimuth seismic: azimuthal analysis in offset vector domain for velocity and amplitude

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