Orthogonal wide azimuth surveys: Acquisition and imaging

Baldock, S.; Tang, Cristina Reta; Beck, Brad; Gao, Wei; Hightower, Steve; Doue, E.

doi:10.1190/1.3627482

Cited by 6 publications

(4 citation statements)

References 4 publications

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“…A seismic survey with the aspect ratio above 0.5 is known as a wide-azimuth survey, while a survey with the aspect ration below 0.5 is called a narrow-azimuth survey (Figure 1) (Wang et al, 2015;Cordsen & Galbraith, 2002;Baldock et al, 2012). In spite of its wide application, a narrow-azimuth seismic survey cannot render sufficient precision; instead, wide-azimuth seismic prospecting and even full-azimuth prospecting have been utilized in recent years due to increasingly proved effects.…”

Section: Introductionmentioning

confidence: 99%

“…In spite of its wide application, a narrow-azimuth seismic survey cannot render sufficient precision; instead, wide-azimuth seismic prospecting and even full-azimuth prospecting have been utilized in recent years due to increasingly proved effects. Compared with narrow-azimuth prospecting, wide-azimuth prospecting has following advantages (Hu et al, 2004;Baldock et al, 2012;Schoenberg et al, 1999). 1) There are more crossline folds and enhanced illumination to mitigate the influence of surface obstacles and subsurface shadows and improve seismic images.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Fault Identification Based on Wide-Azimuth Seismic Data: A Case Study in the Bohai Bay

Zhu¹,

Chen²,

Yong-jun³

et al. 2019

GEP

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Full-azimuth common reflection-angle gathers could be stacked at any azimuth. The stacked data at the azimuth perpendicular to fractures exhibit the largest azimuthal anisotropy, while the stacked data at the azimuth parallel to fractures exhibit the smallest azimuthal anisotropy. In petroleum exploration in Block A, a neritic province in the Bohai Bay, we use the stacked data at the azimuth perpendicular to fractures to improve fault interpretation. We also use attribute fusion to identify fractures in different directions.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Fault Identification Based on Wide-Azimuth Seismic Data: A Case Study in the Bohai Bay

Zhu¹,

Chen²,

Yong-jun³

et al. 2019

GEP

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show abstract

“…However, on the right side of the left images in Figure 1, dipping sediments are not well-imaged and create a dim zone at the same location in both images. The imaging resolution of those complex areas can be improved by increasing azimuthal illumination, as proposed, for example, with Orthogonal WAZ (Baldock 2011) and Rich Azimuth Acquisition (Howard 2007).…”

Section: Introductionmentioning

confidence: 99%

Staggered marine acquisition design for complex imaging

Mandroux

Ting

Montgomery

et al. 2013

SEG Technical Program Expanded Abstracts 2013

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We present a new staggered acquisition geometry aimed at providing improvements to complex imaging of the subsurface, such as subsalt in the Gulf of Mexico. The proposed design is a linear acquisition geometry that improves offset and azimuth distribution compared to preexisting wide azimuth acquisition techniques and generates extra-long offset of up to 18 km. It also includes a broadband solution, by towing streamers with variable depth shape, to provide significant imaging resolution uplift.

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“…Recently, a range of methods has been implemented to acquire data with even greater azimuthal information. Examples of this are orthogonal wide azimuth (OWAZ), (Baldock, 2011), rich azimuth (RAZ) surveys (Howard, 2007), and coil shooting (Moldoveanu and Kapoor, 2009). An OWAZ survey was acquired in order to obtain a geometry that approaches Full Azimuth (FAZ).…”

Section: Introductionmentioning

confidence: 99%

Orthorhombic Imaging for Orthogonal Wide Azimuth Surveys in Mississippi Canyon, Gulf of Mexico

Xiao¹,

He²,

Gersztenkorn³

et al. 2013

London 2013, 75th Eage Conference en Exhibition Incorporating SPE Europec

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In areas of complex geology, especially where fractures are present, azimuthal anisotropy needs to be seriously considered. Tilted Transverse Isotropy (TTI), which only considers polar anisotropy, is not sufficient for explaining moveout fluctuations detected in different azimuthal sectors. Orthorhombic anisotropy (ORT), which describes both azimuthal and polar anisotropy, provides a more comprehensive model than allowed by the simpler Transversely Isotropic (TI) model. In this paper we present a methodology for ORT model building and imaging. The effectiveness of ORT imaging is demonstrated through application to Orthogonal Wide Azimuth (OWAZ) data from the Gulf of Mexico (GoM). The process of orthorhombic model building is introduced and orthorhombic tomography is applied to invert for azimuth-dependent anisotropic parameters. By resolving the inconsistencies in residual moveout for different azimuths, it is demonstrated that ORT imaging improves gather flatness in all azimuths and produces better image focusing.

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Orthogonal wide azimuth surveys: Acquisition and imaging

Cited by 6 publications

References 4 publications

Fault Identification Based on Wide-Azimuth Seismic Data: A Case Study in the Bohai Bay

Fault Identification Based on Wide-Azimuth Seismic Data: A Case Study in the Bohai Bay

Staggered marine acquisition design for complex imaging

Orthorhombic Imaging for Orthogonal Wide Azimuth Surveys in Mississippi Canyon, Gulf of Mexico

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