Orthogonal wide azimuth surveys: acquisition and imaging

Baldock, S.; Reta-Tang, Cristina; Beck, Brad; Gao, Wei; Cai, Jun; Hightower, Steve

doi:10.3997/1365-2397.2012012

Cited by 4 publications

(2 citation statements)

References 5 publications

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“…Wide azimuth (aspect ratio is greater than 0.5) seismic exploration of space imaging resolution is higher than the narrow azimuth [19]. Multiple abroad exploration examples prove that the orthogonal wide azimuth acquisition [20] and full azimuth double helix [21] acquisition is helpful to overcome the shielding effect of salt dome strong reflection and improve the salt dome imaging. The widely-distributed volcanic of the area has shielding effect on the under layer, which can cause energy shadow.…”

Section: Observation Azimuthmentioning

confidence: 99%

3D Seismic Acquisition Technology and Effect in HX Volcanic Area in Liaohe Depression

Wang¹,

Liu²,

Zou³

et al. 2016

IJG

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Multi-stages volcanic are available in HX area, shielding the seismic waves. Previous seismic acquisitions of large size bin, less fold coverage and narrow azimuth result in indistinct fault images, low S/N ratio and the difficulty of multi-stages volcanic characterization. In reference to the successful experience of domestic and overseas volcanic exploration, the low frequency excitation and receiving, and survey with wide range, high coverage, wide azimuth should be paid more attention, associated with two-dimensional and three-dimensional wave equation forward modeling and real data processing contrast analysis method. The image of underlying strata and fault are remarkably improved in the new method, according to the processing results of new seismic data. The new method will provide technical reference for the similar volcanic development area in the future seismic acquisition design.

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Section: Observation Azimuthmentioning

confidence: 99%

3D Seismic Acquisition Technology and Effect in HX Volcanic Area in Liaohe Depression

Wang¹,

Liu²,

Zou³

et al. 2016

IJG

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“…It is true that the spatial density of the point scatterers could be made large enough to model any complex structure, but no matter how fine the scattering-elements grid is, the isotropic nature of the scattered radiation could cause the design algorithm to suggest receiver locations where no radiation is forecast. This is, for instance, the case for most subsalt reservoirs, which are characterized by steep dipping interfaces on which scattering radiation is typically anisotropic which seriously complicates formation imaging and data acquisition (Xiao et al, 2013;Baldock et al, 2012;Zhuo and Ting, 2011;Moldoveanu and Kapoor, 2009;Howard, 2007;Howard and Moldoveanu, 2012;Michell et al, 2006;Farmer et al, 1996). Recently, we have considered such deep-water field from offshore Gulf of Mexico from the standpoint of Bayesian OED.…”

Section: Introductionmentioning

confidence: 99%

Accounting for seismic radiation anisotropy in Bayesian survey designs

2016

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The seismic radiation patterns associated with probing the earth's subsurface are essentially anisotropic due to its ubiquitous stratified structure. This anisotropy seriously complicates formation imaging and data acquisition. This is most salient for deep-water subsalt reservoirs. Traditionally, point scatterers with isotropic radiation patterns are used in migration imaging, but in the survey design problem, these might lead to design errors caused by receivers being placed in poor locations with respect to the radiation pattern of the scattering structure. Here, we extend a framework which accounts for anisotropy in the scattered radiation for optimal geophysical survey design purposes. The propagation medium is assumed to be attenuative. The locally dipping interfaces are modeled as a discrete set of finite-size planar scattering elements. The general elastodynamic expressions for the sensitivity kernels, i.e., the vectors which mathematically represent the candidate observations, in the presence of the scattering elements are provided. The size of each element controls the width of its radiation pattern, which may in turn be used to characterize the uncertainty on the dip angle, thus complementing the information provided by the model-parameter uncertainties and ultimately leading to better geophysical survey designs.

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