A deepwater Gulf of Mexico subsalt imaging analysis with finite‐difference modeling

Cogan, Mike; Gardner, Jason; Moldoveanu, Nick

doi:10.1190/1.3627867

Cited by 2 publications

(1 citation statement)

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“…Workflows for the study of complex regions often require modeling specific acquisition geometries and imaging with costly wave-based algorithms (Cogan et al, 2011). For target-oriented studies wave-equation illumination maps can be more efficiently obtained from decomposition into local dip and azimuth of modeled synthetic seismograms generated by point sources located at the target and propagated upwards through the earth model using an accurate wave propagation method.…”

Section: Methodsmentioning

confidence: 99%

Finite difference wave-equation illumination: a deep-water case study

Gardner¹,

Lapilli²,

Xu³

et al. 2012

SEG Technical Program Expanded Abstracts 2012

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Illumination studies of targets in complex geologies is a central aspect in survey design, structural imaging and reservoir characterization, and require more accurate algorithms that properly describe the physical properties of wave propagation. Conventionally, illumination and resolution studies for survey design involve ray-based methods, and although they capture properly properties of simpler earth models, they suffer from severe limitations in accuracy in complex regions. Earlier work (Lapilli et al., 2010) introduced a method for target-oriented illumination studies where wave propagation accurately models the wavefield properties, and target-oriented illumination maps are constructed through local decomposition of synthetic seismograms. This target-oriented method presents a reduced modeling cost when compared to an illumination study where given acquisition geometries are fully modeled and migrated to obtain the imaged amplitudes at a selected target. This work presents results of a target-oriented wave illumination study constructed for presurvey analysis of a full azimuth acquisition geometry over a deep-water subsalt target. The resulting illumination map is compared with the predicted illumination maps of both a fully synthesized and depth migrated target amplitude map and ray-based amplitude map. Shot weights describing the contribution of energy to imaging a given target are also computed, results demonstrate these weights are more stable and adequate for amplitude studies as compared to ray-based results.

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Section: Methodsmentioning

confidence: 99%

Finite difference wave-equation illumination: a deep-water case study

Gardner¹,

Lapilli²,

Xu³

et al. 2012

SEG Technical Program Expanded Abstracts 2012

Self Cite

View full text Add to dashboard Cite

show abstract

The Effects of Marine Data Acquisition Practices on Imaging in Complex Geological Setting - Modeling Study

Cvetković¹,

Farmer²,

Bloor³

2013

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

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Interpreting seismic images in complex geological settings still remains a challenging task. Poor illumination, poor signal-to-noise ratio and high level of uncertainty are some of the imaging issues in complex marine environments such as subsalt Gulf of Mexico and West Africa, sub-basalt and pre-salt offshore Brazil and others (Howard et al., 2007; Ver West et al., 2007). Billet et al. (2010) point out that seismic technology evolution going beyond WAZ geometries needs further progress on both the acquisition and processing fronts. In this abstract we present results of a modeling exercise and show the effects that survey design choices have on the final image beneath the salt. We change individual acquisition parameters and observing the impact on the image as well as consequences of processing and velocity model building. Besides qualitative notions on what survey design choices have most influence we are also assessing steps needed towards quantifying the uncertainty.

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A deepwater Gulf of Mexico subsalt imaging analysis with finite‐difference modeling

Cited by 2 publications

References 4 publications

Finite difference wave-equation illumination: a deep-water case study

Finite difference wave-equation illumination: a deep-water case study

The Effects of Marine Data Acquisition Practices on Imaging in Complex Geological Setting - Modeling Study

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