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Geologically constrained seismic imaging; workflow

Stig-Kyrre Foss, Mark Rhodes, Bjorn Dalstrom, Christian Gram and Alastair Welbon
Geologically constrained seismic imaging; workflow (in Velocity estimation for depth imaging, William S. Harlan (editor), Robert T. Langan (editor) and Tamas Nemeth (editor))
Geophysics (September 2008) 73 (5, Suppl.): VE313-VE319

Abstract

We present the geologically constrained workflow for velocity-model building as a case study from offshore Brazil. The workflow involves basin reconstruction, gravity modeling, and seismic interpretation in addition to standard prestack depth migration (PSDM) model-building tools. Building a salt model based on seismic evidence can be highly nonunique. In a geologically constrained seismic-processing workflow, the main aim is to use geologic understanding with geophysical models and datasets to improve an input velocity realization for the PSDM loop, thereby improving image quality. All of these methods are inherently uncertain, and a final model is based on a range of subjective choices. Thus a final result that agrees with all sciences still can be completely wrong. However, an understanding of these choices enables a unique way of testing and constraining the number of antimodels: velocity models that fit the observations but are different from the final result. This can reduce time spent and uncertainty in geologic evaluation.


ISSN: 0016-8033
EISSN: 1942-2156
Coden: GPYSA7
Serial Title: Geophysics
Serial Volume: 73
Serial Issue: 5, Suppl.
Title: Geologically constrained seismic imaging; workflow
Title: Velocity estimation for depth imaging
Author(s): Foss, Stig-KyrreRhodes, MarkDalstrom, BjornGram, ChristianWelbon, Alastair
Author(s): Harlan, William S.editor
Author(s): Langan, Robert T.editor
Author(s): Nemeth, Tamaseditor
Affiliation: StatoilHydro, Oslo, Norway
Affiliation: Landmark Graphics, Highlands Ranch, CO, United States
Pages: VE313-VE319
Published: 200809
Text Language: English
Publisher: Society of Exploration Geophysicists, Tulsa, OK, United States
References: 16
Accession Number: 2009-085054
Categories: Applied geophysics
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus.
S34°00'00" - N05°15'00", W74°00'00" - W34°00'00"
Secondary Affiliation: Chevron, USA, United StatesBG Group, GBR, United Kingdom
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2018, American Geosciences Institute. Reference includes data supplied by Society of Exploration Geophysicists, Tulsa, OK, United States
Update Code: 200946
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