View in EDS

Common-reflection-surface imaging of shallow and ultrashallow reflectors.

Saved in:
Bibliographic Details
Title: Common-reflection-surface imaging of shallow and ultrashallow reflectors.
Authors: Deidda, Gian Piero1 gpdeidda@unica.it, Battaglia, Enzo1 ebattaglia@unica.it, Heilmann, Zeno2 zeno@crs4.it
Source: Geophysics. Jul/Aug2012, Vol. 77 Issue 4, pB177-B185. 9p.
Subjects: Seismic reflection method data processing, Lighting reflectors, Seismic prospecting, Geophysical prospecting, Seismometry
Abstract: We analyzed the feasibility of the common-reflection-surface (CRS) stack for near-surface surveys as an alternative to the conventional common midpoint (CMP) stacking procedure. The data-driven, less user-interactive CRS method could be more cost efficient for shallow surveys, where the high sensitivity to velocity analysis makes data processing a critical step. We compared the results for two field data sets collected to image shallow and ultrashallow reflectors: an example of shallow P-wave reflection for targets in the first few hundred meters, and an example of SH-wave reflection for targets in the first 10 m. By processing the shallow P-wave records using the CMP method, we imaged several nearly horizontal reflectors with onsets from 60 to about 250 ms. The CRS stack produced a stacked section more suited for a subsurface interpretation, without any preliminary formal and time-consuming velocity analysis, because the imaged reflectors possessed greater coherency and lateral continuity. With CMP processing of the SH-wave records, we imaged a dipping bedrock interface below four horizontal reflectors in unconsolidated, very low velocity sediments. The vertical and lateral resolution was very high, despite the very shallow depth: the image showed the pinchout of two layers at less than 10 m depth. The numerous traces used by the CRS stack improved the continuity of the shallowest reflector, but the deepest overburden reflectors appear unresolved, with not well-imaged pinchouts. Using the kinematic wavefield attributes determined for each stacking operation, we retrieved velocity fields fitting the stacking velocities we had estimated in the CMP processing. The use of CRS stack could be a significant step ahead to increase the acceptance of the seismic reflection method as a routine investigation method in shallow and ultrashallow seismics. [ABSTRACT FROM AUTHOR]
Copyright of Geophysics is the property of Society of Exploration Geophysicists and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
Database: Engineering Source
FullText Text:
  Availability: 0
Header DbId: egs
DbLabel: Engineering Source
An: 79568750
AccessLevel: 6
PubType: Academic Journal
PubTypeId: academicJournal
PreciseRelevancyScore: 0
IllustrationInfo
Items – Name: Title
  Label: Title
  Group: Ti
  Data: Common-reflection-surface imaging of shallow and ultrashallow reflectors.
– Name: Author
  Label: Authors
  Group: Au
  Data: <searchLink fieldCode="AR" term="%22Deidda%2C+Gian+Piero%22">Deidda, Gian Piero</searchLink><relatesTo>1</relatesTo><i> gpdeidda@unica.it</i><br /><searchLink fieldCode="AR" term="%22Battaglia%2C+Enzo%22">Battaglia, Enzo</searchLink><relatesTo>1</relatesTo><i> ebattaglia@unica.it</i><br /><searchLink fieldCode="AR" term="%22Heilmann%2C+Zeno%22">Heilmann, Zeno</searchLink><relatesTo>2</relatesTo><i> zeno@crs4.it</i>
– Name: TitleSource
  Label: Source
  Group: Src
  Data: <searchLink fieldCode="JN" term="%22Geophysics%22">Geophysics</searchLink>. Jul/Aug2012, Vol. 77 Issue 4, pB177-B185. 9p.
– Name: Subject
  Label: Subjects
  Group: Su
  Data: <searchLink fieldCode="DE" term="%22Seismic+reflection+method+data+processing%22">Seismic reflection method data processing</searchLink><br /><searchLink fieldCode="DE" term="%22Lighting+reflectors%22">Lighting reflectors</searchLink><br /><searchLink fieldCode="DE" term="%22Seismic+prospecting%22">Seismic prospecting</searchLink><br /><searchLink fieldCode="DE" term="%22Geophysical+prospecting%22">Geophysical prospecting</searchLink><br /><searchLink fieldCode="DE" term="%22Seismometry%22">Seismometry</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: We analyzed the feasibility of the common-reflection-surface (CRS) stack for near-surface surveys as an alternative to the conventional common midpoint (CMP) stacking procedure. The data-driven, less user-interactive CRS method could be more cost efficient for shallow surveys, where the high sensitivity to velocity analysis makes data processing a critical step. We compared the results for two field data sets collected to image shallow and ultrashallow reflectors: an example of shallow P-wave reflection for targets in the first few hundred meters, and an example of SH-wave reflection for targets in the first 10 m. By processing the shallow P-wave records using the CMP method, we imaged several nearly horizontal reflectors with onsets from 60 to about 250 ms. The CRS stack produced a stacked section more suited for a subsurface interpretation, without any preliminary formal and time-consuming velocity analysis, because the imaged reflectors possessed greater coherency and lateral continuity. With CMP processing of the SH-wave records, we imaged a dipping bedrock interface below four horizontal reflectors in unconsolidated, very low velocity sediments. The vertical and lateral resolution was very high, despite the very shallow depth: the image showed the pinchout of two layers at less than 10 m depth. The numerous traces used by the CRS stack improved the continuity of the shallowest reflector, but the deepest overburden reflectors appear unresolved, with not well-imaged pinchouts. Using the kinematic wavefield attributes determined for each stacking operation, we retrieved velocity fields fitting the stacking velocities we had estimated in the CMP processing. The use of CRS stack could be a significant step ahead to increase the acceptance of the seismic reflection method as a routine investigation method in shallow and ultrashallow seismics. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Geophysics is the property of Society of Exploration Geophysicists and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
PLink https://search.ebscohost.com/login.aspx?direct=true&site=eds-live&db=egs&AN=79568750
RecordInfo BibRecord:
  BibEntity:
    Identifiers:
      – Type: doi
        Value: 10.1190/GEO2011-0401.1
    Languages:
      – Code: eng
        Text: English
    PhysicalDescription:
      Pagination:
        PageCount: 9
        StartPage: B177
    Subjects:
      – SubjectFull: Seismic reflection method data processing
        Type: general
      – SubjectFull: Lighting reflectors
        Type: general
      – SubjectFull: Seismic prospecting
        Type: general
      – SubjectFull: Geophysical prospecting
        Type: general
      – SubjectFull: Seismometry
        Type: general
    Titles:
      – TitleFull: Common-reflection-surface imaging of shallow and ultrashallow reflectors.
        Type: main
  BibRelationships:
    HasContributorRelationships:
      – PersonEntity:
          Name:
            NameFull: Deidda, Gian Piero
      – PersonEntity:
          Name:
            NameFull: Battaglia, Enzo
      – PersonEntity:
          Name:
            NameFull: Heilmann, Zeno
    IsPartOfRelationships:
      – BibEntity:
          Dates:
            – D: 01
              M: 07
              Text: Jul/Aug2012
              Type: published
              Y: 2012
          Identifiers:
            – Type: issn-print
              Value: 00168033
          Numbering:
            – Type: volume
              Value: 77
            – Type: issue
              Value: 4
          Titles:
            – TitleFull: Geophysics
              Type: main
ResultId 1