Tomography Version 1.0 Features

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Tomography - Version 1.0Features Discussion

• Dan Herold
• Parallel Geoscience Corporation

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jelly Data management

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john Model building and ray-tracing
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jeronimo Analyze tomo results
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Proposed TomoInv Architecture
Jelly
Data management
-seismic -velocity -picks
John
Modeling
-surfaces -signatures
Inversion
Jerry
-velocities -residuals -histograms
Jeronimo
Display
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Proposed TomoInv Architecture
Data management
-seismic -velocity -picks
John
Modeling
-surfaces -signatures
Inversion
Jerry
-velocities -residuals -histograms
Display
java
Proposed interface
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Define Project

• Input project name and description
• Select pre stack time seismic volume
• Select post stack time seismic volume
• Define extent of study area

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Post Stack Depth Interpretation

• Import depth interpretation from workstation
• Landmark
• GeoQuest
• SMT
• Others....
• Pick using integrated Parallel Geoscience
  application

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Select Analysis Locations

• Interactively select arbitrary grid of analysis
  locations

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Prestack migration and demigration

• Prestack migration of analysis locations
• Pick moveout and slope
• From these quantities, automated demigration
  (patent pending) for producing traveltimes for
  tomography

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Picking of depth gathers

• Use existing SeisViewer then customize as a
  new application with integrated QC tools
• load the guide at the beginning of depth gathers
• scan over parabolic functions for moveout
  estimation by coherency analysis
• once the best fit obtained, snap to the maximum
  energy peak
• then automatic (?,p) analysis for estimating the
  local dip of surface element

• Save depth picks, run automated demigration,
  result saved in format for traveltime tomography

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Version 1.0 - Specifications

• 3D surface seismic surveys
• Blocky velocity models, with constant or
  laterally varying velocities per block, with
  fixed vertical velocity gradients per block
• Inversion of primary reflections
• Soft constraints a priori model input and
  L-curve implementation
• Picking in the depth domain, with 3D post and
  pre stack integrated migration-demigration
  approach
• horizon picking on 3D post stack volume and
  import capability
• moveout and dip picking for selected depth
  gathers
• Integration of john's facilities and jeronimo's
  views

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Options for version 2

• Strong constraints on model (well control points)
• V(x,y,z) velocity variations inside blocks
• Joint inversion of direct arrivals and reflection
  times
• Anisotropic layers (TI)
• Converted waves
• Non surface seismic surveys (OBC and VSP)