Environmental and Exploration Geophysics II

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Environmental and Exploration Geophysics II
Pitfalls in Seismic Interpretation (Part 2)
more work on your term projects
tom.h.wilson tom.wilson_at_mail.wvu.edu
Department of Geology and Geography West Virginia
University Morgantown, WV
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Static anomalies
Tucker and Yorston
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Tucker and Yorston
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Flat Reflector
Apparent structural features are related to
variations in thickness of near-surface
low-velocity weathered layer.
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Apparent low in the time structure
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Low to southwest also observed in pre-stack depth
converted seismic
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Note that the lows tend to be concentrated in the
valleys
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We actually have a structural high in this area
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Note that the lows tend to be concentrated in the
valleys
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Tucker and Yorston
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Tucker and Yorston
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Velocity usually increases with Depth
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A Velocity Pitfall?
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Tucker and Yorston
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Erosional Truncation?
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To Do

• Read through pages 229 to 232 (static
  corrections) and look over problem 4.14
• Look over the velocity analysis pitfalls
  exercise handed out today
• Bring questions to class on Monday