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SEISMIC STRATIGRAPHY

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04-02-2022 Geophysics 1

Why do Seismic stratigraphy?

  • Geological age correlations
  • Thickness estimates
  • Environment of deposition
  • Paleo bathymetry
  • Burial history
  • Relief
  • Topography on unconformities
  • Lithology
  • Porosity/permeability
  • Fluid content
  • Insight into source and seal
There are three scales for seismic stratigraphy studies:
  • Regional Scale Seismic Strat Interpretation (Large scale stratigraphic interpretation of data “seismic stratigraphy”).
  • Prospect Scale Seismic Strat interpretation. Localized interpretation to define a prospect. May include the use of reflection configurations, wave shape, amplitude, etc.
  • Reservoir scale Seismic Strat interpretation. Quantitatively characterize reservoir (net sand, phi
  • H, etc.) to permit reserve determination, reservoir simulation, etc…
Seismic stratigraphy is divided into two main categories:
  • Reflection character analysis
  • Seismic facies analysis
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A. Reflection character analysis

Analyze the lateral variation of an individual reflection unit (or units) to localize where stratigraphic changes are found and identify their nature.

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Reflector terminations defining the upper and lower boundary of sequences

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Reflector terminations defining the upper and lower boundary of seismic sequences

B. Seismic facies analysis
  • Estimating deposition environment using the character of the seismic reflections.
  • Understand depositional history.
  • Locate and predict potential hydrocarbon reservoir and stratigraphic traps.
Seismic facies

It is the group of reflections bounded by top and base boundaries.

Seismic parameters used for facies detection are
  • Reflection configuration
  • Reflection amplitude
  • Frequency
  • Continuity
  • Interval velocity

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