The DHI Window
The DHI Window tuning schematic showing top reservoir interface amplitude variation with depth below mudline

The DHI Window

Jon ffrench Jon ffrench

Jon ffrench

Expert Petrel Seismic Interpretation Geophysicist

发布日期: 2020年1月7日
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  • The DHI Window is defined as the depth range below mudline that DHI characteristics are observable on seismic data. This is variable but is typically between 0-4000m below mudline
  • DHI characteristics are strongest at shallow depths and they decrease in strength with increased depth. This is partly due to change in rock properties/compressibility but also due to a decreased frequency range and reduced signal/noise ratio
  • The above diagram illustrates how reflectivity strength and DHI characteristics of the top reservoir interface change with increased depth below mudline
  • The adjacent tuning rings in particular decrease in strength with increased depth
  • At some point with increased depth, tuning rings can be the only clearly observable DHI characteristic defining the overall DHI anomaly
  • As the diagram shows destructive intersection tuning rings can be hard i.e. have a polarity flip from negative to positive impedance

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