Schlumberger

Multicomponent Interpretation and Event Registration

Understand similarities and differences between PP and PS data

One of the key stages in processing multicomponent seismic data is to combine the results and interpretations from both the conventional and the shear or converted wave. This facilitates interpretation of shallow high-resolution events, gives enhanced sub-gas and mud channel definition, and helps resolve amplitude anomalies with weak acoustic impedance contrasts.

In addition, the vertical Vp/Vs ratio or the vertical shear velocity can also be derived directly from the data, as well as shear impedance, or a more accurate density estimation from Joint PP-PS Inversion.

More detailed matching

Combining the different results requires event correlation or registration of the reflectivity, impedance, or some other convenient attribute for all major boundaries, or at least for a part of the reflection sequence around the target. Initial registration can be guided by physically meaningful interval values, and further attributes can be derived from these independent results to guide more detailed matching.

The correlation of P-wave and shear-wave results can be done exactly at a well location where depth and P and S velocity models are recorded, and where synthetic models can be matched to the seismic.

At other locations, or where no well data exists, a new automated 3D registration based on Non-rigid Matching offers a highly detailed registration or Vp/Vs ratios.

The techniques available include

  • manual event identification
  • fault registration
  • seismic cross-correlation coherency analysis
  • borehole calibration using Well-Driven Seismic
  • interactive QC of interval Vp/Vs.

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WesternGeco

Event Correlation Combines Results

Event registration using converted-wave Vp/Vs coherency analysis.
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