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Joint PP-PS Inversion

Flexible joint inversion scheme for improving confidence from shear-wave data

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New information and improved confidence from shear-wave data

A flexible joint inversion scheme enables a range of P-wave and S-wave data to be combined for different inversion goals. Analyzing the results from independent datasets provides additional value and reduces risk and uncertainty. For example, joint PP-PS inversion

  • helps determine fracture density and orientation
  • provides fluid and lithology discrimination and characterization
  • enables seismic classification of PP-PS attributes
  • identifies drilling hazards, including overpressure, shallow gas, and rock strength.

Independent poststack inversion can be used as a detailed check of the event correlation or as a deliverable. PS data can be inverted directly or after transformation to S reflectivity. For wide-azimuth geometries, the AVO attributes can be analyzed for azimuthal variation. An additional refinement of standard shear-wave splitting inversion can be used to show the direction and degree of tilt in tilted fracture sets.

Schlumberger offers a range of AVO and inversion technologies for conventional P-wave and joint PP-PS datasets.

Joint PP-PS inversion using borehole-calibrated multicomponent data.
Joint inversion of PP and PS data: Borehole-calibrated PP and PS angle gathers (from left to right, panels one and two) are input to a joint AVO inversion to derive P and S impedance contrasts, plus density (panels three, four, and five) and with uncertainty bounds for all three. The final, forward-modeled PP and PS angle gathers (panels six and seven) close the loop and are compared with the input data.

AVO Seismic Inversion

Quantitative reservoir description and characterization

Derive acoustic and elastic impedance through inversion of seismic traces.

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