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Joint PP-PS Inversion

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

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.

Quantitative Analysis of Seismic Uncertainty

Earth model uncertainty assessment

Reduce event uncertainty in oil and gas reservoirs with quantitative analysis.

Directional Designature

Calibrated seismic signatures for every emergent angle

Create a common signature for every emergent angle for each recorded source.

Multicomponent Interpretation and Event Registration

Techniques for understanding similarities and differences between PP and PS data

Fully maximize multicomponent data by combining the results and interpretations from both conventional and shear or converted wave.

AVO Seismic Inversion

Quantitative reservoir description and characterization

Derive acoustic and elastic impedance through inversion of seismic traces.

Anisotropic PS Kirchhoff PSTM and PSDM

Superior mode-converted imaging in time or depth

Discover industry-leading workflows for converted-wave velocity model parameterization and imaging in time or depth.

Shallow Geohazard Assessment

Predrill shallow geohazard delineation

Identify, map, and delineate seafloor, shallow subsurface geologic, and constructed features.