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4D Simultaneous Inversion

Quantitative approach to time-lapse data interpretation

Added insights

Independent wavelet estimations for each partial stack and each conventionally acquired survey. Because the wavelet estimations for the different seismic volumes are independent, any variations in amplitude and phase for the different seismic volumes will be captured by the wavelets.
Inversion directly for desired rock properties such as acoustic impedance, shear impedance, Poisson's ratio, V_p/V_s, and density as well as the corresponding changes in the desired rock properties. 4D-optimized simultaneous inversion directly inverts for the changes in rock properties, enabling you to directly implement prior models for the changes in rock properties.
Global optimization technique, where all partial stacks of all vintages of surveys and all samples within each partial stack are used at the same time through the inversion algorithm. Because all seismic volumes are simultaneously inverted, the 4D simultaneous inversion algorithm finds the model of the subsurface with rock properties and corresponding changes that optimally matches all partial stacks of all vintages of surveys.

Independent wavelet estimation combined with inversion directly for desired rock properties.

Red and yellow show an increase in acoustic impedance due to decreased pore pressure and increased water saturation (left) and an increase in Poisson's ratio due to increased water saturation (right). The increase in Poisson's ratio is confined to the initially oil-saturated zone.

Time-Lapse Seismic Processing QC

Specialized QC algorithms

Quickly identify issues and design corrections early in the processing flow.

Directional Designature

Calibrated seismic signatures for every emergent angle

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

Time-Lapse Seismic Processing Algorithms

Wavelet matching, spatial regularization, and survey matching

Reduce processing time and increase confidence with data customization.

Seismic Inversion Services

Inverse modeling techniques and specialist reservoir knowledge

Address acoustic and elastic inversion, rock physics analysis, and reservoir property modeling.

4D Survey Planning & Design

Presurvey evaluation to determine project parameters

Efficiently determine optimal 4D survey acquisition, processing, and inversion parameters.

Time-Lapse Seismic Processing

Monitor reservoir changes over time with high-quality repeatable seismic data

Proven approach to 4D processing with step-by-step removal of the effects of differing acquisition systems and unrepeated coverage using dedicated time-lapse algorithms.

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Case Study 3D Geomechanical Modeling Predicts Mud Weight to Maintain Wellbore in Oman Appraisal Wells

Cause of borehole breakouts in multiple zones determined, proper mud weights recommended.