Our 4D inversion toolkit, formulated in the framework of TGS' Dynamic Matching FWI (DM FWI) workflow, offers a cost-effective solution while producing coherent and detailed time-lapse velocity model responses for fluid dynamics and reservoir monitoring.

 

 

 

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Legacy Velocity
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DM FWI Updated Velocity

Adding Value to 4D Workflows

TGS' DM FWI can significantly optimize traditional 4D processing workflows by reducing project turnaround times. As an iterative least-squares solution of the full wavefield, FWI utilizes both primaries and multiples, leading to cleaner products and accurate differences. This improved efficiency allows for 4D FWI products to be delivered much faster, sometimes within weeks of acquisition completion.

4D DM FWI for Towed Streamer

4D DM FWI produces anomalies in coincident locations as difference features on conventionally derived reflectivity images. Despite the progress made, there are still very few published examples of using FWI imaging in 4D. In this case study TGS shows the application of such technology to a towed streamer data example offshore Nigeria.

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RTM stack with 4D DM FWI velocity difference

4D DM FWI for OBN

DM FWI has several potential advantages over conventional imaging. It is an iterative least squares solution of the full wavefield and thus has the ability to provide cleaner attributes as a result of the least squares nature of the process. This case study presents the application of  various implementations of 4D DM FWI to a shallow water dense OBN survey from the North Sea.

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