Technical Paper: Inversion of Marine Controlled Source Electromagnetic Data Using a “Structure”-Based Approach

Society: SBGF
Paper Number: 2588
Presentation Date: 2011


We present a fast “structure”-based inversion workflow for interpreting marine Controlled Source Electromagnetic (mCSEM) data, which reconstructs the resistivities and shapes of regions of interest using an inversion algorithm where the model is parameterized using both open and closed “structures”. These a priori information may come from independent measurements (e.g., seismic) or from the results of an image-based inversion workflow.

We show that the “structure”-based inversion is capable of quantitatively reconstruct the resistivities and shapes of the regions of interest such as prospective reservoirs to obtain models that are consistent with both the mCSEM and the seismic data and that considerable improvement in resolution is achieved compared to the current state-of-the-art.

We illustrate the advantages and drawbacks of the “structure” inversion using both synthetic and real data acquired in the Santos Basin, offshore Brazil.

Technical Paper presented at the 12th International Congress of the Brazilian Geophysical Society, held in Rio de Janeiro, Brazil, August 15-18, 2011.

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