Schlumberger

Technical Paper: Enhancing the Resolution of mCSEM Using a Hybrid-based Inversion Workflow

Society: EAGE
Paper Number: C026
Presentation Date: 2011
 

Abstract

We present a fast “hybrid”-based inversion workflow for interpreting mCSEM data, which reconstructs the resistivities and shapes of regions of interest using an image-based inversion approach followed by a “structure”-based 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 the image-based inversion.

We show that the “hybrid”-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 “hybrid” inversion using both synthetic and real data. The real data were acquired in the Santos Basin offshore Brazil as part of a co-operation project between Petrobras and Schlumberger to evaluate the technique’s strengths and limitations when applied to the Brazilian deep offshore and to bring new insights toward the development of novel and cost effective solutions and establishment of new interpretation technology.

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