Technical Paper: 3D Inversion of Total Field mCSEM Data: The Santos Basin Case Study

Society: SEG
Paper Number: 2010-629-633
Presentation Date: 2010

We present a marine Controlled Source Electromagnetic (mCSEM) 3D interpretation workflow based on anisotropic inversion applied to a dataset acquired in the Santos Basin offshore Brazil as part of a co-operation project between Petrobras and Schlumberger to evaluate the integration of deep reading Electromagnetic (EM) technologies into the full cycle of oil field exploration and development.

The mCSEM dataset was acquired to demonstrate the improved detection and delineation of challenging EMtargets such as “smaller and deeper” hydrocarbon filled reservoir zones in complex background using 3D total field data. The project area hosting a proven reservoir was covered by a receiver grid and an orthogonal source lines grid extending beyond the receivers in the in line and cross line directions with all receivers active throughout the acquisition of both the orthogonal sets of source lines.

We show that 3D inversion of the mCSEM total field data embedded in an advanced integrated workflow improves our ability to delineate hydrocarbon, their position and thickness resolution and increases our confidence about the resistivity at the reservoir(s) level. This increased resolution can provide in subsequent integrated interpretation workflows detailed information about reservoir volume distributions.

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