Schlumberger

Technical Paper: 1D, 2D and 3D Modeling and Inversion of 3D CSEM Data Offshore West Africa

Society: SEG
Paper Number:
Presentation Date: 2008
 

Discussed here are the results of a 1D and 3D forward with 1D and 2D inverse Controlled Source Electromagnetics (CSEM) modeling exercise over a know target offshore West Africa with the intent of demonstrating the technology, develop methodology for analysis and better understanding its limitations. The 3D dataset presented here is considered rich consisting of 11 transmitter (Tx) tow lines and 43 electric and magnetic seafloor receivers (Rx) arranged in a 3D grid pattern (see Figure 1) and acquired with a time-shared dual base frequency square waveform of 0.25 and 0.0625 Hz. Aspects of detectability, comparison to modeled results (1D, 2D and 3D), and resolution of known structure both horizontal and vertical, comparison with logged resistivities in a constrained and unconstrained sense are analyzed.

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