More information is available in the agenda.

Lecturers: Rune Mittet and Ståle Johansen

Introduction

• Application areas for marine CSEM and marine MT.
• Survey layout.
• Transmitter and receiver equipment.

Theory

• Skindepth and dispersion effects
• Radiation pattern from a horizontal electric dipole transmitter.
• Transmitter waveform design.
• Propagation modes in marine CSEM – reflections versus refractions.

Data visualization

• Amplitude and phase as a function of transmitter-receiver offset.
• The effects of high/low resistivity on amplitude (and phase) versus offset.
• Normalized plots.

Data uncertainty

• Data weights for inversion.
• Maximum depth of imaging.

Marine CSEM in shallow water

Decomposition in upgoing and downgoing fields

• Effect on data.
• Inversion of upgoing electric fields.

Anisotropy

Environmental effects of marine CSEM

Lecturer: Ståle Johansen

Interpretation of CSEM data

• Introduction to interpretation of CSEM data
• Basic interpretation concepts
• CSEM work flow
• Sensitivity study and survey design
• Inversion
• Practical interpretation and integration of CSEM data
• Anisotropy in interpretation
• Troll case study
• Gulf of Mexico case study
• Barents Sea case study
• West of Shetland case study
• Implications for HC play- and prospect evaluation

Learning outcome

The participants will get a basic understanding of the CSEM experiment and the underlying physics. They will understand the fundamental processing sequence from raw data to inverted resistivity cubes. They will get an introduction to interpretation of CSEM data and to integration of the results with seismic data, and also how to use the data in the exploration process.

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