Electromagnetic Seabed Logging (eBook)

Stéphane Sainson obtained his Ph.D. degree in geophysics in 1984 (Applied Geophysics Laboratory of the Ecole Normale Supérieure de Paris). After working several years as a diver and as a prospector, Dr. Sainson subsequently held the positions of research engineer in wireline logging, project leader in borehole seismic (Schlumberger) and finally R & D manager for special offshore operations on pipelines (Challenger of Vinci group). S. Sainson exercises his independent consulting engineering profession since 1997.

Introduction.- Preamble.- Economic environment.- Elements of geology and oil exploration.- Electrical resistivity and geology.- The electromagnetic seabed logging (SBL): its place in the modern petroleum exploration.- Historic landmarks on the sea bottom SBL.- SBL methods philosophies and interests.- SBL industry and environmental impact.- Overview of the book.- Principles and methods.- Introduction.- Physical laws and principles.- Different methods and associated devices.- Operational limitations: detection problems.- Advantages and disadvantages compared to the seismic investigations.- Hybrid and combined methods.- Conclusion and synthesis.- Metrology and sea environment.- Introduction.- Electromagnetic properties of propagation media.- Frequential and temporal aspects of the method.- Theoretical evaluation and measurement of EM fields.- Acquisition systems definition and operational procedures.- Conclusion.- Instrumentation and equipment.- Introduction.- Measuring instruments qualities.- History of measuring equipments.- The transmitter.- The receivers.- Operational capabilities.- Conclusion.- Interpretation and modeling.- Introduction.- Reminders and general methods of interpretation.- Analytical models.- Numerical models.- Inversion techniques.-Analog models.- Conclusion.- Geological applications.- Introduction.- North Atlantic: Ramesses III (oceanic ridge).- West Africa: Angola basin (oil).- North Sea: Troll field (gas).- North Sea: Frigg field (gas pipelines).- Barents Sea: basin Nordkapp (diapir).- Malaysian gisement monitoring.- Example of DC prospecting.- Conclusion.- Overall conclusion and perspectives.