Controlled source electro-magnetic
The controlled source electromagnetic (CSEM) method is an offshore geophysical technique,[1][2] employing electromagnetic remote-sensing technology to indicate the presence and extent of hydrocarbon below the seabed, but often noise perturbs the delineation and quantification.[3]
The CSEM survey uses a dipole source that is towed just above the seafloor to transmit a time-varying electromagnetic field into the earth[4]. This field is modified by the presence of subsurface resistive layers and these changes are detected and logged by an array of receivers placed on the seabed. Because hydrocarbon-bearing formations are highly resistive compared with surrounding formations, a CSEM survey can indicate the presence of oil and gas in offshore situations.[5]
See also
- Exploration geophysics
- Electromagnetic Geoservices ASA
- WesternGeco
- List of oilfield service companies
References
- ^ Controlled Source Electromagnetic (CSEM) technique for detection and delineation of hydrocarbon reservoirs:
- ^ SIO Marine EM Laboratory
- ^ Bhatt, K. M. (2014), Microseisms and its impact on the marine‐controlled source electromagnetic signal, J. Geophys. Res. Solid Earth, 119, doi:10.1002/2014JB011024.
- ^ Stéphane Sainson, Electromagnetic seabed logging, A new tool for geoscientists. Ed. Springer, 2016
- ^ 2006 - mCSEM Marine Controlled Source Electromagnetic Archived 2008-12-04 at the Wayback Machine