Sea Bed Logging Technology –
A First Experience for the Philippines
Logging (SBL), or Controlled Source Electro-Magnetic surveying is a
remote-sensing technique that detects resistivity variations in the
subsurface. The technique involves a towed electromagnetic source
that emits low-frequency, continuous EM signals into the seawater
and the subsurface. An array of receivers deployed at the seabed
records the returning signal. Depending on the contrasts, such
highly resistive bodies can be identified and associated with the
presence of hydrocarbons.
technology is relatively new having been introduced less than five
years ago, SBL is fast gaining acceptance in the petroleum
exploration industry. The technology has attracted interest from
major oil companies worldwide and has been increasingly used as part
of their work programs to minimize uncertainties in finding oil and
Carigali Overseas Sdn Bhd, the operator of Service Contract 47 has
engaged the services of ElectroMagnetic GeoServices (EMGS), a
Norwegian company which developed the SBL technology, to carry out
the survey over two prospects, the Kamia and Molave, in June 2006.
This paper shares how this new oil and gas exploration tool was
applied, together with the knowledge learned and experiences gained
from the first ever SBL survey conducted in the Philippines.