OHM Secures Survey Vessel for Three-Continent Program

Offshore Hydrocarbon Mapping plc (OHM) said that it has chartered a survey vessel for a five-month Controlled Source Electromagnetic (CSEM) survey program in Northwest Europe, West Africa and the Falkland Islands.

The 81-meter CS Teneo has been chartered from marine services company Tyco Telecommunications to provide a support platform for a number of CSEM surveys. The CS Teneo is currently being prepared for the OHM survey work.

"We need a vessel that can not only provide a platform for equipment deployment and recovery operations, but also that is able to meet the demands and tight schedule of multiple client projects across three continents." comments Dave Pratt, OHM's CEO. "OHM has been working with Tyco in the North Sea and it was a logical choice to extend our work with them to other CSEM survey locations around the world."

The Spanish-registered CS Teneo, a highly versatile 81-meter vessel, forms part of a fleet of specialized vessels and sub-sea equipment owned and operated by Tyco Telecommunications which also includes six 140m Reliance Class vessels.

"The CS Teneo has a long track record of effective and economic operations over a range of offshore projects. She is well suited to shelf operations and has been working in the Mediterranean, Caribbean and North European regions for the past year," adds Mark Wickham, director for global sales, marine services, Tyco Telecommunications.

Controlled Source Electro-Magnetic imaging (CSEM) is potentially the most important new technology in the field of offshore oil & gas exploration since the advent of 3D seismic some twenty years ago. CSEM is an innovative offshore geophysical technique, employing electromagnetic remote-sensing technology to detect the presence and extent of hydrocarbon accumulations below the seabed. The CSEM survey uses a dipole source that is towed just above the seafloor to transmit an electromagnetic field into the earth. 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. CSEM imaging can significantly reduce the risk of drilling dry exploration wells creating considerable value for oil & gas explorers.

The technique was first used offshore Angola in 2000 and has since become a key deepwater exploration tool for the major oil companies. Very high success rates have been quoted by these companies, particularly when the results of a CSEM survey have been integrated with seismic interpretation.

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