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摘要
There are some problems when using the deep tow Marine Controlled Source Electromagnetic (MCSEM) transmitter system to detect some shallow resources like gas hydrate. For example, the transmitter electrodes could not be towed along the seafloor, which will lead to the electromagnetic attenuation of the seawater layer, so the relatively high-frequency over 10 Hz cannot be transmitted beneath the seafloor. The number of data in the time window is limited in the towing process. The towing route may be parallel with the strike of the submarine structure. A new type of deployed MCSEM transmitter system probably could solve the above problems. The deployed transmitter system includes on-board power supply and monitoring control unit, long distance electrical power and data transformation unit, and underwater transmitter main body. The deployed transmitter electrodes are close to the bottom of the seafloor, which is a benefit for the relatively high-frequency long distance transmission below the seafloor. The location and the transmission direction are easy to confirm by using the ultra-short baseline beacon and Attitude and Heading Reference System, respectively. The signal to noise ratio could be promoted by adding the transmitting time in one site: The abnormal target can be detected in two orthogonal directions by using the transmitter electrodes. The test result in 2015 showed that the deployed transmitter and deep tow transmitter can be used jointly to excite the beneath seafloor abnormal body in a wide band and different directions and provide more useful source information for the receivers.
- 出版日期2017-11
- 单位广州海洋地质调查局; 中国地质大学（北京）
