Development Of Deck Monitoring Software For Marine Controllable Source Electromagnetic Transmitters

The marine controlled source electromagnetic prospecting technology based on Marine Controlled Source Electromagnetic Method(MCSEM)has become one of the important methods in offshore oil and gas exploration.In the marine controlled source electromagnetic survey,a high-power electromagnetic transmitter carrying a transmitting electrode is generally used as a field source,and a low-frequency square-wave current is transmitted through a transmitter's transmitting electrode,seawater,and the seabed to form a closed loop,and an electromagnetic field is generated around it.The electromagnetic field signal is collected by the receiver.After the data in the receiver and the transmitter are processed and inversely calculated,the conductive structure of the medium below the seabed can be known.The marine controlled source electromagnetic transmitter is the main instrument in the marine controlled source electromagnetic prospecting technology.In the process of sea trial operation,the marine controlled source electromagnetic transmitter was developed based on the theory of marine controlled source electromagnetic method.With the monitoring unit on the deck,the instrument operator can establish remote data communication between the onboard computer and the submarine transmitter,so as to realize real-time monitoring and control of the operational status and attitude of the subsea transmitter during the operation of the instrument.In this paper,based on the 127 national special project,gas hydrate resources exploration and test production engineering,combined with fiber-to-serial communication technology,the research and development of the upper computer technology in the monitoring unit of the deck-side electromagnetic transmitter suitable for marine controlled source electromagnetic transmitters is carried out.It is an important part of the high-power ocean controllable source electromagnetic emission system.In this project,the deck monitoring unit consists of two parts: hardware and software.The hardware consists of the communication module of the electromagnetic transmitter of the marine controllable source,the optical fiber in the deep streamer,the control computer at the deck,and the optical transceiver of the fiber to serial port.The software uses C#'s high-level programming language to design and implement a data exchange platform based on a fiber-to-serial communication using the Windows Forms application program.Based on the experience of previous generations,the power management,current acquisition,and Multiple modules such as the master control module,altimeter,and attitude azimuth are used to develop and monitor the upper deck monitoring program on the deck.