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Marine EM survey technology and its new advances.

He Zhanxiang,Yu Gang.He Zhanxiang,BGP Inc,CNPC,Zhuozhou 072751,China  
Recently,marine Controlled Source ElectroMagnetic(CSEM)method and technology have been deployed as an aid to prioritizing previously identified targets,or making simple drill-or-not-drill decisions.It breaks through the treatment that traditional non-seismic method can only be used as an auxiliary exploration method in the early stage of oil and gas prospecting,and is unimportant or unnecessary.Why is that It is because marine CSEM technology can be used as the direct hydrocarbon indicator.In this paper,we reviewed the fundamental method of marine CSEM,and discussed the data acquisition,processing,and interpretation of marine CSEM,as well as the challenges and difficulties it faces today.We also introduced the new development progress of the marine CSEM technology around the world in recent years.
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