Method of using extremely low frequency marine electromagnetic method to conduct marine oil and gas resources exploration

Abstract

The invention provides a method of using extremely low frequency marine electromagnetic method to conduct marine oil and gas resources exploration. The method of using the extremely low frequency marine electromagnetic method to conduct the marine oil and gas resources exploration includes building an extremely low frequency launcher and a transmitting antenna, arranging a seafloor data collection station in a decided detected sea area, receiving signals of extremely low frequency electromagnetic signals after being reflected by seafloor mediums by using a seafloor electromagnetic signal collection station, figuring apparent resistivity and phases of the seafloor mediums according to the received electromagnetic signals, and getting construction conditions of seafloor oil and gas resources through inversion and geological interpretation. Compared with the marine magnetotelluric method, the method of using the extremely low frequency marine electromagnetic method to conduct the marine oil and gas resources exploration is high in measuring accuracy of electromagnetic signals and improves exploration accuracy. Compared with an existing marine artificial source electromagnetic method, the method of using the extremely low frequency marine electromagnetic method to conduct the marine oil and gas resources exploration saves a built-in emission source and reduces construction difficulties and saves construction cost. The method of using the extremely low frequency marine electromagnetic method to conduct the marine oil and gas resources exploration is an exploration method which combines advantages of the marine magnetotelluric method and advantages of the marine artificial source electromagnetic method.

Description

Technical field [0001] The invention relates to a method for exploring marine oil and gas resources by using an extremely low-frequency marine electromagnetic method, in particular a method for using an artificial source marine electromagnetic method, and belongs to the technical field of marine resource exploration. Background technique [0002] Marine geophysical exploration has always been dominated by earthquakes, supplemented by gravity and magnetism. For a long time, people have believed that high conductivity seawater will hinder the application of electromagnetic exploration, so little attention has been paid to the possibility of electromagnetic methods in marine environments. However, with the progress of marine geological surveys, it is found that marine seismic exploration is very difficult in areas covered by volcanic rocks, carbonate rocks, coral reefs, and mud diapirs, and it is urgent to find other effective geophysical methods to cooperate. In contrast, elec...

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Problems solved by technology

②In the stage of shallow water test exploration, in order to obtain marine electromagnetic data, tests were carried out in shallow waters in the early 1980s. Due to the limitations of instruments and equipment and ocean detection technology at that time, the test was not successful

The marine magnetotelluric method has the shortcomings of weak anti-interference ability and low detection accuracy due to the large randomness and weak signal of atmospheric noise; while the existing marine artificial source electromagnetic method uses artificially emitted high signal-to-noise ratio signals instead of natural field signals. The anti-interference ability and detection accuracy have been improved, but there are shortcomings such as high cost, difficult construction, and small detection range. A new type of marine electromagnetic detection method is urgently needed to solve the above problems

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