Vertical fault systems in the tectonosphere geoelectrical section in petroliferous domains of Sakhalin Island (Russia) and Gulf of Tonkin (Vietnam): Evidence from magnetotelluric sounding |
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| Authors: | V M Nikiforov G N Shkabarnya A Yu Zhukovin V B Kaplun N A Palshin I M Varentsov Do Huy Cuong Phung Van Phach Hoang Van Vuong S S Starzhinsky |
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| Institution: | 1.Pacific Oceanological Institute, Far East Branch,Russian Academy of Sciences,Vladivostok,Russia;2.Far East Federal University,Vladivostok,Russia;3.Kosygin Institute of Tectonics and Geophysics, Far East Branch,Russian Academy of Sciences,Khabarovsk,Russia;4.Shirshov Institute of Oceanology,Russian Academy of Sciences,Moscow,Russia;5.Center of Geoelectromagnetic Research,Shmidt Institute of Physics of the Earth,Troitsk,Russia;6.Institute of Marine Geology and Geophysics,Vietnam Academy of Sciences and Technologies,Hanoi,Vietnam |
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| Abstract: | The transverse current anomalies evident from magnetotelluric sounding (MTS) data in the transition zone from the Asian continent to the Pacific Ocean and a geoelectrical model suitable for explaining these effects are discussed. Using simulation results and new MTS data on Sakhalin and northern Vietnam, ultra-deep fluid–fault system (UDFFS) models are constructed, comprising steeply dipping low-resistivity and high-resistivity linear bodies which penetrate through the whole section of the lithosphere, continuing deep into the asthenosphere. The structure of these systems reflects the development of deep and ultra-deep fault zones, along which mantle-originated fluids may migrate through sediments to reach the surface. This allows the anisotropic–conductive fractured structures adjacent to these faults to be considered as being most favorable for hydrocarbon accumulations. |
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