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High-power extremely low frequency and ultralow frequency artificial source electromagnetic method for geological prospecting

A kind of geological exploration, extremely low frequency technology, applied in the direction of electromagnetic wave detection, etc., can solve the problem that the radio wave cannot cover in all directions, affecting the measurement accuracy, etc., to achieve the effect of simple measurement, stable signal, and large detection range.

Inactive Publication Date: 2011-08-24
中国船舶重工集团公司第七研究院
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Problems solved by technology

Russia once reported a specific ultra-low frequency emission source technology, specifically two parallel 110kv power lines grounded at both ends of 60km at a distance of 10km, the maximum current is 330A, and its directivity is 8-shaped in the direction of the antenna. The radio measurement method is mainly suitable for ultra-low frequency work. Due to the limitation of directionality, the radio wave cannot cover all directions, thus affecting the measurement accuracy

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  • High-power extremely low frequency and ultralow frequency artificial source electromagnetic method for geological prospecting
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  • High-power extremely low frequency and ultralow frequency artificial source electromagnetic method for geological prospecting

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Embodiment Construction

[0017] Such as figure 2 As shown, choose an area with extremely low conductivity, such as the Archaean rock area, the qualified apparent resistivity is 5000-20000Ωm, the thickness of the high-resistance layer is 20-30km, and its area can accommodate the layout of the transmitting antenna. The ultra-low frequency transmitting antenna, the antenna adopts the form of a low frame, which can be a single pair or two pairs of vertical 60-110kv power lines grounded at both ends, the latter will maintain 360-degree omnidirectionality; the length of each pair of antennas is not less than 60 kilometers, and the grounding resistance It is permanent type, designed according to the power grounding standard, the grounding resistance is not more than 2 ohms, the power of the transmitter fed by each pair of antennas is not less than 500kw, and the frequency stability is better than 1×10 -8 , the maximum current of the antenna is 350A. Under the above conditions, a large-scale fixed broadcast ...

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Abstract

The invention discloses a high-power extremely low frequency and ultralow frequency artificial source electromagnetic method for geological prospecting. In the method, a transmitting antenna is arranged in a region with extremely low electric conductivity; the qualified apparent resistivity of the region is in the range of 5,000 to 20,000 ohm m and the thickness of a high resistance layer of the region is in the range of 20 to 30km; the transmitting antenna is an extremely low frequency or ultralow frequency transmitting antenna, is erected in a low frame mode and has the length of not less than 60km; the transmitting antenna adopts a power grounding standard; grounding resistance is permanent; the resistance value of the grounding resistance is not more than 2 ohms; and a feeding transmitter has the power of not lower than 500kw, the frequency stability superior to 1*10<-8> and the current of 300 to 350A. For the artificial source electromagnetic method, a transmitted signal has high strength, the amplitude-phase is stable, the signal-to-noise ratio, anti-jamming capability, measurement accuracy and efficiency are high, the detection range is wide, measurement is simple and convenient, and conditions are provided for earthquake prediction, three-dimensional electromagnetic prospecting and development of an ocean resource detection technology.

Description

Technical field [0001] The present invention is a high-power artificial source electromagnetic method for geological exploration produced by combining extremely low-frequency or ultra-low-frequency radio transmission technology with geophysics, and belongs to an alternating current method in electrical exploration. Background technique [0002] There are many methods of geological prospecting in geophysics, such as acoustic prospecting (artificial seismic method), magnetic prospecting, gravity prospecting, electrical prospecting, etc. Among them, electrical prospecting has high efficiency, low cost, and wide applicability. Advantages, widely used at home and abroad. The earliest electrical method proposed was the magnetotelluric sounding method proposed by A.H.Tikhonov in 1950 and L.Cagniard in 1953 in the early 1950s, referred to as the MT method. The MT method uses the very low electromagnetic waves with a frequency of a few thousandths to thousands of hertz produced on t...

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Application Information

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IPC IPC(8): G01V3/12
Inventor 陆建勋马宗晋王东山赵国泽张大奎汤吉底青云毕文斌
Owner 中国船舶重工集团公司第七研究院
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