Controlled source audio-frequency magnetotelluric (CSAMT) double-transmitting multi-receiving data acquiring system and CSAMT double-transmitting multi-receiving data acquiring method

Abstract

The invention provides a controlled source audio-frequency magnetotelluric (CSAMT) double-transmitting multi-receiving data acquiring system which comprises transmitting systems and a signal receiving system, wherein each transmitting system comprises two sets of transmitters and generators connected with the transmitters, power supply poles at both ends of a transmitting electric dipole are connected with the two transmitters by a switch, and two sets of transmitting systems share one transmitting electric dipole; the signal receiving system comprises more than three data collecting groups, each data collecting group comprises a multifunctional electric measuring instrument V8 receiving host machine and an electric field signal data collecting instrument RXU3E matched with the multifunctional electric measuring instrument V8 receiving host machine, and all receiving groups are generally arranged along a measuring line. The invention also provides a CSAMT double-transmitting multi-receiving data acquiring method which comprises the following steps of preparing and demarcating equipment, arranging receiving points, transmitting by power supply, receiving and transmitting by switch. The invention realizes the continuous transmission all day, shortens the investigation time and improves the working efficiency in such a way that two sets of transmitting systems share one transmitting electric dipole to alternately transmit.

Description

technical field [0001] The invention relates to the field of geophysical exploration, in particular to a controllable source audio frequency magnetotelluric double-transmission and multiple-reception data collection system and a collection method thereof. Background technique [0002] The magnetotelluric method (MT) is a method of geophysical electrical prospecting. It collects natural electromagnetic field signals, the frequency range is 500-0.0001Hz, and the corresponding exploration depth is from hundreds of meters to tens of kilometers. It is mainly used in tectonics Research and deep oil exploration. When the frequency response of the instrument reaches 10000-1Hz, because its main frequency range is equivalent to the audio frequency range, it is called the audio magnetotelluric method (AMT). Its exploration depth is from tens of meters to several kilometers, which is more applicable In the investigation of deep buried tunnels and underground caverns. However, the natu...

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Problems solved by technology

This in turn makes more receiving devices unable to synchronize and delay each other, greatly reducing work efficiency and failing to achieve the desired effect

That is to say, in the case of single sending and multiple receiving (more than 3 receiving groups), the daily production efficiency cannot be improved

[0007] In short, the existing Controlled Source Audio-frequency Magnetotelluric method (CSAMT) adopts a single transmitting system, whether it is single transmission and single reception, single transmission and double reception, or single transmission and multiple reception, these survey methods have relatively low work efficiency and consume a lot of energy. It takes a long time and cannot adapt to the requirements of the new situation

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