Array coil-based nuclear magnetic resonance ground water sounding instrument and field sounding method

Abstract

The invention relates to an array coil-based nuclear magnetic resonance ground water sounding instrument and a field sounding method. The instrument consists of a control unit, a transmitting coil and a receiving coil which are connected by a computer through a serial port line or a net port line, wherein the receiving coil is connected by 25 receiving units to form an array coil. The array coil serves as antennas of the receiving units, and each antenna is equipped with an independent receiving unit, so that two-dimensional ground water imaging can be realized, three-dimensional ground water imaging also can be realized, and high-sensitivity acquisition and long-distance data transmission can be realized. Moreover, the antennas can be laid under complex geographic and geomorphic conditions, the accuracy of nuclear magnetic resonance sounding on a horizontal plane is improved, the well site for exploiting the ground water can be efficiently and accurately determined, the water exploration efficiency is improved, the water exploration cost is reduced, and the risk of digging a dry well is effectively reduced.

Description

technical field [0001] The invention relates to a geophysical exploration equipment, in particular to a nuclear magnetic resonance groundwater detector for two-dimensional or three-dimensional detection of nuclear magnetic resonance groundwater based on array coils and a field detection method. Background technique [0002] Magnetic Resonance Sounding (MRS for short) is a direct and non-destructive geophysical exploration method, which has been widely used in 1D groundwater detection. [0003] CN101285895A discloses a method and system for a line power source to excite multi-channel receiving ground nuclear magnetic resonance, said method comprising the following steps: 1) using a transmitter to supply an alternating current of Larmor frequency to the ground through two transmitting electrodes driven into the ground , by changing the distance of the electrodes and the size of the current to generate different excitation magnetic fields; 2) Disconnect the excitation field, an...

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Problems solved by technology

The above inventions all expand the nuclear magnetic resonance detection method to 2-dimensional and 3-dimensional, and design a nuclear magnetic resonance groundwater detector with multiple acquisition channels, but there are deficiencies, such as it is difficult to receive the nuclear magnetic resonance response signal of nanovolt level amplitude with the probe; Use multiple channels of a collector to receive, and each coil should not be too far away from the collector, otherwise the signal attenuation will be serious; limited by complex terrain, lay multiple large coils on a straight line or lay multiple large coils on a plane difficult to realize

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