Geophone for soft sandy soil

Abstract

The invention belongs to the technical field of seismic exploration, and relates to a geophone for soft sandy soil. The geophone comprises a probe part, a connecting part and a signal receiving part,the probe part comprises a sensor and a digital-to-analog converter, the sensor collects seismic wave signals and converts the seismic wave signals into analog-to-digital signals, the digital-to-analog converter converts the analog-to-digital signals into digital-to-analog signals, and the signals are transmitted to the signal receiving part; the signal receiving part receives and processes the electric signal; the connecting part is connected with the signal receiving part and the probe part and used for adjusting the detection depth of the probe part. The probe of the detector can be buriedbelow an underground water surface or a bedrock top interface so that seismic waves are prevented from being absorbed by soft sandy soil on the ground surface, and seismic wave signals can be detectedmore accurately.

Description

technical field [0001] The invention relates to a seismic detector for soft sandy soil, and belongs to the technical field of seismic exploration. Background technique [0002] Principles of seismic exploration, such as figure 1 As shown, it is a method to detect the properties of underground media by using seismic waves passing through underground rocks. This seismic wave is artificially excited, such as the detonation of explosives, the vibration of the vibrator weight and the release of high-pressure water vapor from the airgun source. As these seismic waves travel to the surface, they are recorded by detectors placed on the surface. However, if the surface of the observation area is covered with soft sand, the seismic signal will lose a lot of energy when penetrating through this layer of soft ground cover, which will cause signal distortion. Such as figure 2 As shown, in the desert, because the surface is covered with very thick sand, these sand particles are not c...

AI Technical Summary

Problems solved by technology

However, since the sensor 1 is fixed on the surface and the length of the metal plug 2 is short, it can only detect the seismic wave signal close to the surface, but at this time the seismic wave signal has been mostly absorbed by the sand, and the detection effect is very poor

Increasing the length of the metal plug increases the difficulty of securing the geophone and can easily cause the probe to bend or break

In addition, because the shape of the soft sand is not fixed and there are many gaps, it is difficult to accurately control the angle and depth of the geophone insertion into the soft sand, and even the insertion angle will change during the detection process, resulting in inaccurate detection results

[0004] To sum up, the current design of geophones and the way of receiving signals on the surface have great limitations, and cannot acquire high-quality seismic signals

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