The Study Of Pseudorandom Sweeps Technology Based On Seismic Vibrator

Seismic wave in seismic exploration is generated by artificial stimulation. The source which generates the wave is called artificial seismic source. Artificial seismic source can be divided into two kinds: explosive seismic source and non-explosive seismic source. Up to now, the vibroseis is the most successful developed non-explosive seismic source. The vibroseis is different from the other seismic sources, such as bomb, hammer impulsion, and so on. The wave generated by vibroseis can be controlled by one time-variation function expression which we already known. In another word, we take the wave generated by using a little energy but long time sending to replace the wave generated by using a large energy but in an instant. The principle of seismic exploration by using vibroseis is:①Vibroseis sends scanning signal into the underground by using continuous seismic wave.②The seismic wave reflects at the interface of heteroid underground layers or underground object surface.③Reflected wave enters into seismic recorder through detectors.④Seismic recorder receives the reflected wave and transforms it into impulse signal with delayed information through correlation technology.⑤Using the signal to realize the detection of underground objects and complete the imaging of the underground information. The main problem of seismic exploration by using vibroseis is: low seismic power, narrow signal waveband, and low distinguishability.This theme detailedly analyzes the scanning technology for vibroseis. The scanning type can be divided into two categories: linear sweep and...