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Phased array seismic prospecting method

A seismic exploration and phased array technology, applied in the field of shallow artificial seismic exploration, can solve the problems of mutual interference of seismic waves, limited number of seismic sources, and inability to conduct directional exploration, so as to improve the signal-to-noise ratio, improve the exploration effect, and improve the seismic exploration effect. Effect

Inactive Publication Date: 2005-01-05
JILIN UNIV
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Problems solved by technology

Combined seismic exploration refers to the simultaneous vibration of several single seismic sources. Although the seismic waves generated by each seismic source can strengthen the seismic wave energy that propagates downward vertically and in the direction of the surface, it cannot generally enhance the seismic wave energy in other directions. Therefore, it is not suitable for the exploration of steeply inclined geological bodies, let alone directional exploration
Furthermore, the number of seismic sources used in combined earthquakes is limited, and generally cannot exceed 4. Too many seismic sources will cause mutual interference of seismic waves during propagation, and the effect will be worse.

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Embodiment Construction

[0011] First of all, it is necessary to determine the source spacing d, which is restricted by various conditions. In order to avoid the occurrence of grating lobes, d<λ / 2 should be satisfied; to improve the direction coefficient, the spacing d should be larger; to approximate the far-field model, the spacing d should be Get smaller. Various conditions restrict each other and need to be considered comprehensively. For the "electromagnetic high-power shallow seismic vibroseis system" disclosed in CN1643891, the distance d between adjacent vibroseis can be selected to be about 2-4 meters.

[0012] The specific method of realizing phased array seismic exploration is given below by giving phase difference control method.

[0013] If the phase-controlled seismic source works, the phase difference between adjacent seismic sources is controlled to be φ=(2π / λ)kd Sinθ (formula 1), and k is the sequence number 1, 2, ... n of the seismic sources in Fig. 1 .

[0014] Then the signals gen...

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Abstract

The invention discloses an earthquake detecting method with phase array; it arranges several controllable epicenters collinearly with even interval. The scanning signal sent by each controllable epicenter overlaps in some direction in phase through controlling the delay or the phase difference of the controllable epicenter, the vibration signal is reinforced, thus realizes the orientation of earthquake beam, thus the earthquake detection is possible. Using the phase array method, it provide an effective method for earthquake detection of tilted geologic body, realizes oriented earthquake detection, additional, it also upgrade the detecting depth and the resolution.

Description

Technical field: [0001] The invention relates to a shallow layer artificial seismic exploration method, which is especially suitable for the seismic exploration environment where multiple vibrators are constructed simultaneously. Background technique: [0002] In the existing combined seismic exploration of reflection method, several single seismic sources with small output force are combined together to simulate a seismic source with large output force to increase the depth of seismic exploration. Combined seismic exploration refers to several single seismic sources vibrating at the same time. Although the seismic waves generated by each seismic source can strengthen the seismic wave energy that propagates vertically and downward to the surface, it cannot generally strengthen the seismic wave energy in other directions. Therefore, it is not suitable for exploration of steeply inclined geological bodies, let alone directional exploration. Furthermore, the number of seismic ...

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Application Information

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IPC IPC(8): G01V1/02
Inventor 林君陈祖宾姜弢陈鹏程张林行李晓旭
Owner JILIN UNIV
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