Phase-control array seismic prospecting method

A seismic exploration and phased array technology, which is applied in the field of shallow artificial seismic exploration, can solve the problems of mutual interference of seismic waves, non-directional exploration, limited number of seismic sources, etc., and achieve improved signal-to-noise ratio, improved seismic exploration effect, and good exploration effect Effect

CN1220884CInactive Publication Date: 2005-09-28JILIN UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Publication Date
2005-09-28
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention discloses a phased array seismic prospecting method, which adopts a plurality of vibrator sources arranged in a collinear manner at uniform intervals. By controlling the time delay or phase difference of each vibrator, the scanning signals sent by each vibrator are superimposed in the same phase in a certain direction underground, and the vibration signal is strengthened. By changing the time delay and phase difference of each seismic source, the orientation of the seismic beam is realized, making directional seismic exploration possible. The phased array seismic exploration method provides an effective method for seismic exploration of steeply inclined geological bodies, realizes directional seismic exploration, and can also improve the depth and resolution of seismic exploration, and solve the problem that the number of seismic sources in combined earthquakes cannot be limited. Too many questions.
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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] Assuming that the seismic sources vibrate at the same time, the vibration signals generated by each seismic source propagate underground independently. Due to the distance between the seismic sources, there will inevitably be a wave path difference at any observation point underground, and the phase difference caused by the wave path difference will be Strengthen the signal in some areas and weaken the signal in some areas. 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 se...

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Embodiment Construction

[0010] Below in conjunction with the accompanying drawings for further detailed description, the method includes the following sequence and steps:

[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] Then, place vibroseis 1, 2, 3... n at equal intervals to form a vibrator array, and the array of geophones 4, 5, 6... and the array of vibroseis are equidistant Collinear arrangement, determine the trace spacing and offset according to th...