Single-seismic source directional lighting seismic signal synthesizing method

Abstract

The invention relates to a geophysical surveying method, in particular to a directional lighting seismic signal synthetic method which is based on a single seismic source in the seismic prospecting. Equidistant shotpoints with the odd number of more than one to n are designed on a surveying line; at the same time, equidistant track space demodulator probes with the number of more than one to N are arranged on the surveying line; the single shot seismic data of the shotpoint 1 are obtained through a controlled seismic source, the single shot seismic data of the shotpoint 2 are obtained by moving the shotpoints, the single shot seismic data of the shotpoint 3 are obtained by moving the shotpoints, and then the single shot seismic data of the shotpoints with the number of n are obtained by analogy; the single shot seismic data are made linear superposition after being delayed, and are synthesized into the directional lighting seismic signals with directivity, which correspond to a positioning seismic wave field. By comparing the directional lighting seismic signal synthetic method which is based on a single epicenter with the phase control seismic signals, the noise-signal ratio of the signals is improved, the needed number of seismic sources is few, the working cost is low, the operation is simple, and the problem of the inconsistency of a plurality of shock devices is overcome.

Description

Technical field: [0001] The invention relates to a geophysical measurement method, in particular to a single seismic source-based directional illumination seismic signal synthesis method in seismic exploration. Background technique: [0002] The existing vibrator seismic exploration can be divided into two categories according to the number of seismic sources involved in the work. One is a single source; the other is an array source. The seismic wave field excited by a single source in the underground half-space can be approximated as a spherical wave field without directionality; the seismic wave field excited by an array vibroseis has obvious directionality. Array sources are further divided into combined sources and phase-controlled sources. The direction of the seismic wave field excited by the combined source is determined, and the direction of the main beam is vertical to the ground downward; the seismic wave field excited by the phase-controlled source also has dire...

AI Technical Summary

Problems solved by technology

Directional illumination seismic signal synthesis method can effectively solve the problem of low signal-to-noise ratio in seismic exploration of strong noise geological bodies and inclined geological bodies

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