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Phased source consistency determining method

A determination method and consistent technology, applied in the field of seismic exploration, can solve problems such as misinterpretation of underground structures, inability to ensure that directional seismic waves can be excited by phase-controlled sources, and unavailability of phase-controlled sources, and achieve the effect of improving the signal-to-noise ratio of collected data.

Inactive Publication Date: 2012-11-28
JILIN UNIV
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Problems solved by technology

If the consistency judgment is not carried out, it is impossible to ensure that the phased vibrator excites directional seismic waves, and false reflection waves will appear in the seismic exploration data, resulting in wrong interpretation of the underground structure and making the phased vibrator unusable

Method used

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Embodiment Construction

[0030] The consistency judgment method of phase-controlled vibroseis, aiming at the high-precision seismic exploration requirements of vibroseis, proposes a comprehensive quantitative evaluation method based on time-domain correlation analysis and supplemented by FFT spectrum analysis. Through this judgment method, it can be guaranteed that the phased vibrator system that meets the consistency standard has a vertical positioning accuracy error of no more than 2m; the actual signal-to-noise ratio improvement ability is compared with the theoretical value, and the signal-to-noise ratio drops by no more than 3dB; In addition to the analysis results in the time domain, the seismic source system that meets the performance requirements also provides inconsistent auxiliary quantitative judgments in the frequency domain to provide a basis for the adjustment and maintenance of the seismic source. The method of the invention provides a necessary instrument quality judgment method for ens...

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Abstract

The invention relates to a phased source consistency determining method. The determining method comprises the following steps that: the vertical positioning accuracy error of a phased source is not more than 2m; for the improvement capability of an actual signal-to-noise ratio compared with a theoretical value, the signal-to-noise ratio decreases by not more than 3 dB; each source excitation signal has high linearity; different source signals are superposed in an out-of-phase manner to cause the signal signal-to-noise ratio; the phases of two quantitative signal waveforms are consistent; and if the conditions are met, the phased sources are regarded as consistent phased sources; otherwise, the phased sources are regarded as inconsistent phased sources. Tests prove that the determining method is applicable to the consistency testing process of any phased sources, combined sources and a plurality of controlled sources, and provides necessary collection quality assurance measures for field data collection of phased source seismic prospecting methods. Testing results show that the signal-to-noise ratio of the collected data is improved to a great extent. The phased source consistency determining method provides a basis for phased source performance evaluation, phased source system maintenance and effective collection of phased source seismic data, and simultaneously also can provide effective technical means for phased source maintenance and qualification testing.

Description

Technical field: [0001] The invention relates to a seismic prospecting method, in particular to a method for judging the consistency of a phase-controlled seismic source. Background technique: [0002] The vibroseis seismic exploration method has received more and more attention in seismic exploration due to its non-destructiveness to the environment. The main problems of vibrator seismic exploration are weak source energy, strong background noise, and low signal-to-noise ratio of received data. In order to increase the output force of the source system and improve the quality of the seismic data of the vibrator, a phase-controlled source system can be used. The phased vibrator is a kind of array source technology, which requires high consistency of each source involved in the work, but there is no method for evaluating the consistency of the phased source. If the consistency judgment is not carried out, it is impossible to ensure that the phased vibrator excites direction...

Claims

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Application Information

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IPC IPC(8): G01V1/28G01V1/30G01V1/36
Inventor 姜弢林君徐学纯冯博
Owner JILIN UNIV
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