Multi-factor scanning method of controllable vibroseis

A scanning method and sub-scanning technology, applied in the field of geophysical exploration field collection, can solve problems such as difficulty in operation and waste of resources, and achieve the effects of improving data quality, suppressing harmonic interference, and saving exploration costs.

Inactive Publication Date: 2011-05-18
BC P INC CHINA NAT PETROLEUM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The disadvantage of this method is that the sub-scan group needs to be determined by trial and error and empirically, which is difficult to operate and wastes resources

Method used

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  • Multi-factor scanning method of controllable vibroseis
  • Multi-factor scanning method of controllable vibroseis
  • Multi-factor scanning method of controllable vibroseis

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Embodiment Construction

[0040] The present invention will be described in detail below in conjunction with the accompanying drawings.

[0041] The specific implementation of the vibroseis multi-factor scanning method is as follows:

[0042] 1) Excite seismic waves with broadband scanning signals to complete the record collection of test points;

[0043] Step 1) the scanning signal of the described broadband is:

[0044] s ( t ) = A ( t ) sin 2 π ( f s t + f e - f s 2 T t 2 ) - - - ( 1 ...

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Abstract

The invention relates to the field acquisition field of earth physical exploration, in particular to a multi-factor scanning method of a controllable vibroseis. The method comprises the following steps of: exciting an earthquake wave with a wide-frequency scanning signal to finish acquisition; selecting a receiving channel to make an amplitude spectrum and a frequency division scanning field; decomposing the signal to create a group of sub-scanning with different start frequency and end frequency for spectrum superposition and factor superposition and comparing the superposed spectrum with practical data to confirm a sub-scanning group; combining sub-scanning for field acquisition, carrying out the frequency division scanning of the amplitude spectrum, comparing amplitude spectrum data and frequency division records to confirm the best sub-scanning factor and mapping. The invention can reduce the correlated sidelobe of data, improve the signal-to-noise ratio of the data, effectively restrict harmonic interference, lessen the blindness of tests, improve the data quality and save exploration expenditure.

Description

technical field [0001] The invention relates to the field of geophysical prospecting field acquisition, which is a method of designing sub-scanning groups based on actual data, forming multiple superimposition of signals, and realizing the function of non-linear scanning by means of linear scanning, thereby reducing the relevant side lobes of data and improving the accuracy of data. Vibroseis multi-factor scanning method for signal-to-noise ratio and resolving power. Background technique [0002] Seismic data collection is mainly to use seismic method to excite seismic wave field, and use recording equipment to record seismic wave field. Since seismic waves propagate in the earth, they carry underground geological information, and seismic data processing can invert the characteristics of underground strata. The energy supply methods for onshore seismic exploration are mainly explosives and vibroseis. Explosive sources generally need to be excited in wells, and vibroseis vib...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V1/28
Inventor 曹务祥李培明
Owner BC P INC CHINA NAT PETROLEUM CORP
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