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Time varying controllable focal force signal deconvolution method

A deconvolution and time-varying force technology, applied in the field of geophysical exploration, which can solve the problems of poor data quality, affecting the effect of inversion, and failing to consider the change of force signal.

Inactive Publication Date: 2014-09-03
BC P INC CHINA NAT PETROLEUM CORP +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in the process of data inversion, this method does not take into account the change of the force signal, does not suppress the inherent harmonic distortion of the force signal, and the quality of the data is not good, which affects the effect of the inversion

Method used

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  • Time varying controllable focal force signal deconvolution method
  • Time varying controllable focal force signal deconvolution method
  • Time varying controllable focal force signal deconvolution method

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Experimental program
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specific Embodiment approach

[0048] 1) Acquire vibroseis seismic data, and record the vibration data and force signals before correlation;

[0049] The force signal of the vibrator in step 1) is the weighted sum of the weight acceleration signal and the base plate acceleration signal.

[0050] The vibration data before correlation described in step 1) is the original vibration data recorded by the instrument without correlation processing.

[0051] 2) Combined with the quality factor Q value of the formation, the time-varying force signal of the structure:

[0052] A = A 0 e - π Q - 1 ft - - - ( 1 )

[0053] f = f s + ...

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Abstract

The present invention is a time-varying vibroseis force signal deconvolution method that improves the resolution of seismic data, records the vibration data and force signal before correlation, combines the quality factor to construct the time-varying force signal, and deconvolutes the vibrator vibration record Calculate the reflection coefficient series by multiplying and adding the time-varying force signal and the vibration record of the vibrator to obtain the correlation value of the formation quality factor, and then correlate the time-varying force signal with the vibroseis data to obtain the inverse wavelet formula, The reflection coefficient series is obtained by deconvolution, and the compensation ability of the present invention changes with the change of the Q value, so that the signal-to-noise ratio of the data is significantly improved, the influence of the force signal is removed, and the related noise caused by the distortion of the force signal is also removed.

Description

technical field [0001] The invention relates to geophysical exploration technology, belongs to the technical field of data acquisition and processing using a vibrator as an excitation source, and is a time-varying vibroseis force signal deconvolution method for improving the resolution of seismic data. 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 the characteristics of underground strata can be inverted through seismic data processing. The key to the problem is to obtain high-quality seismic data. Currently, the energy supply methods for onshore seismic exploration are mainly explosives and vibroseis. Explosive sources generally need to be excited in wells, and vibroseis vibrate on the earth's surface. Due to safety needs and environmental protection con...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01V1/28G01V1/36
Inventor 曹务祥孙哲
Owner BC P INC CHINA NAT PETROLEUM CORP