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Self-adapting ground surface consistency deconvolution method of controllable earthquake source

A deconvolution and consistent technology, applied in the field of petroleum geophysical exploration, to improve the quality of treatment, improve the success rate of well drilling, and widen the scope

Inactive Publication Date: 2009-10-14
BGP OF CHINA NAT GASOLINEEUM CORP
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Problems solved by technology

However, the relevant wavelet of the vibroseis is usually considered as the zero-phase wavelet. For many years, the pure phase filtering method is mainly used to convert the wavelet from zero phase to small phase for data processing of the vibrator. There are some problems with the actual seismic data of near-surface and terrestrial Q-absorption

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  • Self-adapting ground surface consistency deconvolution method of controllable earthquake source

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Embodiment Construction

[0030] The present invention provides the following vibroseis self-adaptive surface consistent deconvolution method, which specifically includes the following steps:

[0031] 1. Use a vibrator to excite seismic waves;

[0032] Use a vibrator to excite seismic waves and record them with an instrument. The scanning signal generated by the mechanical vibration of the vibrator is as follows: figure 1 shown. in, figure 1 (a) is the vibroseis scanning signal without Q absorption, (b) is the related wavelet, and (c) is the frequency spectrum of the wavelet. figure 2 (a) is the vibroseis scanning signal with ground Q absorption, (b) is the relevant wavelet, and (c) is the spectrum of the wavelet. Compare figure 1 and figure 2 It can be seen that the wavelet without Q absorption is a zero-phase wavelet, while the wavelet under the Q absorption condition becomes a mixed phase wavelet. The effect of Q absorption can also be seen from the spectrum.

[0033] image 3 is the actua...

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Abstract

The invention relates to a processing technology of petroleum geophysical exploration data, which is a rapid and effective self-adapting ground surface consistency deconvolution method of a controllable earthquake source. The concrete steps are as follows: using a conventional controllable earthquake source to vitalize and record seismic wave data; adopting the earthquake record of the controllable earthquake source and performing absorption analysis at a selected time window to obtain an amplitude spectrum of a shot point or a demodulation point at a Q absorption model channel in a t1-t2 time window; performing Fourier transform to a scanning signal of a cannon to obtain the amplitude spectrum of scanning related wavelets; working out the exploration factor h(t); and obtaining an imaging section which has an obvious improvement in waveforms of a shallow layer, a middle layer and a deep layer and is vitalized by the controllable earthquake source and an explosive source. The invention can improve the resolving capability and realize phase switching, has the self-adapting capacity of ground surface consistency counting and can obviously improve a controllable earthquake source first-motion wave having larger near ground surface absorption influence to ensure that the processing quality of earthquake data is obviously improved.

Description

technical field [0001] The invention relates to petroleum geophysical prospecting technology, in particular to a method for self-adaptive surface consistent deconvolution of a vibrator for seismic data processing. technical background [0002] Seismic exploration is a general term for the method of using artificially excited seismic waves to survey the crustal structure and stratum lithology related to underground oil, natural gas and coal fields. Due to the different mechanical properties of underground media, seismic waves will cause spatial changes in the frequency, amplitude, phase, velocity, and wave field type of seismic waves during propagation, which can be obtained by using high-precision recording equipment and corresponding observation methods on the surface or underground. The data of these characteristic parameter changes are converted into images that geologists (including oil and gas field and coal field development engineers) can recognize after undergoing de...

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Application Information

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IPC IPC(8): G01V1/28G01V1/40
Inventor 凌云高军
Owner BGP OF CHINA NAT GASOLINEEUM CORP
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