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Automatic identification and suppression method of single-frequency interference in seismic records

A single-frequency interference and seismic recording technology, applied in the direction of seismic signal processing, etc., can solve the problem of increasing the amount of calculation, and achieve the effect of improving the signal-to-noise ratio.

Active Publication Date: 2010-12-29
BGP OF CHINA NAT GASOLINEEUM CORP
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Problems solved by technology

The time-domain fitting method superimposes single-frequency interference with sine and cosine functions of different amplitudes, and the calculation method is more concise, but it only fits and suppresses interference of one frequency at a time. For multiple groups of single-frequency interference with integer multiples When , the amount of computation doubles

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  • Automatic identification and suppression method of single-frequency interference in seismic records
  • Automatic identification and suppression method of single-frequency interference in seismic records
  • Automatic identification and suppression method of single-frequency interference in seismic records

Examples

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example 1

[0060] The seismic data are three-component three-dimensional VSP acquisition data. Since the generator on the construction well site cannot be turned off, there is induced single-frequency interference on many seismic records, and the interference range reaches hundreds of meters. The single-frequency interference energy at the well site is mainly concentrated on the single frequency of 50Hz and its integer multiples ( figure 1 Left), using a general notch filter for filtering, the interference wave energy is suppressed to a lower level, but it is still not clean enough ( figure 1 middle). After the single frequency is removed by this method, it can be seen that the energy of the interference wave is significantly lower than the reflected wave field after suppression, and the single frequency interference is basically invisible. Compared with the notch filter, the signal-to-noise ratio is significantly improved ( figure 1 right). The frequency spectrum shows that the single...

example 2

[0063] Various industrial facilities in the oil production area will produce single-frequency induction noise during seismic exploration in large oil fields. Some noise cannot be avoided during acquisition, and some can be avoided but require high compensation for downtime. In the acquisition of this example, due to the industrial induction of the wellsite during 3D-VSP acquisition, a large area of ​​interference is formed on the single-shot seismic record, and the number of interference channels can reach more than 50%. These interference energies are extremely strong ( Figure 5 Left), it is mainly concentrated around 50Hz and its integer multiples of frequency, using multiple notch filters to combine filtering, the interference wave energy is suppressed to a lower level, but it is not clean enough ( Figure 5 middle). Utilize the method of the present invention, can find out by the contrast of time domain, after the interference wave is suppressed, the energy is obviously ...

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Abstract

The invention relates to an automatic identification and suppression method of single-frequency interference in seismic records of geophysical exploration, which comprises the following steps of: firstly, carrying out frequency domain energy statistics on a record before first arrival of each input gather, marking a single-frequency range with energy obviously higher than adjacent frequency ranges as a single-frequency interference channel, searching the accurate frequency value f of the single-frequency interference through an amplitude spectrum, and splitting the single-frequency interference channel for DC treatment; then, putting the sample point value of the split channel back to the original position to form a channel, and repeatedly processing all channels containing single-frequency interference to obtain an improved overlapped offset profile. The invention effectively increases the signal to noise ratio of seismic data without influencing the original wave field characteristics of normal channels.

Description

[0001] Field [0002] The invention relates to a seismic data processing technology in geophysical exploration, and is an automatic identification and suppression method for single-frequency interference in seismic records. Background technique [0003] The current seismic exploration technology mainly uses longitudinal wave exploration to obtain underground structure information, and then comprehensively utilizes other existing data to determine the drilling position. However, in actual seismic exploration, the quality of data will be affected by various factors, such as generators, high-voltage lines and Single-frequency interference generated by various industrial equipment, etc., these interferences sometimes have a serious impact on data quality. [0004] Seismic exploration technology is to use the first-arrival wavefront background interference energy information of seismic data collected by geophones or geophone combinations in surface seismic exploration and borehole ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V1/36
Inventor 李彦鹏陈沅忠
Owner BGP OF CHINA NAT GASOLINEEUM CORP
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