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Vibroseis data correlation method capable of improving seismic resolution

A seismic data and resolution technology, applied in the field of geophysical exploration, to achieve the effect of improving resolution

Inactive Publication Date: 2012-02-01
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

In the usual ground absorption Q value compensation process, only the time-varying absorption is compensated, and the problem is not dealt with from the two variables of frequency and time

Method used

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  • Vibroseis data correlation method capable of improving seismic resolution
  • Vibroseis data correlation method capable of improving seismic resolution
  • Vibroseis data correlation method capable of improving seismic resolution

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Embodiment Construction

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

[0041] The present invention is realized through the following steps:

[0042] 1) Vibroseis seismic data, record vibration data and reference scanning signals before correlation;

[0043] The reference scanning signal described in step 1) may be the actual vibroseis characteristic signal.

[0044] The characteristic signals of the vibrator refer to the force signal, the weight acceleration signal, the bottom plate acceleration signal and the return signal of the vibrator, which are also called true reference signals.

[0045] The vibration data before correlation described in step 1) is the original vibration data recorded by the instrument without correlation processing. 2) Obtain the formation quality factor Q value of the work area by means of scanning;

[0046] In step 2), the calculation of the Q value is performed with different Q values ​​for Q value compen...

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Abstract

The invention relates to a vibroseis data correlation method capable of improving the seismic resolution, which is used for carrying out data acquisition and processing by using a vibroseis as an excitation source. The method comprises the following steps of: obtaining a Q value of a stratum quality factor of a work area by a scanning mode; modifying a reference scanning signal to obtain a time varying scanning time; and multiplying the time varying scanning signal by a seismogramme f the vibroseis and adding the time varying scanning signal and the seismogramme f the vibroseis to obtain correlation values and repeatedly circulating until the maximum listening time is up so as to complete the vibroseis data correlation of the time varying scanning signal. Compared with a conventional correlation method, the vibroseis data correlation method has the ground absorption time frequency compensating capability, so that the data resolution is improved.

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 vibroseis data correlation method for improving seismic resolution. 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 HSE considerations, in some areas, especially in the internatio...

Claims

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Application Information

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IPC IPC(8): G01V1/36
Inventor 曹务祥王新全李培明郭洪启
Owner BC P INC CHINA NAT PETROLEUM CORP
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