Target-stratum-frequency-spectrum-based design method of non-linear scanning signal of vibroseis

A nonlinear scanning and scanning signal technology, applied in the field of nonlinear vibroseis scanning signal design

Active Publication Date: 2015-09-30
CHINA PETROCHEMICAL CORP +3
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Problems solved by technology

It adopts the excitation time and scanning method of different seismic sources to form a natural encoding function to encode the data received at the same time. However, this scanning method needs further theoretical analysis and seismic data acquisition practice to test

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  • Target-stratum-frequency-spectrum-based design method of non-linear scanning signal of vibroseis
  • Target-stratum-frequency-spectrum-based design method of non-linear scanning signal of vibroseis
  • Target-stratum-frequency-spectrum-based design method of non-linear scanning signal of vibroseis

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[0047] In order to make the above and other objects, features and advantages of the present invention more comprehensible, preferred embodiments are listed below and described in detail in conjunction with the accompanying drawings.

[0048] According to the principle of the vibroseis scanning signal, the essence of the design of the scanning signal is the design of the time-frequency curve, and then calculate the sinusoidal signal that can be used by the vibrator according to the nonlinear scanning signal formula.

[0049] Such as figure 1 as shown, figure 1 It is a flow chart of the design method of the non-linear scanning signal of the vibrator based on the frequency spectrum of the target layer in the present invention.

[0050] In step 101, the spectrum analysis of the target layer is performed by selecting the profile of the exploration area, logging or a typical single shot, and fitting the spectrum curve A(f). The process goes to step 102.

[0051] In step 102, the ...

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Abstract

The invention provides a target-stratum-frequency-spectrum-based design method of a non-linear scanning signal of a vibroseis. The method comprises: optimizing an exploration area profile, logging, or typical single gun and carrying out a target stratum frequency spectrum analysis, and carrying out fitting to obtain a frequency spectrum curve A(f); according to a frequency and energy requirement of an exploratory area, designing a starting frequency, a scanning length, and a start-stop slope length; solving a time function t(f) corresponding to each sampling frequency; carrying out inverse transformation on the time functions t(f) to obtain time frequency functions f(t); and carrying out integration on the time frequency functions f(t) to calculate an instantaneous phase, thereby calculating a sinusoidal vibroseis scanning signal. According to the invention, with the generated vibroseis scanning signal, objectives of improvement of the energy and signal to noise ratio of the target stratum of the exploratory area can be achieved. Especially for the complicated work area, the scanning signal design can be realized according to the different buried depths of target stratums at different zones of the work area, thereby improving the quality of seismic data excited by the vibroseis.

Description

technical field [0001] The invention relates to the field of seismic exploration of an oilfield vibrator, in particular to a design method for a nonlinear vibrator scanning signal. Background technique [0002] The vibroseis spreads the energy into the ground in a relatively long period of time. Using correlation processing, the long-duration signal can be compressed into a short-duration correlated wavelet signal, which is the ground reflection and propagation characteristics trimmed The quality of the scanning signal directly affects the quality of the data collected by the vibrator. [0003] There are many scanning signal design methods, the most commonly used are linear and nonlinear scanning, among which linear signal is the most widely used, easy to implement, each frequency distribution is uniform, the scanning energy is evenly distributed, and the energy occupied by the unit frequency is the same; while the nonlinear scanning signal is mainly It is proposed because ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V1/04
Inventor 魏福吉赵国勇张剑胡立新于富文亓志伟梁亮宋宁宁
Owner CHINA PETROCHEMICAL CORP
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