A method for generating and processing scanning signals of a vibrator
A technology for scanning signals and seismic sources, applied in the field of geophysical exploration, can solve problems affecting the resolution of seismic records, and achieve the effect of improving resolution and signal-to-noise ratio
Active Publication Date: 2019-02-05
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology
However, the autocorrelation functions of traditional linear scanning signals and nonlinear scanning signals have obvious side lobes, which seriously affect the resolution of seismic records.
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[0038] The implementation of the present invention will be described in detail below in conjunction with the accompanying drawings and examples, so as to fully understand and implement the process of how to apply technical means to solve technical problems and achieve technical effects in the present invention. It should be noted that, as long as there is no conflict, each embodiment and each feature in each embodiment of the present invention can be combined with each other, and the formed technical solutions are all within the protection scope of the present invention.
[0039] In addition, the steps shown in the flow diagrams of the figures may be performed in a computer system, such as a set of computer-executable instructions, and, although a logical order is shown in the flow diagrams, in some cases, the sequence may be different. The steps shown or described are performed in the order herein.
[0040] In the process of seismic exploration, the vibroseis is the most succ...
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The invention discloses a method for producing and processing a scanning signal of a vibroseis, and the method is applied to the technical field of seismic exploration. The method comprises the following steps: generating a first pseudo-random sequence; processing the first pseudo-random sequence based on the predetermined maximal scanning time and sampling period of the vibroseis, thereby obtaining a second pseudo-random sequence; carrying out bandpass filtering on the second pseudo-random sequence so as to output a pseudo-random scanning signal with a specified waveband; performing optimization treatment on the pseudo-random scanning signal by use of a signal windowing technology so as to obtain a pseudo-random scanning signal with reduced Gibbs effect. According to the method, by virtue of fully utilizing the favorable autocorrelation characteristic of the pseudo-random sequence and utilizing a frequency spectrum shaping filtering technology and the signal windowing technology, the pseudo-random scanning signal generated by the vibroseis is optimized, so that the distinguishability and signal to noise ratio of the vibroseis during seismic exploration can be effectively improved.
Description
technical field [0001] The invention relates to the technical field of geophysical prospecting, in particular to a method for processing scanning signals of a vibrator. Background technique [0002] In the process of seismic exploration, the seismic source is an important part of seismic exploration technology, and the quality of the signal generated by it directly affects the effect of seismic exploration. In land seismic exploration, due to the environmental damage and pollution of the explosive source as the main source, the vibrator in the non-explosive source has become the main source instead of the explosive source. [0003] The quality of the excitation signal of the vibrator affects the exploration resolution, and the quality of the excitation signal is related to the scanning mode. The scanning methods of vibroseis seismic exploration are divided into linear scanning and nonlinear scanning. However, the autocorrelation functions of traditional linear scanning sig...
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IPC IPC(8): G01V1/04
Inventor 杨丽胡华锋佘德平蔡瑞张瑶薛昭
Owner CHINA PETROLEUM & CHEM CORP