A Method of Weighted Correlation of Vibroseis for Improving Signal-to-Noise Ratio
A signal-to-noise ratio and seismic source technology, which is applied in the field of oil and gas geophysical exploration, can solve the problems of constant scanning time, impossible to change the output size, and inability to apply vibroseis, etc., to achieve a high signal-to-noise ratio
Active Publication Date: 2019-06-04
CHINA PETROLEUM & CHEM CORP +1
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The second is to directly increase the output of a certain frequency in the scanning signal, and the scanning time remains unchanged. However, due to the limitation of the mechanical work of the vibrator, it is impossible for the vibrator to change the output during the scanning process, and only one output can be set. size, such as 70%, 80%, then this signal cannot be applied to the work of vibrators, but can be applied to related processes
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[0027] Preferred embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although preferred embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.
[0028] The invention is a vibroseis weighted correlation technology aimed at improving the signal-to-noise ratio of a single shot. The method converts the energy of the main frequency part of the reference signal into a weighted scanning signal by increasing the energy of the main frequency part of the reference signal before correlation, and then combines the weighted scanning signal with the original parent record. Correlation is performed...
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The invention discloses a vibroseis weighted correlation method for increasing the signal-to-noise ratio. The method comprises the steps of obtaining a main frequency and the slope of the main frequency part of a vibroseis single shot; modifying the frequency spectrum of a reference signal, and increasing the energy of the main frequency part to obtain a weighted frequency spectrum curve; converting the weighted frequency spectrum curve into a weighted scanning signal; and using the weighted scanning signal to correlate with the original record to obtain a weighted correlated vibroseis single shot record. In the method, the energy of the main frequency part of the reference signal is increased before correlation and converted into a weighted scanning signal, then the weighted scanning signal is correlated with the original mother record to obtain the single shot record, the single shot record obtained by the method has a higher signal-to-noise ratio than a single shot record obtained by a conventional method.
Description
technical field [0001] The invention relates to oil and gas geophysical exploration, and more specifically, relates to a method for weighted correlation of vibrators with improved signal-to-noise ratio. Background technique [0002] Vibrators are more and more widely used in the current seismic acquisition, especially in the western region, which is sensitive to the use of explosives, so it is even more necessary to expand the use of vibrators. The vibrator is different from the excitation of the explosive vibrator and needs to be excited on the ground surface, which makes the seismic wave propagation energy of the vibrator twice affected by the near surface. Therefore, the signal-to-noise ratio of a single shot of the vibrator is the focus of improvement. [0003] The method to improve the signal-to-noise ratio of the vibrator is mainly to select the best construction factors through experiments such as the number of vibrator units, scanning frequency, and output force. In ...
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IPC IPC(8): G01V1/36
CPCG01V1/362
Inventor 曾昭翰张洁
Owner CHINA PETROLEUM & CHEM CORP