Data processing method and system for suppressing extremely strong environmental noise

An environmental noise and data processing technology, applied in seismic signal processing and other directions, can solve the problems of noise interference, affecting the signal-to-noise ratio of data, and inability to identify effective reflections from common shot traces, so as to improve the signal-to-noise ratio of data and suppress environmental noise. Effect

Pending Publication Date: 2021-04-23
BC P INC CHINA NAT PETROLEUM CORP +1
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

from figure 1 It can be seen from the figure that, except for the near-shot array that can identify the first arrival and reflection, the far array is completely submerged in the strong energy anomaly interference, which seriously affects the signal-to-noise ratio of the data.
processed, figure 2 for figure 1 Gain display graph of the , it can be seen that due to noise interference, effective reflections cannot be identified in the common shot point gather at all

Method used

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  • Data processing method and system for suppressing extremely strong environmental noise
  • Data processing method and system for suppressing extremely strong environmental noise
  • Data processing method and system for suppressing extremely strong environmental noise

Examples

Experimental program
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Effect test

Embodiment 1

[0057] Taking the Lengbei slope area as an example, the seismic data of the original shot points in this area were collected, and after elevation static correction processing, as follows: Figure 5 Shown is the pure wave stacked profile of the original data in the Lengbei slope area. Depend on Figure 5 It can be seen that the superimposed section contains extremely strong environmental noise in the data, and it is difficult to identify the structural form and target layer from the section, and the entire section is completely submerged in the interference noise.

[0058] By analyzing the distribution of environmental noise in multiple domains including shot domain, CMP domain, OVT domain and common receiver point domain, it can be seen that environmental noise is generally developed (or concentrated in a certain area) in the common shot point domain, suppressing The effect is not ideal, but it is randomly distributed in CMP, OVT, common detector points and other domains; for...

Embodiment 2

[0069] Taking the Lengbei slope area as an example, the original data of far and near shot point arrays in this area are processed by using the data processing method for suppressing extremely strong environmental noise of the present invention.

[0070] Such as Figure 12 As shown, it is a schematic diagram of the original record of the far shot point arrangement. In the figure, the effective reflection is completely submerged in the strong energy anomalous noise and environmental noise, and the first arrival information cannot be recognized. Such as Figure 13 As shown, it is a schematic diagram of recording after comprehensive denoising of far-shot point arrangement. It can be seen that the abnormal interference is well suppressed, the signal-to-noise ratio of the data is greatly improved, and effective reflection information can be seen on a single shot after denoising .

[0071] Such as Figure 14A to Figure 15B Shown is the original record and spectrum diagram of near...

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Abstract

The invention provides a data processing method and system for suppressing extremely strong environmental noise. The method comprises the steps of: obtaining the seismic data of an original shot point, and analyzing the seismic data to obtain the distribution rule of environmental noise; according to the distribution rule of the environmental noise, suppressing the abnormal interference noise in a shot domain environment through frequency division abnormal amplitude attenuation; performing ground surface consistency amplitude compensation after suppressing the abnormal interference noise to obtain amplitude compensation data in the shot domain environment; and according to the amplitude compensation data in the shot domain environment, suppressing abnormal interference noise in the CMP domain through frequency division abnormal attenuation by using an iterative processing mode, performing ground surface consistency amplitude compensation after each suppression, and obtaining a denoising processing result after completing the iterative processing. According to the data processing method and system for suppressing the extremely strong environmental noise, the environmental noise can be effectively suppressed, the signal-to-noise ratio of the data is obviously improved, and a high-quality data foundation is laid for pre-stack migration and pre-stack inversion work.

Description

technical field [0001] The invention belongs to the technical field of seismic data processing, in particular to a data processing method and system for suppressing extremely strong environmental noise. Background technique [0002] In recent years, the popularization and application of the acquisition method of vibroseis excitation and single-point geophone reception has greatly improved field production efficiency and reduced production costs. However, this acquisition method has a very limited ability to suppress noise. The extremely strong environmental noise has a negative impact on data processing and final results. [0003] Such as figure 1 As shown in , it is a typical original recorded pure wave display graph excited by a vibrator and received by a single-point geophone. From figure 1 It can be seen from the figure that, except for the near-shot array that can identify the first arrival and reflection, the far array is completely submerged in the strong energy an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V1/30G01V1/36
CPCG01V1/30G01V1/36
Inventor 康有元戴海涛张新立王婷婷王扶秀黄汉卿
Owner BC P INC CHINA NAT PETROLEUM CORP
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