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Method for automatically picking up seismic reflection event based on Kalman filtering

A Kalman filter and seismic reflection technology, applied in the field of seismic exploration signal processing, can solve problems such as difficulty in picking up multiple events at the same time, less combination of seismic wave motion laws, etc.

Inactive Publication Date: 2013-06-12
BEIJING INSTITUTE OF TECHNOLOGYGY
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Problems solved by technology

[0004] To sum up, so far, many achievements have been made in the event picking technology of seismic records at home and abroad, but most of the methods are less integrated with the motion laws of seismic waves, and it is difficult to pick up multiple events at the same time.

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  • Method for automatically picking up seismic reflection event based on Kalman filtering
  • Method for automatically picking up seismic reflection event based on Kalman filtering
  • Method for automatically picking up seismic reflection event based on Kalman filtering

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Embodiment Construction

[0037] The technical solution of the present invention will be further explained below in conjunction with the accompanying drawings and a specific embodiment.

[0038] Firstly, according to the parameters shown in Table 1, a seismic reflection record of two events with a total number of 64 traces is synthesized, as shown in figure 2 As shown, the records in the figure are superimposed with a mean of zero and a variance of σ 2 =0.05W Gaussian white noise, it can be seen that strong noise covers the event, making it difficult to identify the event.

[0039] Table 1 Parameters used for synthetic recording

[0040]

[0041] The following are the specific implementation steps of using the proposed method to automatically pick up two events:

[0042] Step S00, initialization. Set the set of free measurement points and the set of event axes to be empty, and the number of iteration steps k=1.

[0043] Step S01, extract the seismic signal of the kth channel in the 64 seismic r...

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Abstract

The invention discloses a method for automatically picking up a seismic reflection event based on Kalman filtering. According to the scheme, the method comprises the following steps of: establishing a state equation and a measurement equation of a Kalman filtering system for picking up seismic reflection event information on the basis of a seismic reflection hyperbolic time-distance equation according to movement rules of seismic reflection waves; detecting the time of arrival of seismic wavelets in each seismic signal, thereby obtaining measurement data for Kalman filtering; and automatically initiating the event according to data in a free measurement point set, and performing gradual iterative filtering according to a sequence of prediction, observation and correction. A data association technology is used for solving the problem of simultaneous tracking of a plurality of events.

Description

technical field [0001] The invention belongs to the technical field of seismic exploration signal processing, and in particular relates to the technology of automatically picking up seismic reflection events. Background technique [0002] Since the Kalman filter method was proposed in the early 1960s, it has been widely used in target tracking, navigation, power system, medicine, automatic control, meteorology, communication, seismic exploration and other fields. In the field of seismic exploration, Kalman filtering is mainly used for deconvolution of seismic data to improve the resolution and signal-to-noise ratio of seismic exploration signals. Most of the information carried in the seismic signal is basically contained in the event, such as: the self-excitation and self-retraction time t of the event 0 To a certain extent, it reflects the depth information of the interface, the shape of the event reflects the propagation velocity information of the seismic wave in the me...

Claims

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Application Information

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IPC IPC(8): G01V1/28
Inventor 邓小英曾涛刘海波毕锐锐
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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