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Viterbi-BMC algorithm automatic speed analysis method

A technology of velocity analysis and dynamic correction velocity, which is applied in seismic signal processing and other directions, and can solve problems such as failure of large array seismic data

Inactive Publication Date: 2015-09-23
CHENGDU UNIVERSITY OF TECHNOLOGY
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Problems solved by technology

[0007] The purpose of the present invention is to provide an automatic velocity analysis method of the Viterbi-BMC algorithm, which solves the problem that the current conventional velocity analysis fails for large array seismic data

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Embodiment Construction

[0075] The present invention will be described in detail below in combination with specific embodiments.

[0076] The present invention is a set of pre-stack processing algorithm scheme based on the theory of anisotropic medium, which performs non-hyperbolic velocity analysis on large-arranged CMP (CDP) seismic data to form Vnmo spectrum and η spectrum, and then adopts viterbi automatic picking optimization algorithm, Pick up the v-t curve, and use the BMS dynamic correction method to perform dynamic correction processing.

[0077] like figure 1 Shown is the flow of steps of the method of the present invention. figure 2 It is a technical flow chart based on the non-hyperbolic velocity analysis of the Akhalif time-distance curve.

[0078] Bispectral non-hyperbolic velocity analysis

[0079] 1. Principle

[0080] Use Akhalifah non-hyperbolic time difference analysis formula as the basis of anisotropic non-hyperbolic velocity, as follows:

[0081] t ...

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Abstract

The invention discloses a Viterbi-BMC algorithm automatic speed analysis method. The method comprises the steps that under a certain t0, a short arrangement CMP gather is used; regular speed analysis is carried out to acquire an initial dynamic correction speed Vnmo; Vnmo and t0 are put into a non-hyperbolic time difference formula; large arrangement seismic data are scanned to acquire an initial eta value, and the eta value is put into the non-hyperbolic time difference formula; the large arrangement seismic data are scanned, and the dynamic correction speed Vnmo is redefined; repeated iteration is carried out on Vnmo and eta two to three times to acquire stable Vnmo and eta; a next t0 is scanned; a previous iteration process is carried out until all t0s are scanned; and a speed Vnmo spectrum and an eta spectrum are output. The Viterbi-BMC algorithm automatic speed analysis method provided by the invention has the advantages that the large arrangement seismic data are processed and a processing result is accurate.

Description

technical field [0001] The invention belongs to the technical field of seismic measurement, and relates to an automatic velocity analysis method of a Viterbi-BMC algorithm. Background technique [0002] In exploration seismology, velocity information is a very important parameter, which not only acts as a bridge between seismic, well logging, and petrophysical properties, but also is the cornerstone of the entire seismic data processing (NMO, DMO, migration, time-depth conversion, etc.). Velocity analysis has the following three functions: a. It mainly provides stacking velocity, thereby improving the signal-to-noise ratio and resolution of the stacking section; b. Provides velocity field information for migration, time-depth conversion, VVAZ, etc.; c. Provides lithology The division improves reliable velocity information. [0003] Since Dix (1955) proposed the hyperbolic moveout formula based on conventionally reflected P waves in isotropic media, this theory has been wid...

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Application Information

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IPC IPC(8): G01V1/30G01V1/36
Inventor 李勇范欣然丁昭恒何剑赵炜捷罗鹏曦龙姣
Owner CHENGDU UNIVERSITY OF TECHNOLOGY
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