Automatic extraction method for three-dimensional earthquake fault

An automatic extraction, three-dimensional seismic technology, applied in the field of seismic exploration, can solve problems such as difficulty, subjectivity, and long period, and achieve the effect of overcoming long period.

CN103412331AInactive Publication Date: 2013-11-27UNIV OF ELECTRONICS SCI & TECH OF CHINA
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2013-11-27
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention discloses an automatic extraction method for a three-dimensional earthquake fault. The method comprises the following steps that data is subjected to image division based on ant tracking data to obtain a binary, then initial clustering is carried out on a fault by utilizing the space grid distance property of fault data points, further classification is carried out on the fault obtained from the initial clustering by utilizing the dip angle property of the fault, finally fault surfaces which are mutually independent and uncrossed are obtained, and the purpose of extracting fault surfaces out of ant tracking data is reached. By adopting the method, automatic identification and explanation on fault surfaces can be carried out, important and great experimental significance on directly explaining an earthquake fault is provided, support can be provided for an exploration worker on researching earthquake data further, and the defects of long period, great difficulty and strong subjectivity in the current method are overcome.
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Description

technical field

[0001] The invention relates to the field of seismic exploration, in particular to a method for automatically extracting three-dimensional seismic faults. Background technique

[0002] In seismic exploration, seismic data interpretation is a very important link, and faults are one of the core parts of seismic data interpretation. The so-called fault is a structure in which the crustal rock layer is ruptured due to the force reaching a certain strength, and there is obvious relative movement along the rupture surface.

[0003] Conventional fault interpretation methods use manual interpretation methods. Interpreters manually interpret faults on vertical sections and horizontal slices of 3D seismic data, usually along the main survey line or choose any survey line perpendicular to the fault strike line by line. Fault, and then control the spatial contrast and extension of the fault through horizontal or layer slices. This method has a long cycle, great difficul...

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Embodiment Construction

[0025] Embodiments of the present invention will be further described below in conjunction with the accompanying drawings.

[0026] The present invention uses coherent volume data as an intermediate carrier to design a set of three-dimensional seismic fault interpretation process, and proposes a method for extracting three-dimensional seismic faults from "ant body" data based on spatial grid distance and section dip angle attributes. Since the original data is distributed in the spatial grid, the method based on the spatial grid distance adopted by the present invention is more convenient and efficient than the general tracking method based on the spatial Euclidean distance. The complete process of extracting seismic fault planes from seismic amplitude volume data is as follows: figure 1 shown.

[0027] The amplitude volume data obtained by seismic exploration is not the data we need, we need to use the ant colony algorithm [15] First convert it into "ant body" data. After ...