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Method for identifying fault through seismic attributes

A seismic attribute and fault technology, which is applied in the field of seismic exploration, can solve the problems of attribute value difference, result distortion, poor comparability, etc., and achieve good recognition effect and strong anti-noise performance of attributes

Active Publication Date: 2014-02-12
BC P INC CHINA NAT PETROLEUM CORP +1
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Problems solved by technology

[0021] However, in the attribute body extracted by this method, there is a characteristic of poor comparability among attribute values. The attribute value is not only affected by the difference of seismic waveform, but also affected by the length of the coherence window when the waveform is completely similar.
Therefore, using the attributes extracted by this method for fault identification will lead to distorted results

Method used

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  • Method for identifying fault through seismic attributes

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Embodiment Construction

[0057] The present invention will be described in detail below in conjunction with the accompanying drawings.

[0058] The realization process of the present invention is as figure 1 As shown, the central black dot indicates the target track, and the surrounding black dots indicate the adjacent track. a-d is the combination mode of 4 adjacent 3 channels; g is the combination mode of 5 adjacent channels, and the combination of a and c is used for calculation; h is the combination mode of 9 adjacent channels, and the combination of a, c, e and f is used for calculation accomplish.

[0059] The technical scheme provided by the invention is as follows:

[0060] The application example uses the post-stack seismic data of a three-dimensional block. The faults in this block are well developed. There are both regional large faults and local small faults developed inside the salt dome. In some places, the dip angle of the formation is steep and the fault development is complicated. ...

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Abstract

The invention relates to a method for identifying a fault through seismic attributes. The number of adjacent seismic channels and a transverse combination mode of the seismic channels in standardized higher order statistics calculation are determined according to the signal-to-noise ratio of seismic data, a statistics time window is determined in a longitudinal time window, the time retardation of the adjacent seismic channels in the position with the maximum stratigraphic dip serves as a scan time window length, the standardized higher order statistics amount is calculated according to the number and the combination mode of the seismic channels, the statistics time window and the scan time window length, the statistics amount maximum value serves as an extraction attribute according to the transverse combination number and mode of the seismic channels, and time slicing and profile mapping are carried out to identify space distribution of the fault. The method for identifying the fault through seismic attributes has a higher suppressing function on random noise of the seismic data, and particularly suppresses discontinuous interference caused by the stratigraphic dip, the attribute noise resistance is high, and the effect of identifying the stratigraphic discontinuity caused by fracture systems is good.

Description

technical field [0001] The invention is a seismic exploration technology, specifically relates to a supporting technology for structural interpretation of seismic data, and is a method for identifying faults by using seismic attributes. Background technique [0002] The use of seismic attributes, such as coherent volume attributes, to identify faults has been proven and widely used. Currently, there are two methods for identifying faults using coherent volumes. [0003] 1) Standardized cross-correlation coefficient method. [0004] The standardized cross-correlation coefficient (Bahorich and Farmer, 1995) opened the way for the development of coherent technology, which improves the efficiency and reliability of fault interpretation, expressed as: [0005] ρx ( t , tlagx ) = Σ k = ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V1/28G01V1/36
Inventor 袁世洪万忠宏詹仕凡陈茂山
Owner BC P INC CHINA NAT PETROLEUM CORP
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