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A method for identifying faults using seismic attributes

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

Active Publication Date: 2016-06-08
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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  • A method for identifying faults using seismic attributes
  • A method for identifying faults using seismic attributes
  • A method for identifying faults using 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 present invention uses seismic attributes to identify faults. According to the signal-to-noise ratio of seismic data, the number of adjacent seismic traces and the lateral combination mode of seismic traces in the calculation of standardized high-order statistics are determined, and the statistical time window is determined in the longitudinal time window. The time delay of the adjacent seismic traces at the maximum formation dip is taken as the length of the scanning window, and the standardized high-order statistics are calculated according to the number of seismic traces and combination mode, the statistical time window and the length of the scanning time window. The maximum value of statistics is used as the extracted attribute, and time slice and profile mapping are performed to identify the spatial distribution of faults. The invention has a strong suppressing effect on the random noise of seismic data, especially suppresses the discontinuity interference caused by the dip angle of the stratum, has strong property anti-noise performance, and has a good recognition effect on the discontinuity characteristic of the stratum caused by the fault system.

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 and improved 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 Patents(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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