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Method for quantitatively analyzing earthquake crack attribute volume

A quantitative analysis, attribute volume technology, applied in seismic signal processing and other directions, can solve problems such as statistical fracture length, direction and spacing

Active Publication Date: 2014-05-07
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology

However, there is still no method to solve the problems of how to quantitatively analyze these attribute bodies with linear information, how to automatically count the length, direction and spacing of cracks, etc.

Method used

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  • Method for quantitatively analyzing earthquake crack attribute volume
  • Method for quantitatively analyzing earthquake crack attribute volume
  • Method for quantitatively analyzing earthquake crack attribute volume

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Embodiment Construction

[0026] Below in conjunction with accompanying drawing, the present invention is described in further detail:

[0027] The seismic attributes for fractures generally show a linear relationship on the plane (such as figure 1 As shown), the fracture data is discretized firstly by using the method of grid processing, the details are as follows: the fracture data are extracted from the seismic attribute map of seismic interpretation, and the seismic The attribute map is digitized. In the process of grid digitization, a threshold value a is set according to the gray value of the image. Those that are greater than the threshold value a are considered to be cracks, and those that are less than the threshold value a have no cracks. Finally, figure 2 . Then, pairwise cyclic comparisons are performed on each grid value, and the grid values ​​are all cracks (the value of the grid with cracks is set to 1, and the value of the grid without cracks is set to 0) to calculate the two grids. ...

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Abstract

The invention provides a method for quantitatively analyzing earthquake crack attribute volume and belongs to the field of geophysics interpretation. The method comprises performing gridding processing on the earthquake crack attribute volume in order to acquire plane grids and the value of each grid; calculating the distance and the azimuth angles of any two of grids equipped with cracks; performing statistic on all distance and azimuth angles on the plane grids in order to obtain a statistical result; projecting the statistical result on a two-dimensional array plane formed by the distance and the azimuth angles so as to obtain an analysis atlas reflecting crack space information. The method may automatically analyze crack data volume with linear characteristics and generate a vector atlas containing crack distribution information. Information of crack distribution angles, lengths, and spacing can be directly and easily acquired from the generated vector atlas.

Description

technical field [0001] The invention belongs to the field of geophysics interpretation, and in particular relates to a quantitative analysis method of seismic fracture attribute bodies. Background technique [0002] The development and distribution of reservoir fractures have an important impact on the exploration and development of oil and gas fields. To study the distribution and development of reservoir fractures is an important content of oilfield exploration and development. Usually oilfields and oil companies use seismic attribute interpretation method to predict reservoir fractures. At present, the technology of using seismic attribute volume to predict fractures in underground reservoirs is relatively mature. The existing seismic attribute analysis software can extract seismic attributes such as seismic coherence volume and ant volume from seismic data volume, and obtain fractures with linear characteristics. information, and then be able to describe and predict the...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V1/30
Inventor 索重辉吕公河杨勤勇叶勇周小慧
Owner CHINA PETROLEUM & CHEM CORP
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