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Fracture-cave development zone detection method based on iterated three-parameter wavelet transformation

A wavelet transform and detection method technology, applied in the field of oil and gas geophysical exploration and detection, can solve problems such as poor matching of seismic data

Active Publication Date: 2014-11-26
BC P INC CHINA NAT PETROLEUM CORP +1
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Problems solved by technology

The present invention uses three-parameter wavelet transform instead of conventional wavelet transform for calculation, overcomes the defect of poor matching of seismic data in the prior art, and improves the accuracy of edge detection

Method used

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Embodiment Construction

[0047] The present invention is to provide a method for detecting fracture-vug development zones based on iterative three-parameter wavelet transform, which processes two-dimensional seismic slices for identification of fracture-vug development zones and effectively guides reservoir prediction for oil and gas geophysical exploration .

[0048] The present invention can achieve following purpose:

[0049] (1) The three-parameter wavelet transform is used instead of the conventional wavelet transform for calculation, which overcomes the defect of poor matching of seismic data in the existing technology;

[0050] (2) Simultaneously perform edge detection processing on the horizontal and vertical of the 2-dimensional seismic slice, and use the root mean square of the horizontal and vertical edge detection results as the final edge detection result to improve the accuracy of edge detection in the prior art;

[0051] (3) To further improve the accuracy of edge detection in the prio...

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Abstract

The invention discloses a fracture-cave development zone detection method based on iterated three-parameter wavelet transformation. The fracture-cave development zone detection method comprises the steps that calculation is conducted by replacing conventional wavelet transformation with three-parameter wavelet transformation, edge detection is conducted in the transverse direction and in the longitudinal direction of a two-dimensional earthquake slice at the same time, a root mean square of a transverse edge detection result and a longitudinal edge detection result is used as the final edge detection result, then wavelet transformation is conducted twice, edge-preserving smoothing is conducted on a result array of wavelet transformation, a final result array used for edge detection is obtained, and the result array is used for describing the development zone of a fracture-cave body. According to the fracture-cave development zone detection method based on iterated three-parameter wavelet transformation, calculation is conducted by replacing conventional wavelet transformation with three-parameter wavelet transformation, the defect that the seismic data matching performance is poor in the prior art is overcome, and the edge detection precision is improved.

Description

technical field [0001] The invention relates to a detection method for oil and gas geophysical exploration, in particular to a detection method for fracture-vug development zones based on iterative three-parameter wavelet transform. Background technique [0002] In the field of oil and gas geophysical exploration, edge detection methods are mainly used to find fracture-cave development zones, which are often favorable oil and gas storage spaces or migration channels. [0003] Pores, cracks (cracks) and dissolved pores are ubiquitous in rocks or rock formations in nature, and their shapes and scales are also very different. For seismic exploration, due to the limitation of resolution, it is impossible to identify individual pores, holes, and fractures, and only fracture development zones with a certain scale can be identified. In fact, individual pores, caves, and fractures play little role in the accumulation of oil and gas, and the real exploration and development value is...

Claims

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Application Information

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IPC IPC(8): G01V1/28G01V1/30
Inventor 徐明华刘俊海欧阳诚吴大奎陈琴
Owner BC P INC CHINA NAT PETROLEUM CORP
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