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Wavelet transform-based high frequency continuation method

A wavelet transform and high-frequency technology, applied in the field of high-frequency continuation based on wavelet transform, can solve problems such as the inability to guarantee fidelity and signal-to-noise ratio, migration imaging and inversion, and the impact of reservoir description, etc., to achieve improved resolution The effect of high rate and high reliability

Inactive Publication Date: 2016-04-13
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology

[0005] In geophysical signal processing, conventional high-resolution processing methods based on convolution theory usually cannot guarantee the fidelity and signal-to-noise ratio after processing, which has a serious impact on migration imaging, inversion, and reservoir description

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  • Wavelet transform-based high frequency continuation method

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Embodiment Construction

[0046] Below in conjunction with accompanying drawing, the present invention is described in further detail:

[0047] The invention can effectively improve the resolution of pre-stack and post-stack data under the premise of protecting amplitude characteristics and signal-to-noise ratio, and provide high-quality basic data for high-resolution seismic imaging and fine reservoir interpretation.

[0048] The present invention provides a high-frequency continuation method for signal processing, and the specific implementation steps are:

[0049] (1) Classical wavelet transform

[0050] Let x(t) be a square-integrable function denoted as (x(t)∈L 2 (R)), is a function of the basic wavelet or mother wavelet (motherwavelet). but

[0051]

[0052] Called the wavelet transform of x(t). In the formula, a>0 is the scale factor, and τ is the reflection displacement, and its value can be positive or negative. The symbol represents the inner product, and its meaning is (the supers...

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Abstract

The invention provides a wavelet transform-based high frequency continuation method, and belongs to the field of digital signal processing of seismic exploration data processing. The method includes the steps of: (1) inputting seismic data channel by channel, and performing continuous wavelet transform on the seismic data, thereby decomposing the seismic data on different wavelet scales, and obtaining principal axis frequency; (2) performing continuation frequency band by frequency band according to octave: on each wavelet scale, performing frequency spectrum continuation on the principal axis frequency in a wavelet domain according to octave, thereby obtaining primary harmonic waves and a series of continuation harmonic waves; and (3) reconstructing seismic data: utilizing wavelet transform and inverse transform to reconstruct the primary harmonic waves and continuation harmonic waves, thereby obtaining seismic data after high frequency continuation.

Description

technical field [0001] The invention belongs to the field of digital signal processing such as seismic exploration data processing, and in particular relates to a high-frequency continuation method based on wavelet transform. Background technique [0002] Severe absorption attenuation and low seismic data resolution are prominent problems in oil and gas exploration in sand dunes in western China and clastic rock exploration areas in southwest my country. Conventional high-resolution processing methods based on convolution theory usually cannot guarantee the fidelity and signal-to-noise ratio after processing. Therefore, it is very important to effectively improve the resolution of pre-stack and post-stack data under the premise of protecting the amplitude characteristics and signal-to-noise ratio, which can provide high-quality basic data for high-resolution seismic imaging and fine reservoir interpretation. [0003] At present, the development trend of high-resolution proc...

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Application Information

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IPC IPC(8): G01V1/30G01V1/28G06F19/00
Inventor 谢金娥段心标孙晶梅
Owner CHINA PETROLEUM & CHEM CORP
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