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A Characterization Method of Amplitude Transversal Variation Based on Principal Component Analysis

A principal component analysis, lateral technology, used in measurement devices, geophysical measurements, seismology, etc., can solve problems such as noise resistance deterioration

Active Publication Date: 2021-05-14
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology

[0004] However, the main problem of the above-mentioned methods is that the noise immunity is deteriorated due to the sensitivity of the derivation operation to noise.

Method used

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  • A Characterization Method of Amplitude Transversal Variation Based on Principal Component Analysis
  • A Characterization Method of Amplitude Transversal Variation Based on Principal Component Analysis
  • A Characterization Method of Amplitude Transversal Variation Based on Principal Component Analysis

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Embodiment

[0059] Such as figure 1 As shown, it is a flowchart of a method for describing amplitude lateral variation based on principal component analysis in the present invention, including the following steps:

[0060] Step 1: Input 3D post-stack seismic data and corresponding 3D apparent dip data;

[0061] Step 2: Filtering and preprocessing the 3D post-stack seismic data can improve the signal-to-noise ratio;

[0062] Step 3: After filtering and preprocessing, the 3D post-stack seismic data is obtained by Hilbert transform to obtain complex seismic traces, and the instantaneous amplitude is calculated;

[0063] Step 4: Calculate the partial derivative of the instantaneous amplitude along the 3D apparent dip angle data for the 3D post-stack seismic data after filtering and preprocessing;

[0064] Step 5: Use the instantaneous amplitude partial derivative to construct the covariance matrix and perform eigendecomposition to obtain the main eigenvalue and main eigenvector;

[0065] S...

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Abstract

The invention relates to a method for describing the lateral variation of amplitude based on principal component analysis. The invention aims at the problem of anti-noise when describing the variation of the amplitude along the layer. The instantaneous amplitude is obtained by using the Hilbert transform, and the instantaneous The spatial partial derivative of the amplitude, and then use the spatial partial derivative of the instantaneous amplitude to construct the covariance matrix, and then use the principal component analysis to extract the principal component, and finally use the stable estimation of the instantaneous amplitude derivative of the principal component along the apparent dip angle, which can be used to stably describe the amplitude lateral Variety. The invention has the characteristics of being less affected by structures and having good noise resistance, and has good application prospects in the aspects of cost saving of three-dimensional post-stack seismic data, improvement of seismic data interpretation and the like.

Description

technical field [0001] The invention belongs to the technical field of seismic data interpretation of geophysical exploration, and in particular relates to a method for describing lateral variation of amplitude based on principal component analysis. Background technique [0002] Amplitude attributes are closely related to the difference in wave impedance at the reflection interface, and can be used for lithology, hydrocarbon detection, etc. The lateral variation of the amplitude (the first derivative of the amplitude and the newly proposed amplitude curvature attribute) can be used not only to detect the boundaries of geological bodies, but also to detect the lateral heterogeneity of the formation (such as the lateral variation of formation porosity and lithology, etc. ), explain thin layer tuning, etc. Therefore, the lateral variation of amplitude plays an important role in oil and gas exploration and development. [0003] Laplacian filters, widely used for image edge dete...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01V1/30
CPCG01V1/307G01V2210/632
Inventor 霍志周刘喜武张金强王晓凯陈文超
Owner CHINA PETROLEUM & CHEM CORP
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