Compression method and device of multidimensional nuclear magnetic resonance (nmr) logging data

A technology of nuclear magnetic resonance and logging data, applied in the field of oil and gas exploration, can solve the problems of low compression rate and slow inversion speed of multi-dimensional nuclear magnetic resonance logging data, etc., achieve high compression rate, increase inversion speed, and small amount of calculation Effect

Active Publication Date: 2018-08-17
CHINA UNIV OF PETROLEUM (BEIJING)
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Problems solved by technology

[0005] The present invention provides a compression processing method and device for multidimensional nuclear magnetic resonance logging data, which are used to solve the problems of low compression rate of compressed multidimensional nuclear magnetic resonance logging data and slow inversion speed of compressed multidimensional nuclear magnetic resonance logging data

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  • Compression method and device of multidimensional nuclear magnetic resonance (nmr) logging data
  • Compression method and device of multidimensional nuclear magnetic resonance (nmr) logging data
  • Compression method and device of multidimensional nuclear magnetic resonance (nmr) logging data

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[0043] Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, the same numerals in different drawings refer to the same or similar elements unless otherwise indicated. The implementations described in the following exemplary examples do not represent all implementations consistent with the present disclosure. Rather, they are merely examples of apparatuses and methods consistent with aspects of the present disclosure as recited in the appended claims.

[0044] The specific application scenarios of the present invention are as follows. The invention relates to the technical field of logging data processing in oil and gas exploration. In oil and gas exploration, it is necessary to use nuclear magnetic resonance devices to measure oil wells or formations, that is, the process of nuclear magnetic resonance logging, in order to obtain mul...

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Abstract

The invention provides a compression method and device of multidimensional nmr logging data. The method comprises that multidimensional nmr echo string data and a multidimensional nmr logging kernel matrix are obtained; a window-averaging method is used to compress the echo string data and the kernel matrix preliminarily; one-dimensional discrete cosine transform is carried out on the preliminarily compressed echo string data to obtain a first discrete cosine transform coefficient and first low-frequency data; two-dimensional discrete cosine transform is carried out on the preliminarily compressed kernel matrix to obtain a second discrete cosine transform coefficient and second low-frequency data; and one-dimensional discrete cosine inverse transformation is carried out on the first low frequency data, two-dimensional discrete cosine inverse transformation is carried out on the second low frequency data, and compressed multi-dimensional nmr logging data is obtained. The compression method is high in compression ratio, the computational complexity of an inversion process of the nmr logging data is reduced, and the inversion speed is improved.

Description

technical field [0001] The invention relates to the technical field of oil and gas exploration, in particular to a compression processing method and device for multi-dimensional nuclear magnetic resonance logging data. Background technique [0002] In oil and gas exploration, it is necessary to use nuclear magnetic resonance logging instruments to measure oil wells or formations to obtain reservoir pore fluid information. Multi-dimensional NMR logging, such as 2D NMR logging or 3D NMR logging, can simultaneously measure the lateral relaxation time T2, longitudinal relaxation time T1 and fluid diffusion coefficient D of reservoir pore fluids, which can be used in reservoir evaluation It is obviously better than one-dimensional nuclear magnetic resonance logging, but the amount of multi-dimensional nuclear magnetic resonance logging data is huge, and the inversion calculation of multi-dimensional nuclear magnetic resonance logging data directly is very large, which affects the...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T9/00
CPCG06T9/007G06T2207/10088
Inventor 谢然红谷明宣郭江峰金国文高伦
Owner CHINA UNIV OF PETROLEUM (BEIJING)
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