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Coal bed gas prediction method based on frequency attenuation

A technology of frequency attenuation and prediction method, applied in the direction of seismic signal processing, etc., can solve the problems of blindness and untargetedness of coalbed methane

Inactive Publication Date: 2014-12-24
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology

Direct use of gas-bearing prediction technology for conventional oil and gas reservoirs in coalbed methane prediction research is blind and untargeted

Method used

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  • Coal bed gas prediction method based on frequency attenuation
  • Coal bed gas prediction method based on frequency attenuation
  • Coal bed gas prediction method based on frequency attenuation

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Embodiment Construction

[0039] Below in conjunction with accompanying drawing, the present invention is described in further detail:

[0040] Conventional seismic processing data has low main frequency and narrow frequency band, and the resolution of coalbed methane prediction is low. The present invention uses pulse deconvolution frequency raising technology to process seismic data, the main frequency is raised to about 50 Hz, and the frequency band width is also increased. The seismic data after the frequency increase is beneficial to the research on CBM prediction technology based on frequency attenuation. The difference in seismic wave energy before and after attenuation is large, and the prediction effect is obvious.

[0041] Theoretical research shows that when the seismic wave passes through the oil and gas reservoir, the absorption and attenuation of high frequency energy will occur, so that the characteristics of the seismic wave are shown as the decrease of high frequency energy and the re...

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Abstract

The invention provides a coal bed gas prediction method based on frequency attenuation, and belongs to the field of seismic exploration and development of oil gas and coal bed gas. The coal bed gas prediction method comprises the steps that (1) seismic data x(t) are input; (2) pulse deconvolution frequency increase processing is conducted on the seismic data x(t), and a seismic record S(t) after frequency increase is obtained; (3) wavelet transformation spectral decomposition is conducted on the seismic record S(t) obtained after the frequency increase, and frequency spectra at the top and the bottom of a coal bed are obtained; (4) the difference value between the frequency spectra at the top and the bottom of the coal bed is obtained, contrastive analysis is conducted on the coal bed and the difference between the frequency spectra, and a frequency attenuation result of the coal reservoir is obtained; (5) the frequency attenuation result of the coal reservoir is output. According to the coal bed gas prediction method based on frequency attenuation, the pulse deconvolution frequency increase technology is applied, so that dominant frequency of the seismic data is effectively increased, an effective frequency band is broadened, and a data guarantee is provided for analysis of seismic wave frequency absorption attenuation features.

Description

technical field [0001] The invention belongs to the field of seismic exploration and development of oil and gas and coalbed methane, in particular to a coalbed methane prediction method based on frequency attenuation, which is used for comprehensive prediction research on the gas-bearing properties of favorable coalbed methane reservoirs. Background technique [0002] The study of scattering theory shows that the energy attenuation of seismic wave will occur when the seismic wave passes through the oil and gas formation, which involves the friction of the formation on the seismic wave and the energy absorption of the seismic wave by the oil and gas in the formation. Experiments have proved that the energy attenuation of seismic waves increases with the increase of seismic wave propagation distance, and the energy attenuation of seismic waves caused by oil and gas reservoirs shows that high-frequency energy attenuates quickly and low-frequency energy attenuates slowly, resulti...

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Application Information

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IPC IPC(8): G01V1/30
Inventor 陈勇关达袁联生刘玉琦孙振涛杨江峰徐佳冉琦
Owner CHINA PETROLEUM & CHEM CORP
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