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Wavelet sidelobe information-based oil reservoir identification method

An identification method and oil reservoir technology, applied in the direction of seismic signal processing, etc., can solve the problems of difficult identification of oil reservoirs, large impedance differences, etc., and achieve the effect of accurate identification

Active Publication Date: 2015-10-07
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology

[0005] The purpose of the present invention is to provide a reservoir identification method based on subwave sidelobe information to solve the problem that the reservoir is difficult to identify due to the large difference in wave impedance between the upper and lower formations

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  • Wavelet sidelobe information-based oil reservoir identification method
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  • Wavelet sidelobe information-based oil reservoir identification method

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Embodiment Construction

[0028] The specific embodiments of the present invention will be further described below in conjunction with the accompanying drawings.

[0029] The following takes the 3D seismic data of a work area as an example to illustrate. The work area of ​​the 3D seismic data in this work area is 5.6km 2 , before applying the proposed method of identifying oil reservoirs using sub-waveside lobe information to the work area, exploration well A1 has been drilled, and oil reservoirs were found in sandstone reservoirs above tuff in well A1. The wave impedance of the upper and lower formations on the top of the tuff in this work area is very different, so that a very strong seismic reflection event is formed on the top of the tuff; because the sandstone reservoir deposited on the top of the tuff is thin, the seismic reflection formed by the sandstone reservoir is very weak , and hidden in the strong reflection event of the trough on the top of the tuff, the previous reservoir identification...

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Abstract

The invention relates to a wavelet sidelobe information-based oil reservoir identification method, and belongs to the technical field of petroleum exploration and development. The method generates a synthetic seismogram through logging data and theoretical wavelet convolution, determines a relation between depth and time, and then calculates to generate a certainty wavelet; and establishes three wave impedance models of an oil layer, a water layer and anon-reservoir layer, generates a reflection waveform of forward modeling with certainty wavelet convolution, compares and analyzes an amplitude difference situation of three reflected wave events near an oil reservoir, and determines the reflected wave with the maximum amplitude change percentage of the reflected wave event, and the amplitude of the reflected wave event is formed due to a sidelobe effect of reflected waves of a top interface of the oil reservoir; and the event that reflects oil reservoir reflected wave sidelobe information is tracked in seismic data, a seismic amplitude value is extracted along a seismic interpretation layer, and an area with relatively strong amplitude is selected as an identified oil reservoir area. The wavelet sidelobe information-based oil reservoir identification method provided by the invention is simple and practical, and can accurately identify an oil reservoir whose wave impedance of upper and lower strata has large difference.

Description

technical field [0001] The invention relates to an oil reservoir identification method based on subwave side lobe information, and belongs to the technical field of petroleum exploration and development. Background technique [0002] In the process of formation deposition, some reservoirs with pinch-out characteristics are often formed. If the overburden is in good condition, structural traps can be formed. When oil and gas migrate to this time, oil reservoirs can be formed. However, when a strong wave impedance interface is close to the bottom of the reservoir, a very strong seismic reflection wave will be formed near the reservoir, and the reflection wave of the reservoir is interfered by this strong reflection wave, and the waveform characteristics become difficult. Identification, it is difficult to identify the distribution range of oil reservoirs using existing technical methods. [0003] The patent "Thin Lithology Reservoir Identification and Horizontal Drilling Trac...

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Application Information

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IPC IPC(8): G01V1/30
Inventor 黎腾李俨岳欣欣王鹏飞李秋菊刘焕邢丽娟李瑜玲
Owner CHINA PETROLEUM & CHEM CORP
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