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Lithologic oil-gas reservoir weak-reflection seismic signal reconstruction method

A seismic signal, weak reflection technology, applied in seismic signal processing and other directions, can solve problems such as hindering the exploration and production of lithologic oil and gas reservoirs, and achieve the effect of convenient detection and identification, and improved resolution.

Inactive Publication Date: 2015-12-02
YANGTZE UNIVERSITY
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Problems solved by technology

The focus of oil and gas production has shifted from structural oil and gas reservoirs to lithologic oil and gas reservoirs, but the treatment methods for structural oil and gas reservoirs have not achieved good results when applied directly to lithologic oil and gas reservoirs, hindering the exploration and production of lithologic oil and gas reservoirs

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  • Lithologic oil-gas reservoir weak-reflection seismic signal reconstruction method
  • Lithologic oil-gas reservoir weak-reflection seismic signal reconstruction method
  • Lithologic oil-gas reservoir weak-reflection seismic signal reconstruction method

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[0016] In order to make the objectives, technical solutions and advantages of the present invention clearer, the present invention will be described in further detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention and are not intended to limit the invention.

[0017] A method for reconstructing weak reflection seismic signals of lithologic oil and gas reservoirs according to the present invention, the method for reconstructing weak reflection seismic signals comprises the following steps:

[0018] S1. Perform wavelet transform preprocessing and denoising on the original seismic signal;

[0019] S2. Perform waveform matching endpoint continuation processing on the denoised signal;

[0020] S3. Perform empirical mode decomposition on the seismic signal processed by end-point extension to obtain natural mode components that can reflect various...

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Abstract

The invention discloses a lithologic oil-gas reservoir weak-reflection seismic signal reconstruction method. According to the method, intrinsic mode components are obtained through carrying out wavelet denoising and waveform matching endpoint continuation processing on an original seismic signal respectively and decomposing the original seismic signal by adopting empirical mode decomposition, the effective intrinsic mode components are selected in a self-adaptive mode for Hilbert transformation by adopting correlation, an obtained instantaneous amplitude is subjected to self-adaptive spectral whitening processing, and the instantaneous amplitude after spectral whitening and an instantaneous phase obtained through Hilbert transformation are used for reconstructing a signal to obtain a reconstructed seismic signal with low noise and high energy. Compared with the original seismic signal, the reconstructed seismic signal increases the signal-to-noise ratio and the resolution ratio of seismic sections, and is more convenient to detect and identify.

Description

technical field [0001] The invention relates to a method for processing seismic signals, in particular to a method for reconstructing weak reflection seismic signals of lithological oil and gas reservoirs. Background technique [0002] With the increasing demand for oil and gas energy, the focus of oil and gas development has gradually shifted from structural oil and gas reservoirs to lithologic oil and gas reservoirs, which puts forward higher requirements for the seismic data processing technology of lithologic oil and gas reservoirs. Compared with common structural oil and gas reservoirs, most lithologic oil and gas reservoirs have dispersed reserves, thin layers, deep burial, and complex porosity and permeability conditions. The collected seismic data have the characteristics of weak signal reflection and high noise. Strong reflection seismic signals are easy to be processed and identified, but weak reflection seismic signals are difficult to process and identify. [00...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V1/28
Inventor 谢凯廖虎余秋哲其他发明人请求不公开姓名
Owner YANGTZE UNIVERSITY
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