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Method for enhancing resolution of seismic section through compensating variable resolution factor S transform complex time-frequency spectrum

A technology of seismic section and resolution, applied in seismic signal processing and other directions

Inactive Publication Date: 2015-09-23
NORTHWESTERN POLYTECHNICAL UNIV +2
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Problems solved by technology

Inverse Q filtering can compensate the signal in terms of frequency, amplitude, phase, etc. Its shortcoming needs to know the accuracy Q value

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  • Method for enhancing resolution of seismic section through compensating variable resolution factor S transform complex time-frequency spectrum
  • Method for enhancing resolution of seismic section through compensating variable resolution factor S transform complex time-frequency spectrum
  • Method for enhancing resolution of seismic section through compensating variable resolution factor S transform complex time-frequency spectrum

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Embodiment Construction

[0064] Now in conjunction with embodiment, accompanying drawing, the present invention will be further described:

[0065] The invention provides the following technical solutions, the method compensates the high-frequency energy absorbed by the earth for seismic signals, so as to achieve the purpose of improving the resolution of seismic signals. Reasonable compensation must understand the variation law of seismic signal absorption and attenuation. Due to the complexity of the underground structure and the differences in acquisition and processing methods of exploration seismic data, the present invention adopts a statistical method to obtain the technical solution of the law of variation of seismic signal energy with frequency attenuation. The implementation method is as follows:

[0066] 1) FFT is performed on each seismic trace in the seismic section to obtain the amplitude spectrum of the seismic trace;

[0067] 2) Accumulate and average the amplitude spectra of all sei...

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Abstract

The invention relates to a method for enhancing resolution of a seismic section through compensating variable resolution factor S transform complex time-frequency spectrum. Firstly an amplitude spectrum attenuation function changing with frequency is obtained by fitting through mean amplitude spectrum of the seismic section so that a time-frequency spectrum compensation factor and a compensation function are constructed. Then the time-frequency spectrum is adjusted by the compensation function. Finally, a seismic signal is reconstructed through S inverse transform so that an objective of enhancing resolution of the seismic signal is realized. According to the method, a Q factor does not need to be calculated, and the method is different from other methods for enhancing resolution of the seismic signal, such as inverse Q filtering and other deconvolution algorithms. The algorithm has fidelity and a great resolution enhancement function.

Description

technical field [0001] The invention belongs to the fields of geophysics and oil and gas seismic exploration and development, and relates to a method for improving the resolution of seismic sections by compensating the complex time-frequency spectrum transformed by the variable resolution factor S of seismic traces. Background technique [0002] In oil and gas exploration, high-resolution seismic data are required for fine description of reservoirs and geological structures. However, due to the viscosity of the earth formation medium, the seismic wave is absorbed and dispersed by the ground when it propagates underground, which relatively reduces the energy of the high frequency part of the seismic wave, resulting in a decrease in the resolution of the seismic signal. [0003] Researchers have proposed various methods for improving the resolution of seismic signals from surveys. In the early stage, based on the simple convolution model, assuming that the seismic data is a s...

Claims

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Application Information

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IPC IPC(8): G01V1/36
Inventor 姬战怀严胜刚张莲叶
Owner NORTHWESTERN POLYTECHNICAL UNIV
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