Method for carrying out gas containing performance detection by use of earthquake instantaneous center of mass frequency

Abstract

The invention relates to the field of natural gas geophysical exploration and provides a method for extracting the earthquake instantaneous center of mass frequency by use of earthquake data so as to reliably indicating natural gas existence by use of the earthquake instantaneous center of mass frequency. The method comprises steps of (1), precisely calibrating a target layer by comprehensively using data like geology, logging and synthesized earthquake records; (2) by use of the CEEMD-based on earthquake instantaneous center of mass frequency method, open a time window along the target layer and extracting attributes of the earthquake instantaneous center of mass frequency; and (3) by use of the attributes of the earthquake instantaneous center of mass frequency, determining gas containing performance of the target layer. According to the invention, quite high space-time resolution is achieved for the gas containing performance result; and meanwhile, conditions are avoided that a few of frequency division profiles are required for analysis and the hydro carbons explaining is then performed by use of the optimal frequency division profile in the conventional spectral decomposition method based on the short-term Fourier analysis and wavelet transformation.

Description

technical field [0001] The invention relates to the field of natural gas geophysical exploration, and is a method of extracting the instantaneous centroid frequency of seismic waves by using seismic data, and then reliably indicating the existence of natural gas by using the instantaneous centroid frequency of seismic waves. Background technique [0002] In natural gas exploration, how to extract more useful information from the instantaneous attributes of seismic signals, especially the use of frequency anomaly information, combined with geological, logging and other data, to find meaningful natural gas reservoir belts is an important issue for petroleum geophysical researchers. The pursuit of the goal all the time is also a difficult problem. Fluid-bearing rock formations will cause energy loss of seismic waves during propagation, and the energy of seismic waves will attenuate significantly at high frequencies in the interior and lower parts of gas-bearing layers. Spectru...

AI Technical Summary

Problems solved by technology

Although the gas-containing detection technology based on the EMD time-frequency analysis method has better time-space resolution and accuracy than the gas-containing detection technology based on the traditional time-frequency analysis method, there are problems such as modal aliasing effect in the EMD method itself. , will cause the IMF decomposed by EMD to lack physical meaning and geological meaning, thus reducing the accuracy of gas-bearing property detection

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