Phase-criterion-based identification and extraction method of physical detection echo signal

Abstract

The invention relates to a phase-criterion-based identification and extraction method of a physical detection echo signal. The method comprises: (1), carrying out Hilbert transform on an echo signal to obtain a corresponding parsing signal; (2), according to corresponding parsing, obtaining an instantaneous value of a phase theta (t); (3), carrying out phase compensation on instantaneous phase information of the signal and extracting preliminary abnormity; and (4), carrying out wavelet transform on a signal extracted by the preliminary abnormity and extracting abnormal information in an original waveform accurately. According to the method provided by the invention, echo information from the deep place of the stratum can be picked up accurately under the condition of the same source energy. Moreover, echo information of a weak reflection layer can be extracted accurately and echo information of the top surface and bottom surface of the thin layer can be separated and extracted accurately. Meanwhile, the aftershock can be suppressed effectively and the multiple influence can be reduced.

Description

Technical field [0001] The invention relates to the identification and extraction of physical detection echo signals, in particular to a physical detection echo signal identification and extraction method based on a phase criterion. Background technique [0002] At present, with the continuous improvement of the degree of seismic exploration, exploration objects are becoming more and more complex and concealed. For example, reservoirs with deep buried depth, small area, and thin thickness often correspond to weak reflections or even no reflections on conventional seismic profiles, and the signal of the target body is basically blocked. Overwhelmed by strong background signal. Especially for river sand bodies, thin reservoirs and deep targets, the reflection signals generated are weak. Therefore, it is necessary to carry out processing and prediction work for weak seismic reflection signals to improve the prediction accuracy of weak signal exploration targets, so as to meet the e...

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Problems solved by technology

However, this method has the following limitations: First, the seismic wave attenuates quickly when propagating in the underground medium. When the signal-to-noise ratio is <<1, the event is difficult to identify, and this method will fail; second, the echo signal is affected by aftershocks. The impact is very serious; third, it is difficult to identify the echo signal of the thin layer; fourth, it is difficult to identify the echo signal of the weak reflection layer

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