Seismic phase and frequency correction method based on complex seismic trace decomposition and reconstruction

Abstract

The invention relates to a seismic phase and frequency correction method based on complex seismic trace decomposition and reconstruction. The method includes the following steps that first, according to an effective frequency band range recorded in known earthquakes, a subwave base traversing the effective frequency band range and a non-stationary convolution model are established; second, the subwave base is converted into complex numbers through Hilbert conversion, and a complex subwave base is established; third, the non-stationary convolution model is changed into the complex number form through the complex subwave base, complex reflection coefficients (please see the formula in the specification) are resolved through linear operation and sparse inversion constrained by L1 norm, the complex reflection coefficients (please see the formula in the specification) are substituted into the non-stationary convolution model in the complex number form, the real number part of the complex reflection coefficients is obtained, reconstruction on the seismic section is achieved, and according to the frequency of the seismic subwaves in the complex subwave base changed before reconstruction and obtained phase information in the complex reflection coefficients, frequency correction, phase correction and synchronous correction of frequency and phases on the original earthquake records are achieved. The method can be widely applied in the oil exploration process.

Description

technical field [0001] The invention relates to a seismic data processing method in the oil exploration process, in particular to a seismic phase and frequency correction method based on complex seismic trace decomposition and reconstruction. Background technique [0002] With the increasing degree of oil and gas exploration in my country, the exploration targets are gradually shifting to complex oil and gas reservoirs such as stratigraphy and lithology. This situation puts forward higher requirements for the accuracy of seismic interpretation. For this reason, scholars have worked hard to improve the resolution of seismic sections, broaden the seismic frequency band, increase interpretable information and develop new technologies to improve interpretation capabilities and interpretation. on the convenience. [0003] To facilitate seismic interpretation, seismic deconvolution techniques are usually used to improve the resolution of seismic sections. But the seismic signal ...

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Problems solved by technology

Usually, such frequency-divided stratigraphic profiles can only be obtained by frequency filtering or time-frequency decomposition for actual data, but the main frequency and phase of seismic events caused by different strata are different, so these two methods are important in selecting a narrow frequency band. There is a common problem in cross-section, that is, a lot of formation information carried by events that are not within the expected frequency band will be lost in the cross-frequency cross-section, and it is impossible to obtain a cross-frequency cross-section in the true sense

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