Data quality analysis-based signal to noise ratio controllable earthquake frequency-expansion processing method

Abstract

The invention discloses a data quality analysis-based signal to noise ratio controllable earthquake frequency-expansion processing method. A generalized S transformation time frequency analysis method is adopted for subjecting earthquake data to time frequency decomposition; amplitude preservation of each time frequency component is analyzed and evaluated via well-to-seismic integration, correction factors are calculated via amplitude preservation difference of different time frequency components, the correction factors of each time frequency component are smoothed in time and space scopes, the smoothed correction factors of each time frequency component are used for correcting a corresponding time frequency component, frequency energy can be compensated, signal to noise ratio constraint conditions are specified, and earthquake data is reconstructed under the specified signal to noise ratio constraint conditions. Via the data quality analysis-based signal to noise ratio controllable earthquake frequency-expansion processing method, amplitude preservation of an original earthquake cannot be lowered via frequency expansion operation, and an earthquake frequency band can be widened to a maximum degree under the specified signal to noise ratio conditions.

Description

technical field [0001] The invention belongs to the field of petroleum and natural gas exploration and development, and in particular relates to a seismic frequency extension processing method with controllable signal-to-noise ratio based on data quality analysis. Background technique [0002] Seismic frequency extension technology is to broaden the seismic effective frequency band by performing mathematical operations on seismic data, and restore the reflected energy of the low frequency band and high frequency band of the earthquake. At present, the commonly used seismic frequency extension processing techniques include frequency extension technology based on deconvolution, frequency extension technology based on absorption attenuation compensation and inverse Q filter frequency extension technology, and frequency extension technology based on time-frequency analysis and time-spectrum compensation. The deconvolution technique improves the seismic bandwidth by compressing t...

AI Technical Summary

Problems solved by technology

Time-frequency analysis frequency extension technology starts from the perspective of signal processing, adapts to the non-stationary characteristics of seismic signals, and does not require ideal assumptions. Both low-frequency components and high-frequency components can be expanded, with high flexibility, but the spectral reconstruction of this method The rules lack rational basis, personal subjectivity is relatively large, the degree of amplitude preservation and fidelity of frequency extension results is unconvincing, and the level of signal-to-noise ratio may be significantly reduced, which affects the promotion of this technology in oil fields

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