Empirical mode decomposition method of seismic section

Abstract

The invention relates to the field of oil gas seismic exploration and particularly relates to an empirical mode decomposition method of a seismic section. The method relates to two-dimensional instantaneous attribute analysis of the seismic section and is a computing method for decomposing a single-component two-dimensional intrinsic mode function from the seismic section. In a two-dimensional empirical mode decomposition process, an extreme value detection method of two point adjacent regions of a time direction and an equality constrained tight framework region rarefaction curved surface interpolation method are adopted to solve an extreme value detection problem of the seismic section and an envelope surface interpolation problem of large-scale irregular data. According to the empirical mode decomposition method disclosed by the invention, a computing result is obviously better than that of an existing two-dimensional empirical mode decomposition rapid method, and the computing time is roughly equal.

Description

technical field [0001] The invention relates to the field of oil and gas seismic exploration, and more specifically, relates to an empirical mode decomposition method of seismic sections in the analysis of seismic instantaneous attributes. Background technique [0002] The traditional two-dimensional seismic section complex analysis technique (A.E.Barnes, Theory of 2D complex seismic trace analysis, Geophysics, Vol.61, No.1, 1996, 264–272) is to directly perform two-dimensional Hilbert transformation on the seismic section (Bidimensional Hilbert Transform, BHT), to form an analytical signal, and then calculate the instantaneous seismic characteristic attributes such as instantaneous amplitude, instantaneous phase, and instantaneous frequency, which reflect the micro-local changes in the process of seismic wave propagation, and can help determine the lithology, lithofacies changes and The properties of fluids contained in rock pores. However, this complex analysis technique ...

AI Technical Summary

Problems solved by technology

For seismic sections, the BEEMD method proposed by Zhaohua Wu has the advantage of small amount of calculation and fast operation, but it overemphasizes the extreme value information in the two directions of space and time, and ignores the difference between these two directions, losing a lot of waveforms Event information, not suitable for seismic section data processing

At the same time, due to the continuous addition of white noise during the decomposition process, when the instantaneous properties are finally calculated by BIMF, a random noise background will be generated

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