Automatic pickup method of earthquake preliminary wave based on mean shift clustering analysis

Abstract

The invention discloses an automatic pickup method of an earthquake preliminary wave based on mean shift clustering analysis. The method comprises the steps of: preprocessing earthquake data, converting waveform information into point density information, performing clustering on preprocessed records, giving a channel with a higher signal-to-noise ratio to serve as an initial channel for startingpickup, optimizing clustering centers corresponding to the preliminary wave according to the principle of minimum time difference starting from the initial channel, processing a record obtained from single shot by using a MeanShift clustering algorithm in view of the characteristic that the amplitude of the preliminary wave is the highest, optimizing the clustering result, and obtaining a corresponding first arrival time to serve as an automatic pickup result. According to the automatic pickup method disclosed by the invention, a probability density distribution function of sample data does not need to be known in advance, dependence is completely made on the calculation of sample points, certain convergence is performed in the case that the sampling is sufficient, and density estimationcan be performed on data complying with arbitrary distribution.

Description

technical field [0001] The invention relates to a method for automatically picking up first-arrival waves of an earthquake, in particular to an automatic picking-up method for first-arrival waves of an earthquake based on mean shift clustering analysis. Background technique [0002] Seismic exploration is one of the most widely used exploration methods to find and identify oil and gas resources today. Among them, the processing of seismic data plays an important role in subsequent structure interpretation and searching for target oil and gas reservoirs. First arrival picking is the preliminary work of seismic data processing, which picks the first effective wave received by the instrument, that is, the first arrival wave. The first arrival waves in seismic records have relatively strong energy. When the geological structure is relatively simple, it is relatively easy to pick up the first arrivals directly on the seismic records. However, in places with complex geological co...

AI Technical Summary

Problems solved by technology

[0003] Manual picking is the most primitive method of first-arrival acquisition. This method can be applied to work areas with a relatively small workload. However, in the case of a relatively heavy workload, manual picking will consume a lot of time and energy. At the same time, The quality of the results obtained by manual picking will be affected by the level of the processor, and in the face of a huge workload, manual mistakes are inevitable

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