Massive seismic source data SEG D segmentation classification mixed compression method

Abstract

The invention provides a massive seismic source data SEG D segmented classification mixed compression method, which comprises the following steps of: decompiling an SEG D data file, and performing Huffman coding on obtained quality control related parameters; recording take-off time and amplitude information of the auxiliary track in a specific time window; sequentially solving a time difference correction factor of each seismic channel on the arrangement, carrying out time difference correction on the seismic channel sampling by using the time difference correction factors, and calculating the sampling variation coefficient after the time difference correction of the arrangement and the previous arrangement; if the variable coefficient is greater than the threshold value, integer wavelet transform is carried out on the sampling data, the wavelet coefficient is quantized by using the dynamic threshold value, and arithmetic coding is carried out on the quantized data; if the variable coefficient is not greater than the threshold value, lossless coding is carried out on the difference value of the two ranked data; and carrying out code combination on the segmented and classified data according to a certain rule to form a character stream. According to the method, the quality control aging requirement of mass seismic acquisition sites is met, and distortion caused by data compression is avoided.

Description

technical field [0001] The invention relates to the technical field of oil and gas seismic exploration and development, in particular to a SEG D segmented classification hybrid compression method for massive seismic source data. Background technique [0002] Seismic data compression methods have gradually emerged and developed with the increase in the amount of oil and gas seismic exploration data. Around the beginning of this century, sporadic research reports and inventions have been made on the data encoding and acquisition system transmission data compression technology of seismic acquisition instruments. The theory and practice of density (two widths and one height) seismic exploration and the continuous deepening of research on compressed sensing technology have made great progress in seismic data compression technology. [0003] At present, there are mainly the following methods for seismic data compression: starting from the seismic acquisition signal, properly tran...

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Problems solved by technology

This patent refers to the data compression of the seismic sampling data stream relying on hardware. The measurement matrix used for compression is realized by hardware, and the compression method is adopted while collecting. Therefore, in order to ensure the reconstruction accuracy, the compression ratio is low, the maximum is less than 1:5, It is difficult to meet the on-site quality control requirements of seismic source data

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