Method for processing relevant/stack data in seismic prospecting

Abstract

The invention relates to a method for processing relevant/stack data in seismic prospecting, comprising the following steps: (1) hybrid algorithm combining fast Fourier transform algorithm and Hartley transform characteristics; (2) segmentation and summation in the FTT-Hartly hybrid algorithm; (3) threading arrangement of multi-core and multi-CPU parallel processing, wherein testing through an IBM 3755 server (4-core) leads to the following indicators: when no noise control is loaded, 2 milliseconds for sampling rate, 24 seconds for scanning signal, 32 seconds for seismic acquisition; when 8-second record length is obtained after the relevance/stack computation is carried out, time is no more than 3 seconds in case of processing 4000 courses and the time is no more than 4 seconds in case of processing 8000 courses; when noise control part is loaded(segmentation weight stack), time for computing 8000 courses ( record length of each course is different from the record length of the previous course) is no more than 7 seconds.

Description

technical field [0001] The invention relates to a fast correlation / superposition data processing method for field seismic exploration data acquisition of a large-scale seismic instrument. Background technique [0002] It is very common to use vibroseis as the excitation source of seismic acquisition signals to carry out field seismic exploration data acquisition construction. The most commonly used method for correlating / stacking calculation and processing of the collected seismic data is to make a correlation calculator and a stacking calculator by means of hardware for real-time calculation and processing. Taking a foreign large-scale seismic instrument as an example, the superposition operation and correlation operation are respectively completed by a noise editing processing board (ie, NEP board) and a fast Fourier processing board (ie, FTP board) plugged into the computer bus. Among them, the FTP board has two Motorola 96002DSP processors, and uses the fast Fourier tra...

AI Technical Summary

Problems solved by technology

[0005] (1) With the continuous development and enrichment of seismic exploration construction methods, the number of seismic channels participating in data acquisition at the same time is continuously expanding, and the data that needs to be correlated / stacked at the same time has increased massively, making the use of hardware correlation / stacking operators Bottleneck in data throughput

[0006] (2) Due to the influence of the limitations of the hardware design target and the technical indicators of the selected electronic devices, it is difficult to fundamentally solve this "bottleneck" through some expansion means in the later stage of use

[0007] (3) The hardware circuit design of the correlation / superposition calculator is complicated, and the research and development cycle is long, making it difficult to keep pace with changes in research and development and construction requirements in a short period of time

[0008] (4) When seismic acquisition is carried out in some industries (such as coalfield geological industry), the number of seismic acquisition channels at the same time is relatively small. If the hardware equipment of correlation / superposition calculator with strong processing capacity is configured, the cost of resources will be reduced. From a point of view, it seems too wasteful

But the hardware equipment of a kind of corresponding correlation / superposition calculator is specially developed for this purpose and the gain outweighs the gain.

[0009] (5) Research and development of related / superposition calculator hardware equipment requires large capital investment and high risk

[0020] (1) Compared with the hardware correlation / superposition calculator, the real-time performance is poor, and the software correlation / superposition calculator takes longer to process data of the same order of magnitude

[0021] (2) It is difficult to adapt to the development trend of seismic data acquisition in seismic exploration construction

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