超声测井仪器数据压缩算法研究

Research on data compression algorithm of ultrasonic logging tool

随着超声测井技术的不断进步以及测井工程服务需求的不断发展,超声测井仪器在测井工程服务中越来越不可或缺。超声成像测井仪有数据量大的特点,信号压缩是超声成像测井仪的重要组成部分。根据各种压缩算法的特性以及超声测井信号的存储和传输需求,针对超声信号的特点,制定了有损压缩和无损压缩结合的压缩算法方案。通过对超声垂直入射回波信号和斜入射Lamb波信号进行压缩编码实验,验证了压缩算法的可行性,并对比了其优劣。为超声测井信号的压缩算法的开发提供了思路。

With the developments of ultrasonic logging technology and the evolution of logging engineering services requirements,ultrasonic imaging logging tool becomes more and more indispensible.Data compression is an important part of ultrasonic logging tool which is featured with large amount of data.On the basis of the feature of all kinds of data compression algorithms and the saving and transmitting requirements of ultrasonic logging data,this article combines the loss compression algorithm and the lossless compression algorithm according to the characteristics of ultrasonic logging signal.Through compressing the reflected signal which is acquired when the ultrasonic incidence direction is perpendicular to the case＇s surface and the Lamb signal which is acquired when the ultrasonic incidence direction is oblique to the case＇s surface,the feasibility of the compression algorithms is verified and their performance is compared.This article provides ideas for the research and development of ultrasonic logging data＇s compression algorithm.