一种基于测井数据特征的无损压缩方法

A lossless data compression method based on the characteristics of logging data

在有限的传输带宽下传输组合测井、成像测井数据,传输率受到限制.提出了一种基于测井数据特征的无损压缩方法,该方法可对测井数据进行压缩后再传输到地面,有效地提高了数据传输效率.描述了压缩方案、压缩处理及算法设计.对不同的数据类型用不同的压缩方法进行压缩,对其压缩率进行了对比.结果表明,采用帧相关压缩的压缩率最高,其他通用压缩方法因为没有基于测井数据特征压缩率较小;第一类数据的压缩率明显较大,组合测井的数据次之,成像测井数据的压缩率最小;压缩率随着压缩数据的增大而略有增大.

The transmission efficiencies of combination logging data and imaging logging data are restricted under finite bandwidth.A lossless data compression method based on the characteristics of logging data is put forward,it can transfer the logging data to surface after they are compressed,and therefore the transmission efficiency of logging data is effectively improved.The compression plan,compression processing and algorithm are described.Different types of data are compressed using different compression methods,and the compression ratios of them are compared.It is shown that,the compression ratio of frame-related compression method is the greatest,and the compression ratios of other compression methods are smaller;the compression ratio of the first kind of data is greater,that of combination logging data is secondary,and that of imaging logging data is the least;the compression ratio slightly increases with the increase of the quantity of the data.