V系统在随钻声波测井数据降噪中的应用  

Application of V-system in acoustic logging while drilling data denoising

作　　者：肖红兵[1,2] 杨锦舟[2] 鞠晓东[1] 乔文孝[1] 

机构地区：[1]中国石油大学油气资源与探测国家重点实验室,北京102249 [2]胜利油田钻井工艺研究院,山东东营257017

出　　处：《中国石油大学学报（自然科学版）》2009年第2期58-62,69,共6页Journal of China University of Petroleum(Edition of Natural Science)

基　　金：国家自然科学基金重点项目(10534040);国家自然科学基金面上项目(40574049和40874097);高等学校博士学科点专项科研基金项目(20070425028)

摘　　要：针对随钻声波测井过程中各种噪声干扰造成声波信号失真的问题,提出了使用线性V系统的降噪方法。首先,通过V系统变换将声波测井信号变换到频率域,然后去除其高频分量,再通过V系统反变换获得降噪后的信号。由于V系统是在L2[0,1]空间上的分段线性完备正交函数系,并且具有多分辨性质,所以V系统降噪相比经典的小波降噪有更好的效果。试验结果表明,该方法能够获得较好的降噪信号。For acoustic signal distortion problems caused by a variety of noises in acoustic logging while drilling （ LWD）, a denoising method by using a linear V-system was proposed. First, acoustic logging signals are transformed to frequency domain by V-system, and its high-frequency components are removed, then the signals after noise reduction are reconstructed by the inverse V-system transform. V-system is a class of complete orthogonal function system on L2 [ 0, 1 ] , and it is muhiresolution. So the linear discrete V-system transform （DVT） is better than traditional wavelet transform. The test results show that relatively good denoising signals can be obtained by linear DVT.

关 键 词：随钻声波测井 V系统 降噪 

分 类 号：P631.83[天文地球—地质矿产勘探]