基于沃尔什变换的电测井曲线分层算法  

Stratifying algorithm of electric well logs based on Walsh transform

作　　者：王萍[1] 臧玉卫[2] 马刚[3] 刘丹红[1] 

机构地区：[1]天津大学理学院,天津300072 [2]天津大学北洋科技开发有限公司,天津300072 [3]上海同济大学软件学院,上海200433

出　　处：《计算机应用》2008年第S2期366-368,371,共4页journal of Computer Applications

基　　金：天津市科技发展计划资助项目(06YFGZGX05600)

摘　　要：根据电测井曲线可以了解地层构造。为了找出含水砂层,基于人工分层的原理,采用沃尔什变换对电测井曲线进行计算机自动分层,将地下土层分为含水层和隔水层。给出了层界点判断算法,尤其对难以确定的下降终止点判断算法进行了深入分析。另外,对不同截止列率下的分层结果进行了对比。结果表明选取适当的截止列率是影响分层效果的关键因素,在合适的截止列率下的分层效果比较接近人工分层的结果。The stratigraphic structure can be learned according to electric well logs.To find water-bearing sand stratums,the Walsh transform was used to do automatic stratification with computer on electric well logs based on the principle of artificial stratification and stratified the stratums into water-bearing stratums and water-resisting ones.An algorithm was proposed to judge the points of layer boundary and the judging algorithm of the descending termination points which was proved to be difficult to locate was analyzed.Moreover,the stratification results under different cut-off sequencies were compared.The results show that choosing appropriate cut-off sequency is the key factor of the stratification results and the stratification results under the appropriate cut-off sequency are close to those by using artificial method.

关 键 词：沃尔什变换 电测井曲线 分层算法 截止列率 

分 类 号：TP391.41[自动化与计算机技术—计算机应用技术]