相控线阵技术在套管井声波测井地层信息测量中的应用  

Application of linear phased-array technique to estimation of acoustic properties of formation in acoustic logging of cased hole

作　　者：陈雪莲[1] 许孝凯[1] 

机构地区：[1]中国石油大学地球资源与信息学院

出　　处：《石油学报》2008年第5期777-781,共5页Acta Petrolei Sinica

基　　金：国家自然科学基金项目(No.40574049);中国石油天然气集团公司创新基金项目(06E1020)联合资助

摘　　要：将相控线阵技术引入到套管井声波测井中,对不同胶结状况下相控线阵声源激发的全波波形进行了数值计算。利用时间—慢度相关法对计算结果进行的分析表明:利用相控线阵声源作为发射器可以明显提高全波波形的信噪比。当Ⅰ、Ⅱ界面均胶结良好时,在满足地层滑行纵波同相位叠加的条件下,随着相控线阵声源阵元个数的增加,地层滑行纵波的幅度基本呈线性增加;在Ⅰ、Ⅱ界面胶结性较差时,相控声源与单个点声源相比,可大大增强地层波的能量,有利于在套管井中进行地层声学性质的可靠性测量。The linear phased-array technique was introduced into cased hole acoustic logging. The synthesized full waveforms excited by the linear phased array source were numerically simulated under the different bonded conditions. The numerical simulation results were analyzed by using the slowness time coherence （STC） method. The analysis results show that the linear phased array source can enhance clearly signal-to-noise ratio of the synthesized full waveforms. The amplitude of the refracting compressional wave increases linearly with increment of the element numbers of the linear phased-array source when the angle of radiated acoustic beam is close to the first critical angle in good bonded cased hole. The linear phased-array sources compared to one point source can greatly enhance the capacity of formation waves in bad bonded cased hole and has great importance on estimating acoustic velocity of formation.

关 键 词：相控线阵技术 套管井 声波测井 波形分析 水泥胶结 时间 慢度相关法 

分 类 号：TE19[石油与天然气工程—油气勘探]