交叉多极阵列声波测井在套管井中的应用

为寻求裸眼井地层纵波测井资料缺失时的补救办法,对在大港油田滩海区块5口井中的声波测井资料进行了分析,试探从过套管交叉多极阵列声波(XMAC)测井资料中提取地层纵波信号的可行性.XMAC在套管井中采用单极全波测量模式.从下套管前后测得的全波波形的差异可区别套管波和地层纵波,采用慢度-时间相关STC(Slowness-Time Coherence)法可提取地层纵波.对比了在不同水泥胶结质量、套管状况和井眼条件下的套管井与裸眼井声波测井资料,归纳出了过套管声波测井的使用条件和局限性.当套管及地层都与水泥环胶结良好时,方可从过套管XMAC全波资料中提取出地层纵波信号.

Application of Cross Multipole Array Acoustic Logging in Cased Hole

For seeking a way to remedy absence of formation compressional wave data in open hole,the acoustic logging data of 5 wells on beach or offshore in Dagang Oilfield were analyzed to explore the feasibility of extracting formation compressional wave signal from through-casing cross multipole array acoustic(XMAC) logging data.XMAC works with monopole full wave mode in cased hole.The casing wave and formation compressional wave can be differentiated by the waveform difference between open hole and cased hole,and the formation compressional wave can be extracted by a STC(slowness-time coherence) method.Based on comparison of acoustic data logged in different conditions of cementation,casing and borehole,the applicable condition and limitation of through-casing acoustic logging are summarized.The formation compressional wave signal can be extracted from the through-casing XMAC full wave data just on the condition that both casing and formation are well cemented.