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    • 4. 发明申请
    • METHOD AND DEVICE FOR ESTIMATING SONIC SLOWNESS IN A SUBTERRANEAN FORMATION
    • 用于估计地下构造中的声能衰减的方法和装置
    • WO2017165341A2
    • 2017-09-28
    • PCT/US2017/023296
    • 2017-03-21
    • SCHLUMBERGER TECHNOLOGY CORPORATIONSCHLUMBERGER CANADA LIMITEDSERVICES PETROLIERS SCHLUMBERGERGEOQUEST SYSTEMS B.V.
    • KHADHRAOUI, BassemKISRA, Saad
    • G01V1/44G01V1/52E21B47/00
    • G01V1/282G01V1/284G01V1/305G01V1/48G01V1/50G01V2210/42G01V2210/47G01V2210/6161G01V2210/667
    • A method for estimating sonic slowness comprising : obtaining (700) a plurality of sonic waveforms are received by a plurality of receivers of a logging tool after emission of a source sonic wave by a transmitter, obtaining (710) slowness models of the subterranean formation, a slowness model being defined by a at least one cell of constant slowness for at least one wave energy mode, computing (720), for each slowness model, a set of candidate travel times, a candidate travel time of a set of candidate travel times being computed for a wave energy mode and a position of a receiver of the plurality of receivers, computing (730) a relevance indicator for each set of candidate travel times based on the recorded sonic waveforms; searching (740) a match between the sets of candidate travel times and the recorded sonic waveforms by searching a relevance indicator which is optimum, computing (750) a sonic slowness estimate for the subterranean formation from a set of candidate travel times for which the relevance indicator is optimum.
    • 一种用于估计声速慢度的方法,包括:在发射机发射源声波之后,获得(700)由测井工具的多个接收器接收的多个声波波形,获得(710) )地层的慢度模型,慢度模型由至少一个波能量模式的恒定慢度的至少一个单元定义,为每个慢度模型计算(720)一组候选旅行时间,候选旅行 针对多个接收器的波能量模式和接收器的位置计算一组候选行进时间的时间,基于所记录的声波波形计算(730)每组候选行进时间的相关性指标; 通过搜索最佳的相关性指标来搜索(740)所述候选旅行时间集合与所述记录的声波波形之间的匹配,从一组候选旅行时间计算(750)所述地下地层的声波慢度估计,其中所述相关性指标 指标是最佳的。