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1. 发明申请

US20070156359A1 Adaptive equalization of downhole acoustic receivers 有权
标题翻译：井下声学接收机的自适应均衡
公开(公告)号：US20070156359A1
公开(公告)日：2007-07-05
申请号：US11323674
申请日：2005-12-30
申请人： Georgios Varsamis , Joakim Blanch , Arthur Cheng , Calvin Kessler , Denis Schmitt , Batakrishna Mandal
发明人： Georgios Varsamis , Joakim Blanch , Arthur Cheng , Calvin Kessler , Denis Schmitt , Batakrishna Mandal
IPC分类号： G01R29/00
CPC分类号： G01V1/44
摘要： The present invention relates generally to a method and apparatus utilized in hydrocarbon exploration. More specifically, the present invention relates to the utilization of acoustic sources and receivers to determine acoustic properties of geologic formations as a logging tool traverses them, be it a wireline logging tool and/or a logging while drilling (LWD) tool. More particularly, the present invention is directed to methods of, and apparatus for, adaptive equalization of receivers to reduce and/or substantially eliminate sensitivity mismatch. A method is provided, the method comprising detecting arrival times of a first wave at each of a plurality of receivers, determining a first place in a well when the arrival times of the first wave are substantially the same at each of the plurality of receivers, and estimating effective receiver sensitivities and equalization factors for each of the plurality of receivers using a Stoneley wave amplitude received by the plurality of receivers at the first place in the well. The method also comprises correcting amplitudes of a second wave received by the plurality of receivers using the estimated effective receiver sensitivities and equalization factors for each of the plurality of receivers.
摘要翻译：本发明一般涉及在烃勘探中使用的方法和装置。更具体地说，本发明涉及使用声源和接收器来确定测井工具横穿它们的地质构造的声学特性，无论是电缆测井工具和/或钻井测井（LWD）工具。更具体地，本发明涉及用于减少和/或基本消除灵敏度不匹配的接收机的自适应均衡的方法和装置。提供了一种方法，所述方法包括：在多个接收器中的每一个处检测第一波的到达时间，当所述第一波的到达时间在所述多个接收机中的每一个处基本相同时，确定井中的第一位置，以及使用由所述井中的所述第一位置处的所述多个接收器接收的斯通利波振幅来估计所述多个接收机中的每一个的有效接收机灵敏度和均衡因子。该方法还包括使用针对多个接收机中的每一个的所估计的有效接收机灵敏度和均衡因子校正由多个接收机接收的第二波的振幅。

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