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1.发明授权
公开(公告)号：US6147496A
公开(公告)日：2000-11-14
申请号：US886725
申请日：1997-07-01
CPC分类号： G01V3/28
摘要： A method is provided for determining an electric conductivity of an earth formation formed of different earth layers, which earth formation is penetrated by a wellbore containing a wellbore fluid, is provided. The method includes the steps of: lowering an induction logging tool into the wellbore to a location surrounded by a selected one of the earth layers, the tool having a magnetic field transmitter effective to induce magnetic fields of different frequencies in the earth formation, and a magnetic field receiver effective to receive response magnetic fields and to provide a signal representative of each response magnetic field, at least one of the transmitter and the receiver having a plurality of magnetic dipole moments in mutually orthogonal directions. At least two of the different frequencies are selected, and for each selected frequency, the transmitter is operated so as to induce a magnetic field in the earth formation and the receiver is operated so as to provide a signal representing a response magnetic field, wherein the at least one of the transmitter and receiver is operated in the mutually orthogonal directions. The signals are combined in a manner so as to create a combined signal having a reduced dependency on the electric conductivity in the wellbore region. The formation resistivity and the relative orientation of the logging tool with respect to the formation layering is determined from the combined signal.
摘要翻译： 提供了一种用于确定由不同的地层形成的地层的电导率的方法，所述地层由包含井筒流体的井筒穿透而形成。 该方法包括以下步骤：将感应测井工具降低到井眼中到由所选择的一个接地层围绕的位置，所述工具具有有效地诱导地层中不同频率的磁场的磁场发射器，以及 磁场接收器有效地接收响应磁场并提供表示每个响应磁场的信号，发射器和接收器中的至少一个具有在相互正交的方向上的多个磁偶极矩。 选择不同频率中的至少两个，并且对于每个选定的频率，发射机被操作以在地球形成中感应出磁场，并且操作接收机以提供表示响应磁场的信号，其中 发射机和接收机中的至少一个在相互正交的方向上操作。 以这样的方式组合信号，以产生对井眼区域的电导率的依赖性降低的组合信号。 根据组合信号确定测井工具相对于地层分层的地层电阻率和相对取向。
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