首页> 外国专利> Measurement of in-phase and out-of-phase components of low frequency A.C. magnetic fields within cased boreholes to measure geophysical properties of geological formations

Measurement of in-phase and out-of-phase components of low frequency A.C. magnetic fields within cased boreholes to measure geophysical properties of geological formations

机译:测量套管井内低频交流磁场的同相和异相分量,以测量地质构造的地球物理特性

摘要

This invention relates to the measurement of the longitudinal components of low frequency A.C. magnetic fields from within cased boreholes which are used to measure geophysical properties of geological formations. The applied A.C. magnetic fields are generated by passing low frequency A.C. current through insulated wires or by conducting low frequency A.C. current through geological formations, either of which are examples of conducting A.C. currents through different "circuit pathways". The currents generating the applied A.C. magnetic fields are in the frequency range between 0.001 Hz and 20 Hz. The measured longitudinal components of the resulting total A.C. magnetic fields within the cased boreholes are responsive to various geophysical parameters which include the resistivities of the portions of the geological formations subject to said applied A.C. magnetic fields. Measurements of the in-phase parts and the out-of-phase parts of the longitudinal field components are defined in relation to the phases of the A.C. currents conducted through the "circuit pathways".
机译:本发明涉及从套管井眼中测量低频交流磁场纵向分量的方法,该磁场用于测量地质构造的地球物理性质。施加的交流磁场是通过使低频交流电流通过绝缘导线或通过使低频交流电流通过地质构造而产生的,这两种都是通过不同“电路路径”传导交流电流的例子。产生施加的交流磁场的电流的频率范围为0.001 Hz至20 Hz。套管井眼内所产生的总交流磁场的测得的纵向分量对各种地球物理参数作出响应,这些参数包括地质构造部分承受所述施加的交流磁场的电阻率。纵向场分量的同相部分和异相部分的测量是相对于通过“电路路径”传导的交流电流的相位来定义的。

著录项

  • 公开/公告号US5065100A

    专利类型

  • 公开/公告日1991-11-12

    原文格式PDF

  • 申请/专利权人 PARAMAGNETIC LOGGING INC.;

    申请/专利号US19900474930

  • 发明设计人 WILLIAM B. VAIL III;

    申请日1990-02-05

  • 分类号G01V3/28;G01V3/24;

  • 国家 US

  • 入库时间 2022-08-22 05:23:43

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