| 一种新型随钻电阻率测井仪器的响应和刻度 |
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| 引用本文： | 魏宝君.一种新型随钻电阻率测井仪器的响应和刻度[J].地球物理学报,2007,50(2):632-641. |
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| 作者姓名： | 魏宝君 |
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| 作者单位： | 中国石油大学(华东)物理科学与技术学院，东营257061 |
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| 基金项目： | 中国石油大学博士科研基金 |
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| 摘 要： | 对一种新型随钻电阻率测井仪器在均质地层中的电磁场分布和接收线圈的响应特性进行分析，并对仪器在真空中的刻度方法进行研究.推导出了圆柱坐标系下径向成层介质中磁流源并矢Green函数的矢量本征函数展开式，从而得到研究该仪器电磁场分布、接收线圈响应、刻度方法所必需的解析计算式.计算发现，钻铤的存在大大提高了仪器的定向探测性能.计算还发现，不同的钻铤尺寸、线圈系到钻铤不同的距离对线圈系在真空中的响应值具有较大影响.钻铤在地层中产生的实部信号可近似认为恒定，而当地层电导率大于001 S/m时，钻铤在地层中产生的虚部信号亦可近似认为恒定.数值计算表明，仪器偏心程度越大，钻铤半径越大，仪器中刻度环电阻所对应的视电导率值越小.
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| 关 键 词： | 随钻测井 响应 刻度 并矢Green函数 钻铤 |
| 文章编号： | 0001-5733（2007）02-0632-10 |
| 收稿时间： | 2006-3-15 |
| 修稿时间： | 2006-03-15 |
A study on tidal force/stress triggering of strong earthquakes |
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| WEI Bao-Jun.A study on tidal force/stress triggering of strong earthquakes[J].Chinese Journal of Geophysics,2007,50(2):632-641. |
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| Authors: | WEI Bao-Jun |
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| Institution: | Faculty of Physical Science and Technology, China University of Petroleum, Dongying 257061, China |
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| Abstract: | The distribution of electromagnetic fields and the feature of receiver coil's response for a new logging-while-drilling resistivity tool in homogeneous earth are analyzed, and the calibration method of the tool in vacuum is studied. The vector eigen function expansion formulae of the dyadic Green's functions with magnetic current source in radial layered medium are derived in cylindrical coordinate system, and hence the needed analytical formulae are obtained to study the distribution of electromagnetic fields, the receiver coil's response and the calibration method of the tool. It is shown through computation that the orientative exploring capacity of the tool is greatly enhanced because of the existence of the drill collar. It is also shown that different size of the drill collar and different distance between the coils and the drill collar have obviously different influence on the response of the coils in vacuum. The real-part signal produced by the drill collar in the earth can be approximately regarded as constant, and the imaginary part can also be approximately regarded as constant when the conductivity of the earth is greater than 0.01S/m. Numerical computation has shown that the bigger the tool's eccentricity level and the drill collar's radius, the smaller the apparent conductivity of the calibration ring's resistance. |
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| Keywords: | Logging-while-drilling (LWD) Response Calibration Dyadic Green's functions Drill collar |
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