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《Well Logging Technology》 2003-04
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Numerical and Experimental Study on Multi-frequency Electromagnetic Well Logging.

Liu Sixin, Motoyuki Sato.  
A novel experimental multi-frequency electromagnetic well logging system is introduced. The downhole sonde includes one transmitter and two receivers, while the data is transmitted through optical fibers. The antenna employed is cylindrical dipole with certain frequency width, the surface unit includes a network analyzer controlled by computer. The frequency range of the antenna is about 40-100 MHz. The measured amplitude ratio and phase difference are converted into the conductivity and the dielectric constant which are related to the physical property of the surrounding formation. The dielectric constant is mainly determined by the phase difference while the conductivity is mainly determined by the amplitude ratio. The sensitivity of the dielectric constant is higher but the conductivity measurement is not so sensitive while the conductivity is less than 0. 001 S/m. The Finite Difference Time Domain (FDTD)method is applied to compute the responses of the multi-frequency electromagnetic well logging. It is demonstrated that dielectric constant can be used to discern the water layer and the oil layer in petroleum industry even if the formation water is not saline. The developed system is testified experimentally in a test borehole, the measured results from which are in good agreement with the borehole television image.
【Fund】: 吉林大学青年基金资助(2002年);; 教育部回国人员启动基金资助(2002年)
【CateGory Index】: P631.81
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