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《Chinese Journal of Geophysics》 1995-S1
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THE THEORETICAL RESEARCH OF HIGH FREQUENCY ELECTROMAGNETIC WAVE LOGGING BY SYMMETRICAL MEASUREMENT

FENG QING-GUO; LIU MAN-FEN; LIU YING-CHUN;WANG XIU-JIANG; YANG SHAN-DE (Department of Physics and Center for theoretical Physics, Jilin University , Changchun 130023)  
In this paper an efficient numerical mode matching method is used to analyze the electromagnetic response for the high frequency electromagnetic wave logging. The borehole environment consists of an arbitrary number of horizontal and cylldrlcal layers. By numerical modeling, it is found that the asymmetric measurement of present T1-R1-R2 (one transmitter and two receivers) tool, because of its asymmetric form, often results in great distortion of the amplitude-ratio curve and no matching between the curves of amplitude-ratio and phase difference. This lowers the tool resolution. These drawbacks can be overcomed by symmetrical measurement. The effects of invasion and enclosing rock of high frequency electromagnetic wave logging with symmetrical measurement are first investigated systematilly. An interesting feature is the negative response seen in phase difference measurement by the shoulder effect and in amplitude ratio by me invasive effect. It is found that there is some compensation between me effects of invasion and enclosing rock. This is advantageous to discerning thin reservoir bed.
【Fund】: 国家自然科学基金大庆石油管理局联合资助
【CateGory Index】: P631.8
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