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Numerical simulation of electromagnetic scattering of interface around borehole
DENG Shaogui, ZHANG Pan,WANG Zhengkai, YUAN Xiyong
(School of Geoscience in China University of Petroleum, Qingdao 266580, China)
Abstract:
The response to the interface is numerically simulated based on the electromagnetic scattering theory. Putting symmetrically the receiving antenna on two sides of the transmitting antenna, the scattered signal off the interface can be reflected by the difference of receiving signals. The electromagnetic responses to the bed boundary were analyzed at different frequencies, distances of antenna and resistivity contrast ratios of two sides' formations. The results show that electromagnetic scattering measurements can reach deeper sensitivity than most current tools. The contrast ratio of the formation resistivity determines the signal strength. The sensitivity depth becomes larger with increasing resistivity contrasts. A cross plot can be drawn to show the signal magnitude difference between the coaxial and tilt antenna, which can be easily used to determine the position of formation interfaces.
Key words:  electromagnetic logging  formation boundary  magnitude difference  detection depth  symmetrical antenna structure