Simulating surface-to-borehole electromagnetic remote detection responses using dyadic Green's functions
The dyadic Green's functions in horizontally layered anisotropic media were used to simulate the responses of three types of transmitting antennas in surface-to-borehole electromagnetic remote detection.These antennas include the collinear transmitting antenna,the side-line transmitting antenna,and the loop-line transmitting antenna.The study analyzed the in-fluence of frequency,transmitter-to-receiver horizontal distance,background formation anisotropy,and target zone conductiv-ity on each component of the electromagnetic fields.The results indicate that different transmitting methods and electromag-netic field components have varying abilities to identify the target zone.Among the three transmitting methods,the collinear transmitting method demonstrated the strongest overall identification capability and Ezx is the best component to identify the target zone.The detection depth of all transmitting methods decreases as frequency increases;however,the overall identifica-tion ability of the target zone correspondingly improves.The effect of changes in the transmitter-to-receiver horizontal distance on the detection depth varies across components,but this influence remain relatively minor.Variations in background forma-tion anisotropy and target zone conductivity also affect different components of the electromagnetic fields differently,with the Ezx produced by the collinear transmitting method being the most impacted.These findings offer theoretical guidance for de-signing schemes and selecting parameters in surface-to-borehole electromagnetic remote detection.
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