Assuming that the transmitting parameters and formation model parameters are known, the total receiving field in each part of the formation can be obtained by equations (1) and (2). Therefore, the key to completing the forward calculation is to obtain the tensor Green's function. G(r,r^') in a uniform background medium has a clear analytical solution, while in a layered medium, it includes reflection and refraction on the interface. Except when there are few layered interfaces, it can be solved through complex theoretical calculations. , generally calculated using numerical methods.
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