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Time-Domain Difference Modeling of the Electromagnetic Wave Logging

Author: YaoJun
Tutor: FanXiaoMin
School: Jilin University
Course: Earth Exploration and Information Technology
Keywords: Finite Difference Time Domain Electromagnetic wave logging Phase difference Amplitude ratio
CLC: P631.84
Type: Master's thesis
Year: 2008
Downloads: 212
Quote: 0
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Abstract


The finite-difference time-domain (FDTD) method after 30 years of development , has become an effective numerical method is widely used in many fields of electromagnetism . Derived FDTD method in cylindrical coordinates underground lossy dielectric dimensional TE and TM mode and differential equations in the three - dimensional case , and analysis of the stability conditions need to be satisfied in the process of applying the FDTD method to reduce the numerical dispersion conditions as well as the settings of the excitation source and select issues . Derive a cylindrical coordinate system underground lossy dielectric Mur first and second order absorbing boundary conditions , and verify its good absorption effect . Electromagnetic waves the logging also called dielectric logging around the wellbore formation conductivity and dielectric constant can be measured simultaneously . From basic theory of electromagnetic wave logging method , principle of electromagnetic wave logging tool structure and classification , and the FDTD method is applied to the simulation of electromagnetic wave logging , analysis and summed suitable for the simulation of electromagnetic wave logging FDTD the method of application conditions , such as the source point of the set , the set of boundary conditions , the formation parameters settings . Finally , through a lot of calculation model has been such as the thickness of the log response , the logging of borehole log response and electromagnetic wave propagation in the stratigraphic boundary surface logging response characteristics of the actual application is valuable the data and conclusions .

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CLC: > Astronomy,Earth Sciences > Geology > Geology, mineral prospecting and exploration > Geophysical exploration > Underground geophysical > Collation , interpretation of measurement results
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