Y2001-62863-142 0118619采用球面坐标有限差分时域法的同轴导电球面腔内的电磁场模拟=Simulations of EM fields inside the con-centric conducting spherical cavity using the FD-TD inspherical coordinates[会,英]/Phongcharoenpa...Y2001-62863-142 0118619采用球面坐标有限差分时域法的同轴导电球面腔内的电磁场模拟=Simulations of EM fields inside the con-centric conducting spherical cavity using the FD-TD inspherical coordinates[会,英]/Phongcharoenpanich,C.& Khcomwong,E.//2000 5th International Symposiumon Antennas,Propagation and EM Theory Proceed-ings.—142～145(PC)介绍了球面坐标有限差分时域(FD-TD)法及其在同轴导电球面腔内电磁场模拟中的应用。分析了稳定性标准。给出了 FD-TD 参数与方程以及数值结果。展开更多
Since the ocean bottom is a sedimentary environment wherein stratification is well developed, the use of an anisotropic model is best for studying its geology. Beginning with Maxwell＇s equations for an anisotropic mo...Since the ocean bottom is a sedimentary environment wherein stratification is well developed, the use of an anisotropic model is best for studying its geology. Beginning with Maxwell＇s equations for an anisotropic model, we introduce scalar potentials based on the divergence-free characteristic of the electric and magnetic （EM） fields. We then continue the EM fields down into the deep earth and upward into the seawater and couple them at the ocean bottom to the transmitting source. By studying both the DC apparent resistivity curves and their polar plots, we can resolve the anisotropy of the ocean bottom. Forward modeling of a high-resistivity thin layer in an anisotropic half-space demonstrates that the marine DC resistivity method in shallow water is very sensitive to the resistive reservoir but is not influenced by airwaves. As such, it is very suitable for oil and gas exploration in shallowwater areas but, to date, most modeling algorithms for studying marine DC resistivity are based on isotropic models. In this paper, we investigate one-dimensional anisotropic forward modeling for marine DC resistivity method, prove the algorithm to have high accuracy, and thus provide a theoretical basis for 2D and 3D forward modeling.展开更多
文摘Y2001-62863-142 0118619采用球面坐标有限差分时域法的同轴导电球面腔内的电磁场模拟=Simulations of EM fields inside the con-centric conducting spherical cavity using the FD-TD inspherical coordinates[会,英]/Phongcharoenpanich,C.& Khcomwong,E.//2000 5th International Symposiumon Antennas,Propagation and EM Theory Proceed-ings.—142～145(PC)介绍了球面坐标有限差分时域(FD-TD)法及其在同轴导电球面腔内电磁场模拟中的应用。分析了稳定性标准。给出了 FD-TD 参数与方程以及数值结果。
基金financially supported by the National Hi-tech Research and Development Program of China(863 Program)(No.2012AA09A20103)
文摘Since the ocean bottom is a sedimentary environment wherein stratification is well developed, the use of an anisotropic model is best for studying its geology. Beginning with Maxwell＇s equations for an anisotropic model, we introduce scalar potentials based on the divergence-free characteristic of the electric and magnetic （EM） fields. We then continue the EM fields down into the deep earth and upward into the seawater and couple them at the ocean bottom to the transmitting source. By studying both the DC apparent resistivity curves and their polar plots, we can resolve the anisotropy of the ocean bottom. Forward modeling of a high-resistivity thin layer in an anisotropic half-space demonstrates that the marine DC resistivity method in shallow water is very sensitive to the resistive reservoir but is not influenced by airwaves. As such, it is very suitable for oil and gas exploration in shallowwater areas but, to date, most modeling algorithms for studying marine DC resistivity are based on isotropic models. In this paper, we investigate one-dimensional anisotropic forward modeling for marine DC resistivity method, prove the algorithm to have high accuracy, and thus provide a theoretical basis for 2D and 3D forward modeling.
