CAJ | 학술논문

广域电磁法采用均匀大地表面水平电偶源的全区精确表达式定义广域视电阻率，与卡尼亚视电阻率相比，能更好地反映地电模型的电性特征。利用广域视电阻率定义方法定义了E?Eφ方式的广域视电阻率、远区视电阻率及近区视电阻率，考虑观测方位角的影响，同时得出了E?Eφ观测装置的装置系数和电磁响应函数。对3层介质的A型、Q型、K型和H型的一维正演计算分析表明：E?Eφ观测装置的广域电磁法的观测方位角的影响相当于φ=90°时观测坐标系的旋转，通过适当的校正，任意φ角的测深曲线更能真实地反映地电断面随深度的客观变化，综合3种不同视电阻率的分析，能够较好地识别人工源频率域测深中电磁场不同的渐近特性。基于E?Eφ方式的广域电磁法扩大了观测范围，具有更好的应用前景。
엄역전자법채용균균대지표면수평전우원적전구정학표체식정의엄역시전조솔，여잡니아시전조솔상비，능경호지반영지전모형적전성특정。이용엄역시전조솔정의방법정의료E?Eφ방식적엄역시전조솔、원구시전조솔급근구시전조솔，고필관측방위각적영향，동시득출료E?Eφ관측장치적장치계수화전자향응함수。대3층개질적A형、Q형、K형화H형적일유정연계산분석표명：E?Eφ관측장치적엄역전자법적관측방위각적영향상당우φ=90°시관측좌표계적선전，통과괄당적교정，임의φ각적측심곡선경능진실지반영지전단면수심도적객관변화，종합3충불동시전조솔적분석，능구교호지식별인공원빈솔역측심중전자장불동적점근특성。기우E?Eφ방식적엄역전자법확대료관측범위，구유경호적응용전경。
Wide field electromagnetic method defines the apparent resistivity by the accurate expression of full-zone of horizontal electric dipole source in homogeneous earth surface. Compared with the Cagniard apparent resisitivity, it can preferably show the electrical characteristics of geoelectric model. The computational formula of the improved apparent resistivity of E?Eφ array in the wide field electromagnetic method, near-zone apparent resistivity and far-zone apparent resisitivity is defined, the influence of observed azimuth is considered and the coefficient of the observation array and electromagnetic response function is obtained by the pattern of wide field electromagnetic apparent resistivity definition. Based on the calculation and analysis of curve A, curve Q, curve K and curve H of three-layer model in 1-D forward modeling, the influence of observation azimuth (φ) is equal to the rotation of the coordinate system atφ=90° in the wide field electromagnetic sounding of the E?Eφarray. Through proper calibration, the sounding curve of the arbitrary angle azimuth (φ) can more truly show the objective change of geoelectric section with the depth. Through comprehensive analysis of three different apparent resistivities, the different asymptotic characteristics of electromagnetic field in the controlled source frequency sounding method can be well identified. The wide field electromagnetic sounding method based on the observation of E?Eφarray can expand the observed scope, and has better prospect of application.