CAJ | 학술논문

场源效应严重影响了可控源音频大地电磁法（ CSAMT）的应用效果，为了分析场源效应的影响，利用三维积分方程数值模拟计算方法，模拟场源下方存在三维异常体模型，然后做了相关的野外试验。模拟和野外试验证明场源下方基岩深浅不同，受影响的是低频段，高频段几乎不受影响；低阻体产生的场源复印效应更强，也就是说观测数据受低阻体影响更大。
장원효응엄중영향료가공원음빈대지전자법（ CSAMT）적응용효과，위료분석장원효응적영향，이용삼유적분방정수치모의계산방법，모의장원하방존재삼유이상체모형，연후주료상관적야외시험。모의화야외시험증명장원하방기암심천불동，수영향적시저빈단，고빈단궤호불수영향；저조체산생적장원복인효응경강，야취시설관측수거수저조체영향경대。
Source effects have serious impact on the application effect of CSAMT. In order to analyze the effect of the source effects, the authors used three?dimensional integral equation numerical simulation method to simulate 3D anomalous body below the source, and then made a field test. Simulations and field tests have proved that, due to the different depths of the bedrocks, only the low band is af?fected, whereas the high band is almost unaffected, and that the low resistivity body can generate stronger source overprint effects, so the observational data are more remarkably impacted by the low resistivity body.