经过几十年的努力,海洋电磁法勘探已经走向实用阶段。海洋电磁法勘探的成效日益受到业界的广泛关注,但是可控源海洋电磁的三维模拟研究还远没有达到实用程度,本文基于对频率域三维海洋电磁的模拟及模型灵敏度分析,实现了对复杂研究目标的模拟,提出了定量确定高阻异常体边界的方法。采用MVO曲线二次导数来指示高阻异常体的影响消失并确定高异常体的边界。在空气波占主导的远区,建议采用平面波(MT)理论计算视电阻率可以提高方法的适应性。 After decades of efforts, marine electromagnetic exploration has come to practical stage. However, the three-dimensional simulation of controlled-source marine electromagnetism is far from practical. Based on the simulation of three-dimensional marine electromagnetic in the frequency domain and the sensitivity analysis of the model, Target simulation, proposed a quantitative method to determine the boundaries of high resistivity anomalies. The second derivative of the MVO curve is used to indicate the disappearance of the high-resistivity anomalous body and to determine the boundaries of the high-anomalous body. In areas far dominated by air waves, it is recommended that the apparent resistivity can be calculated using plane wave (MT) theory to improve the adaptability of the method.