(1. 中国海洋大学 海底科学与探测技术教育部重点实验室，青岛 266100；
2. 中南大学 地球科学与信息物理学院，长沙 410012)
摘 要: 介绍一种海洋可控源电磁场一维反演方法，海洋可控源电磁一维正演是通过汉克尔变换求得的。采用正则化高斯-牛顿法对海洋可控源电场分量和磁场分量进行反演。在一维典型海底高阻模型上进行反演方法的正确性和有效性验证。结果表明：高斯-牛顿反演方法在反演初期收敛很快，数据拟合误差在10次反演迭代内即可下降到2.0左右，在反演后期收敛放缓并出现震荡收敛现象；但在20多次迭代收敛，反演结果能较好指示高阻薄层的位置，与理论模型吻合较好。
关键字: 海洋可控源电磁法；汉克尔变换；高斯-牛顿法；一维反演
（1. Key Laboratory for Submarine Science and Exploration Technology, Ministry of Education,
Ocean University of China, Qingdao 266100, China;
2 School of Geosciences and Info-Physics, Central South University, Changsha 410012, China）
Abstract:An one-dimensional inversion algorithm for marine controlled-source electromagnetic (CSEM) data was presented. The Hankel transform was used to implement marine CSEM one-dimensional (1D) forward modeling. The regularized Gauss-Newton (GN) method was applied to invert both the electric and magnetic field data. A 1D canonical model with a high resistivity thin reservoir layer was used to test our inversion algorithm. The inversion results of synthetic data show that the Gauss-Newton method converges fast at the first iterative stage, and the misfit reduces by about 2.0 with less than 10 iterations of inversion. After a few iterations, the convergence slows down and the data misfit decays oscillate at the final stage of inversion. However, the inversion converges after more than 20 iterations. The inversion results are close to those of the real models well.
Key words: marine controlled electromagnetic algorithm; Hankel transform; Gauss-Newton method; one-dimensional inversion
