(1. 中國海洋大學(xué) 海底科學(xué)與探測技術(shù)教育部重點(diǎn)實(shí)驗(yàn)室，青島 266100；
2. 中南大學(xué) 地球科學(xué)與信息物理學(xué)院，長沙 410012)
摘 要: 介紹一種海洋可控源電磁場一維反演方法，海洋可控源電磁一維正演是通過漢克爾變換求得的。采用正則化高斯-牛頓法對海洋可控源電場分量和磁場分量進(jìn)行反演。在一維典型海底高阻模型上進(jìn)行反演方法的正確性和有效性驗(yàn)證。結(jié)果表明：高斯-牛頓反演方法在反演初期收斂很快，數(shù)據(jù)擬合誤差在10次反演迭代內(nèi)即可下降到2.0左右，在反演后期收斂放緩并出現(xiàn)震蕩收斂現(xiàn)象；但在20多次迭代收斂，反演結(jié)果能較好指示高阻薄層的位置，與理論模型吻合較好。
關(guān)鍵字: 海洋可控源電磁法；漢克爾變換；高斯-牛頓法；一維反演
（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
