2.5维海洋可控源电磁反演算法及影响参数研究  

2.5D inversion algorithm and parameters of marine controlled-source electromagnetic method

作　　者：陈光源[1,2] 杜立彬[1,2] 景建恩[3] 吴凯[4] 邓明[3] 陈凯[3] 

机构地区：[1]山东省科学院海洋仪器仪表研究所,青岛266001 [2]山东省海洋环境监测技术重点实验室,青岛266001 [3]中国地质大学(北京),北京100083 [4]中国科学院电子学研究所,北京100190

出　　处：《地球物理学进展》2016年第4期1796-1802,共7页Progress in Geophysics

摘　　要：海洋可控源电磁法作为一种较新的地球物理勘探方法,在国外已被成功应用于海洋油气资源与天然气水合物的探测中,而我国在这方面的研究开始较晚.本文编写了基于非线性共轭梯度算法的海洋可控源电磁2.5维反演程序,结合理论数据对反演代码的正确性进行验证并讨论了反演参数对反演运算速度及效果的影响.研究结果表明,1)本文编写的2.5维反演程序正确可靠,计算结果与理论模型一致,2)在非线性共轭梯度反演计算中,正则化因子、预条件矩阵、线性搜索及共轭梯度更新因子等参数对实际的反演速度及精度都存在一定影响,可根据不同的勘探需求,调整反演参数以达到较好的反演结果.As a new geophysical exploration method, Marine controlled-source electromagnetic method has been intensively studied and successfully applied into marine hydration and gas hydrate resource detection abroad. This study in China began later than the foreign countries and short for effective inversion method for2. 5-dimensional problem. This paper written a 2. 5-dimensional code cored by the nonlinear conjugate gradients algorithm and the forward method adopted the adaptive finite element method. The synthetic and measured data were applied to prove the code ’s validity and affectivity. The conclusion was drawn that the 2. 5-dimensional inversion code was correct and effective and the inversion result is consist with other geophysical exploration method.This code has merits as high calculation rate and inversion resolution that could provide with a good way to study the 2-dimensional conductivity distribution under the seafloor.

关 键 词：海洋可控源电磁法 非线性共轭梯度 正则化因子 预条件矩阵 线性搜索 梯度更新方向 

分 类 号：P631[天文地球—地质矿产勘探] P738[天文地球—地质学]