基于梯度点乘约束的震电重资料联合反演研究

The main difficulties of the joint inversion of the different kinds of geophysical data is the complexity and fuzzy relationship between different types of physical parameters.One of the traditional joint inversion methods is the direct parameter relations method which specify the functional relationship between different physical parameters；the other is the joint inversion method with the structural cross-gradient constraints first proposed by Gallardo & Meju in 2003, which does not directly specifythe relationship between the physical parameters of the function, and has made a substantial progress to the joint inversion method. However, the calculation complex of the cross-gradient make it inconvenient to implementat joint inversion. Therefore, in order to meet the actual needs of the joint inversion，based on the joint inversion method of 2D seismic and MT data with dot-gradient constraints ,which was proposed by Molodtsov in 2011,and here be extend and modify, and by using the separate forward simulation grid and inversion grid, the 3D joint inversion of seismic and MT and gravity data with dot-gradientconstraints will be realized in order to promote the new development of the joint inversion.Then new developed method will be used to the Wenzhou, Zhejiang, Shanxi Reservoir area area, due to the reservoir earthquakes, which is highly concerned about subject to the relevant departments and local residents in recent years.Thus through the studying on theoretical methods and real examples, the goals to provide a new foundation for the ways and means of joint inversion can to be achieved .

不同种类物性参数之间的复杂和模糊关系是多种地球物理数据联合反演的主要困难。目前传统联合反演方法是利用不同物性参数之间的关系直接进行反演，较新的是2003年Gallardo 等首次提出的梯度叉积结构约束联合反演法，它不直接指定不同物性参数之间的关系，使联合反演取得了实质性进展。但它计算复杂，不方便联合反演的实施。最新的是Molodtsov 等于2011年底对地震和MT两种资料提出的梯度点积约束2D 联合反演，该方法相对简单且效果更好。为满足联合反演的实际需求，本申请在此基础上，将梯度点积结构约束进行扩展和修改，提出正演模拟网格和反演网格相分离的正则化网格技术，以实现梯度点积约束的地震、MT和重力三种资料的3D联合反演，使联合反演获得新发展，并将所发展的新方法应用于近年来因水库地震受有关部门和当地居民高度关注的温州珊溪水库地区。从而通过本方法的理论和实例研究，为联合反演研究提供新的途径和基础。

不同种类物性参数之间的复杂和模糊关系是多种地球物理数据联合反演的主要困难。目前传统联合反演方法是利用不同物性参数之间的关系直接进行反演，较新的是2003年Gallardo 等首次提出的梯度叉积结构约束联合反演法，它不直接指定不同物性参数之间的关系，使联合反演取得了实质性进展。但它计算复杂，不方便联合反演的实施。最新的是Molodtsov 等于2011年底对地震和MT两种资料提出的梯度点积约束的联合反演，该方法相对简单且效果更好。为满足联合反演的实际需求，本项目在此基础上，将梯度点积结构约束进行扩展和修改，实现梯度点积约束的地震、MT和重力三种资料的联合反演。并应用于近年来因水库地震受有关部门和当地居民高度关注的温州珊溪水库地区。从而通过本方法的理论和实例研究，为联合反演研究提供新的途径和基础。.本项目共观测MT数据30个，重力数据626个，并整理了珊溪库区近10年来的地震资料、定位，并分别对它们进行了单独反演，并进行的可能的联合反演试验。