Fast geoelectrical modeling and imaging based on multigrid quasi-linear approximation and electromagnetic migration
- 出版日期：2007.
- 页数：1 online resource.
- 第一责任说明：Takumi Ueda.
- 分类号：a261 ; a630
MARC全文
62h0047118 20131202104350.0 cr an |||||||| 131023s2007 a fsbm |000|0 eng | 3249965 CNY371.35 NGL eng NGL a261 ; a630 Ueda, Takumi. Fast geoelectrical modeling and imaging based on multigrid quasi-linear approximation and electromagnetic migration [electronic resource] / Takumi Ueda. 2007. 1 online resource. Description based on online resource; title from title page (viewed Oct. 23, 2013) Thesis (Ph.D.)--The University of Utah, 2007. Includes bibliographical references. In recent years, interest has been markedly increasing in the electromagnetic method for offshore petroleum exploration, especially for the method which uses a controlled electromagnetic source the marine controlled source electromagnetic MCSEM) method). The interpretation of MCSEM data requires numerous three-dimensional 3-D) modelings of the responses in the receivers for different geoelectrical models of complex sea-bottom geological formations. This task may be extremely expensive even on modern computers. In order to overcome this significant difficulty, a new approach to both forward modeling and inversion of MCSEM data is introduced in this dissertation. For fast modeling, an application of the quasi-linear QL) approximation for the integral equation IE) method in the framework of the multigrid method is introduced, and a capability of fast modeling without losing accuracy especially for MCSEM data is demonstrated. As a new effective inversion, novel ideas of electromagnetic EM) migration are applied to the interpretation of a typical MCSEM survey and are successfully developed. The principles of the migration imaging and iterative migration are formulated and implemented in the corresponding computer code. The developed modeling and inversion schemes have been tested using synthetic problems and practical data collected at the Gemini prospect, the Gulf of Mexico, and in the Troll West Gas Province of the North Sea. The results demonstrate that the MGQL approximation provides a fast and accurate solution for numerical modeling of the multitransmitter EM data in complex 3-D geoelectrical structures with lesser cost than a standard IE solution. The results of EM migration inversion show that migration can be treated as an efficient prospective method of MCSEM data interpretation. Magnetism. ; Prospecting Geophysical methods ; Mathematical models. Electronic dissertations local. aInternet resource. aCN b010001 http://pqdt.bjzhongke.com.cn/Detail.aspx?pid=Bf9qqNkjZBU%3d 010001 Bs2737 rCNY371.35 ; h1 bs1310