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OMICS Group Contact us at: OMICS Group International through its Open Access Initiative is committed to make genuine and.

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Presentation on theme: "OMICS Group Contact us at: OMICS Group International through its Open Access Initiative is committed to make genuine and."— Presentation transcript:

1 OMICS Group Contact us at: contact.omics@omicsonline.org OMICS Group International through its Open Access Initiative is committed to make genuine and reliable contributions to the scientific community. OMICS Group hosts over 400 leading-edge peer reviewed Open Access Journals and organizes over 300 International Conferences annually all over the world. OMICS Publishing Group journals have over 3 million readers and the fame and success of the same can be attributed to the strong editorial board which contains over 30000 eminent personalities that ensure a rapid, quality and quick review process. OMICS Group signed an agreement with more than 1000 International Societies to make healthcare information Open Access.

2 OMICS Group welcomes submissions that are original and technically so as to serve both the developing world and developed countries in the best possible way. OMICS Journals are poised in excellence by publishing high quality research. OMICS Group follows an Editorial Manager® System peer review process and boasts of a strong and active editorial board. Editors and reviewers are experts in their field and provide anonymous, unbiased and detailed reviews of all submissions. The journal gives the options of multiple language translations for all the articles and all archived articles are available in HTML, XML, PDF and audio formats. Also, all the published articles are archived in repositories and indexing services like DOAJ, CAS, Google Scholar, Scientific Commons, Index Copernicus, EBSCO, HINARI and GALE. For more details please visit our website: http://omicsonline.org/Submitmanuscript.php http://omicsonline.org/Submitmanuscript.php OMICS Journals are welcoming Submissions

3 Dr. Jing-Bo Chen Professor Institute of Geology and Geophysics Chinese Academy of Sciences Beijing China

4 Biography Jing-Bo Chen received a B.S. (1990) in mathematics from Heibei University in China and a Ph.D. (2001) in computational mathematics from the Academy of Mathematics and Systems Sciences, Chinese Academy of Sciences. In 2001–2002, he was a postdoctoral fellow at the Institute of Theoretical Physics, Chinese Academy of Sciences. He is now a professor at the Institute of Geology and Geophysics, Chinese Academy of Sciences.

5 Numerical modeling of seismic wave Seismic migration imaging Full waveform inversion Structure-preserving algorithms for differential equations Research interests

6 Seismic modeling plays an important role in exploration geophysics. High-order modeling schemes are in demand for practical reasons. Three kinds of high-order time discretizations: o Lax-Wendroff methods o Nyström methods o Splitting methods. Lax-Wendroff methods are based on the Taylor expansion and the replacement of high-order temporal derivatives by spatial derivatives. Nyström methods are simplified Runge-Kutta algorithms, and splitting methods comprise substeps for one-step computation. Numerical experiments show that the fourth-order Lax-Wendroff scheme is more efficient for short-time simulations while the fourth-order Nyström scheme and the third-order splitting scheme are more efficient for long-term computations. Seismic Modeling

7 Two main stages of seismic modeling are geological model building, and numerical computation of seismic response for the model. It describes the forward process of propagating waves from sources to scatterers down in the subsurface and back to the receivers. The quality of the computed seismic response is partly related to the type of model that is built. Therefore the model building approaches become equally important as seismic forward realization methods. Models are considered to be representations of real objects and can be 1D, 2D, or 3D. 1D models are usually generated at well locations to predict the seismic response of the geological model and further to investigate the link between the geological beds at the well to the real reflection seismic data (seismic to well tie analysis). Main stages of Seismic Modeling

8 Primary Concerns Primary concern in seismic modeling necessarily focuses on determination of the true subsurface medium. Clearly, the accuracy of this information significantly impacts all aspects of the exploration process. Even when we do not have a completely detailed visualization of what is below us, a reasonable concept can provide guidelines for surface acquisition that improves subsurface imaging. The underlying Earth model strongly influences what we must do to migrate the data successfully and produce an optimum image. Another primary concern focuses on which of the myriad available imaging algorithms has the best chance of producing the highest quality image. Making this choice requires an understanding of the most important such technology. Because algorithm development and implementation is a highly mathematical endeavor, acquiring this understanding can be quite difficult. A third concern arises from the fact that, in general, the Earth does not respond well to high frequency sources since high frequency sound waves are absorbed rather quickly. Depending on rock type they penetrate only to a few thousand meters. On the other hand, low frequency sound waves are known to provide narrow bandwidth images at depths in excess of 30 or 40 kilometers.

9 The two main approaches to seismic modeling produce models for the underground velocities: the first is a process called time migration, which takes seismic data in time coordinates, and produces images and time-migration velocities, which are an averaged velocity of a particular type. The second, depth migration, takes seismic data in depth coordinates and produces seismic images in depth coordinates. Time migration Depth migration Adequate for mild lateral velocity variation arbitrary velocity variation Implementation requires seismic dataseismic data + velocity model Produces images intime coordinatesdepth coordinates Approaches to Seismic Modeling

10 Time migration has the advantage that it is fast and efficient, however: It works best in areas where the seismic velocity depends only on the depth, in other words, the sound speed is constant along horizontal lines. However, most interesting phenomena, including the presence of underground oil, tend to occur in the areas where flat horizontal structures inside the earth are distorted; Tranforming these images and information from time coordinates to regular Cartesian (depth) coordinates is subtle and non-obvious in cases where the velocity is not horizontally constant and in fact depends on the lateral coordinates. In contrast, depth migration produces images in the regular Cartesian coordinates and can be applied when there is considerable lateral distortion in underground structures. However, one needs to start with seismic velocity in depth coordinates in order to apply depth migration: this seismic velocity is never known, and is typically found by "guessing and trying".

11 Geophysics & Remote Sensing Related Journals Geophysics & Remote Sensing Related Journals ISPRS Journal of Photogrammetry and Remote Sensing IEEE Transactions on Geoscience and Remote Sensing Applied Earth Observation and Geoinformation Photogrammetric Engineering and Remote Sensing ISPRS Journal of Photogrammetry and Remote Sensing IEEE Transactions on Geoscience and Remote Sensing Applied Earth Observation and Geoinformation Photogrammetric Engineering and Remote Sensing

12 International Conference on Earth Science & Climate Change Asian Conference on Remote Sensing International Conference on Remote Sensing in Archaeology International Conference on Remote Sensing IEEE Conference on Aerospace and Remote Sensing Technology International Conference on Earth Science & Climate Change Asian Conference on Remote Sensing International Conference on Remote Sensing in Archaeology International Conference on Remote Sensing IEEE Conference on Aerospace and Remote Sensing Technology Geophysics & Remote Sensing Related Conferences Geophysics & Remote Sensing Related Conferences

13 OMICS Group Open Access Membership OMICS publishing Group Open Access Membership enables academic and research institutions, funders and corporations to actively encourage open access in scholarly communication and the dissemination of research published by their authors. For more details and benefits, click on the link below: http://omicsonline.org/membership.php


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