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dc.contributor.authorLu, Yongming
dc.contributor.authorLiu, Qiancheng
dc.date.accessioned2019-12-12T07:20:39Z
dc.date.available2019-12-12T07:20:39Z
dc.date.issued2019-11-26
dc.identifier.citationLu, Y., & Liu, Q. (2019). A comparison of two reflectivity parametrizations in acoustic least-squares reverse time migration. Exploration Geophysics, 1–14. doi:10.1080/08123985.2019.1682459
dc.identifier.doi10.1080/08123985.2019.1682459
dc.identifier.urihttp://hdl.handle.net/10754/660538
dc.description.abstractIn comparison with conventional reverse time migration (RTM), least-squares RTM (LSRTM) can improve imaging resolution and compensate irregular illumination caused by acquisition geometry and complex structures. Since proposed, as an advanced version of RTM, it has been applied a lot to improve resolution and balance amplitude in imaging. Generally, in LSRTM, there are two kinds of LSRTM reflectivity models: velocity perturbation related reflectivity model and normal-incidence reflection coefficient related reflectivity model. Each has its specific physical meaning and provides different inverted results. In this paper, we first give a brief review about the two different definitions. Then, we compare the differences of these two methods and build a mathematical relationship. In the definition related to reflection coefficient model, we rescale the defined reflectivity with background velocity. Also, in source wavefield reconstruction, we use an effective trick by moving file pointer to fetch data from disk to reduce the memory cost. Finally, we test these two LSRTM schemes using the Marmousi model. We observe that the two inverted reflectivities are different, although they both image the subsurface discontinuities well. We furthermore extract traces from the inversion results and compare them with the true reflectivity models, respectively, to verify the physical definitions of them.
dc.description.sponsorshipWe are grateful to Associate editor Jianxiong Chen and three reviewers for very kind comments and helpful suggestions which greatly improved the quality of our paper.
dc.publisherInforma UK Limited
dc.relation.urlhttps://www.tandfonline.com/doi/full/10.1080/08123985.2019.1682459
dc.rightsArchived with thanks to Exploration Geophysics
dc.titleA comparison of two reflectivity parametrizations in acoustic least-squares reverse time migration
dc.typeArticle
dc.contributor.departmentPhysical Science and Engineering (PSE) Division
dc.identifier.journalExploration Geophysics
dc.eprint.versionPost-print
dc.contributor.institutionDepartment of Earth and Space Sciences, Southern University of Science and Technology, Shenzhen, People's Republic of China
dc.contributor.institutionSchool of Earth and Space Sciences, University of Science and Technology of China, Hefei, People's Republic of China
kaust.personLiu, Qiancheng
refterms.dateFOA2019-12-15T05:37:06Z
dc.date.published-online2019-11-26
dc.date.published-print2020-03-03


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