Two dimensional combined inversion of short- and long-normal dc resistivity well log data

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dc.authoridUlugergerli, Emin Ugur/0000-0001-5639-1109
dc.contributor.authorUlugergerli, Emin U.
dc.date.accessioned2025-01-27T20:58:06Z
dc.date.available2025-01-27T20:58:06Z
dc.date.issued2011
dc.departmentÇanakkale Onsekiz Mart Üniversitesi
dc.description.abstractA method is presented for the two-dimensional combined inversion of short- and long-normal tool direct current resistivity data with symmetry. The forward problem is solved using the finite element method in the cylindrical coordinates system. The inverse problem is solved using a conjugate gradient technique with the partial derivatives obtained using reciprocity. The parameters were obtained by means of both conjugate gradient relaxation and conventional conjugate gradient method. The solution of this highly under-determined inverse problem is stabilized using Tikhonov regularization and the scheme yields a blurred image of the subsurface. The scheme is tested using synthetic data and field data. Tests using synthetic data suggest that traces of the horizontal boundaries are delineated in the range of the exploration distance while the resolution of vertical boundaries depends upon the solution regularization. Application to field data shows that additional information is necessary for resolving the resistivity structure when there are low resistivity contrasts between formation units. (C) 2010 Elsevier B.V. All rights reserved.
dc.identifier.doi10.1016/j.jappgeo.2010.12.004
dc.identifier.endpage138
dc.identifier.issn0926-9851
dc.identifier.issn1879-1859
dc.identifier.issue2
dc.identifier.scopus2-s2.0-79651473813
dc.identifier.scopusqualityQ2
dc.identifier.startpage130
dc.identifier.urihttps://doi.org/10.1016/j.jappgeo.2010.12.004
dc.identifier.urihttps://hdl.handle.net/20.500.12428/26609
dc.identifier.volume73
dc.identifier.wosWOS:000288525600005
dc.identifier.wosqualityQ1
dc.indekslendigikaynakWeb of Science
dc.indekslendigikaynakScopus
dc.language.isoen
dc.publisherElsevier
dc.relation.ispartofJournal of Applied Geophysics
dc.relation.publicationcategoryinfo:eu-repo/semantics/openAccess
dc.rightsinfo:eu-repo/semantics/closedAccess
dc.snmzKA_WoS_20250125
dc.subjectWell-logging
dc.subjectDirect current resistivity
dc.subject2D inversion
dc.subjectFinite element method
dc.titleTwo dimensional combined inversion of short- and long-normal dc resistivity well log data
dc.typeArticle

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