Correction of the anisotropy in resistivity: application to pore pressure prediction

Detalhes bibliográficos
Autor(a) principal: Teca, Dário Bokiló Machado
Data de Publicação: 2014
Tipo de documento: Dissertação
Idioma: eng
Título da fonte: Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
Texto Completo: http://hdl.handle.net/10362/13132
Resumo: Dissertação para obtenção do Grau de Mestre em Engenharia Geológica (Georrecursos)
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spelling Correction of the anisotropy in resistivity: application to pore pressure predictionOil reservoirFluids pressureResistivity logsGeological formation anisotropyCorrection of resistivityDissertação para obtenção do Grau de Mestre em Engenharia Geológica (Georrecursos)This dissertation is based on a curricular training period done at company Total EP Angola between July and December 2013. The data presented relate to a real case study of an exploration block, which for reasons of confidentiality is designated by Block Michocho. The fluids pressure measurement in the geological formations can be inferred from the formation resistivity log. In not perpendicular wells to the layers, resistivity curves show higher values than the expected due to the anisotropic effect of the formation thus the inference of the pressure of fluids from resistivity logs can lead to unrealistic values. Most of the developments wells drilled on Block Michocho in Angola are highly deviated, if not sub-horizontal, in the reservoir section. The objective of this work is to correct the anisotropic effect of the resistivity of Block Michocho due to non-perpendicularity of the wells when intersect the geological formations. In this study, the correction of the resistivity is based on the formula proposed by Moran and Gianzero in 1979 and involves the dipping angle of the induction logging tool and the coefficient of anisotropy of the rock formation. Prior to application of this formula for the corrections of resistivity of the Block Michocho wells logs, a set of validation tests were made. Due to lack of data on development wells (highly inclined wells) the validation test was carried out in five exploration wells where resistivity is available in the two principal directions. It was assumed that the formula would be approved for resistivity corrections if the horizontal resistivity obtained by the formula had a good correspondence with the horizontal resistivity obtained by the induction logging tool. After this validation step, the coefficient of anisotropy to be used in the formula was calibrated as well as the correction of the curves of resistivity of the remaining development wells, those much more diverted regarding the rock layers. The corrected resistivity can be applied for pore pressure prediction in low permeability rock formations, in which the main objective is to identify regions where fluid pressure is higher than normal pressure, i.e. overpressure regions. For illustration purposes, a resistivity curve from an exploration well was chosen and the pressure of the fluids in low permeability rocks was computed by using the formula proposed by Eaton in 1975. With this well data, a potential overpressure region was identified and should be avoided in drilling activities.Faculdade de Ciências e TecnologiaAlmeida, José António deCornu, TristanRUNTeca, Dário Bokiló Machado2014-09-23T15:44:52Z20142014-01-01T00:00:00Zinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/masterThesisapplication/pdfhttp://hdl.handle.net/10362/13132enginfo:eu-repo/semantics/openAccessreponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãoinstacron:RCAAP2024-03-11T03:47:54Zoai:run.unl.pt:10362/13132Portal AgregadorONGhttps://www.rcaap.pt/oai/openaireopendoar:71602024-03-20T03:21:06.440552Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãofalse
dc.title.none.fl_str_mv Correction of the anisotropy in resistivity: application to pore pressure prediction
title Correction of the anisotropy in resistivity: application to pore pressure prediction
spellingShingle Correction of the anisotropy in resistivity: application to pore pressure prediction
Teca, Dário Bokiló Machado
Oil reservoir
Fluids pressure
Resistivity logs
Geological formation anisotropy
Correction of resistivity
title_short Correction of the anisotropy in resistivity: application to pore pressure prediction
title_full Correction of the anisotropy in resistivity: application to pore pressure prediction
title_fullStr Correction of the anisotropy in resistivity: application to pore pressure prediction
title_full_unstemmed Correction of the anisotropy in resistivity: application to pore pressure prediction
title_sort Correction of the anisotropy in resistivity: application to pore pressure prediction
author Teca, Dário Bokiló Machado
author_facet Teca, Dário Bokiló Machado
author_role author
dc.contributor.none.fl_str_mv Almeida, José António de
Cornu, Tristan
RUN
dc.contributor.author.fl_str_mv Teca, Dário Bokiló Machado
dc.subject.por.fl_str_mv Oil reservoir
Fluids pressure
Resistivity logs
Geological formation anisotropy
Correction of resistivity
topic Oil reservoir
Fluids pressure
Resistivity logs
Geological formation anisotropy
Correction of resistivity
description Dissertação para obtenção do Grau de Mestre em Engenharia Geológica (Georrecursos)
publishDate 2014
dc.date.none.fl_str_mv 2014-09-23T15:44:52Z
2014
2014-01-01T00:00:00Z
dc.type.status.fl_str_mv info:eu-repo/semantics/publishedVersion
dc.type.driver.fl_str_mv info:eu-repo/semantics/masterThesis
format masterThesis
status_str publishedVersion
dc.identifier.uri.fl_str_mv http://hdl.handle.net/10362/13132
url http://hdl.handle.net/10362/13132
dc.language.iso.fl_str_mv eng
language eng
dc.rights.driver.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.publisher.none.fl_str_mv Faculdade de Ciências e Tecnologia
publisher.none.fl_str_mv Faculdade de Ciências e Tecnologia
dc.source.none.fl_str_mv reponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação
instacron:RCAAP
instname_str Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação
instacron_str RCAAP
institution RCAAP
reponame_str Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
collection Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
repository.name.fl_str_mv Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação
repository.mail.fl_str_mv
_version_ 1799137852030713856

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