Diagenetic processes in a partially dolomitized carbonate reservoir : Casablanca oil field, Mediterranean Sea, offshore Spain

Mesozoic and Neogene carbonates located in the Valencia Trough (offshore Spain, western Mediterranean Sea) are oil reservoirs. This paper investigates the diagenetic evolution of the Upper Jurassic limestones, currently dolomitized, that constitute the main reservoir of the Casablanca oil field. Cor...

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Autores: Rodríguez Morillas, Noelia, Playà i Pous, Elisabet, Travé i Herrero, Anna|||0000-0002-2735-3733, Martín-Martín, J. D.
Tipo de recurso: artículo
Fecha de publicación:2013
País:España
Institución:Universitat Autònoma de Barcelona
Repositorio:Dipòsit Digital de Documents de la UAB
Idioma:inglés
OAI Identifier:oai:ddd.uab.cat:107267
Acceso en línea:https://ddd.uab.cat/record/107267
https://dx.doi.org/urn:doi:10.1344/105.000001839
Access Level:acceso abierto
Palabra clave:Casablanca oil field
Dolomite reservoir
Vug and fracture porosity
Diagenesis
Mediterranean Sea
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spelling Diagenetic processes in a partially dolomitized carbonate reservoir : Casablanca oil field, Mediterranean Sea, offshore SpainRodríguez Morillas, NoeliaPlayà i Pous, ElisabetTravé i Herrero, Anna|||0000-0002-2735-3733Martín-Martín, J. D.Casablanca oil fieldDolomite reservoirVug and fracture porosityDiagenesisMediterranean SeaMesozoic and Neogene carbonates located in the Valencia Trough (offshore Spain, western Mediterranean Sea) are oil reservoirs. This paper investigates the diagenetic evolution of the Upper Jurassic limestones, currently dolomitized, that constitute the main reservoir of the Casablanca oil field. Core samples from Casablanca-1A well have been studied to determine the diagenetic products and their relation with porosity evolution, and to reconstruct the fluid flow history prior to and during oil emplacement. On the basis of petrological observations and geochemical analyses (major, minor and trace element composition and oxygen, carbon and strontium isotope composition), a major dolomitization event is recognized postdating subaerial exposure, erosion and karstification. The dolomitization event originated two replacive dolomites (RD1 and RD2) and two dolomite cements (saddle dolomite cement, SDC, and milky-white dolomite cement, MDC) which are partially cogenetic. RD1, RD2 and SDC precipitated at increasing temperatures (over 60ºC and below 110ºC), probably from meteoric water mixed with marine water. The last dolomite type (milky-white dolomite cement) precipitated with increasing burial conditions and by arrival of hydrothermal fluids during the Miocene. The post-dolomitization sequence comprises precipitation of calcite cement and partial calcitization of all previous dolomites. The oxygen, carbon and strontium isotope compositions suggest that this calcite cementation occurred from meteoric waters mixed with Burdigalian - Langhian marine waters trapped in the sediments and expelled by compaction in the moderate to deep burial realm. Normal faults were the conduits for upward migration of these fluids as well as for later oil expulsion from the Burdigalian - Langhian source rocks. Late corrosion associated with organic acid-enriched fluids took place prior or simultaneously to oil migration during the Pliocene, enhancing porosity and increasing reservoir quality.Consejo Superior de Investigaciones Científicas (Espanya). Group of Dynamics of the Lithosphere (GDL) 22013-01-0120132013-01-01Articlehttp://purl.org/coar/resource_type/c_6501VoRhttp://purl.org/coar/version/c_970fb48d4fbd8a85info:eu-repo/semantics/articleapplication/pdfhttps://ddd.uab.cat/record/107267https://dx.doi.org/urn:doi:10.1344/105.000001839reponame:Dipòsit Digital de Documents de la UABinstname:Universitat Autònoma de BarcelonaInglésengopen accesshttp://purl.org/coar/access_right/c_abf2Aquest document està subjecte a una llicència d'ús Creative Commons. Es permet la reproducció total o parcial, la distribució, la comunicació pública de l'obra i la creació d'obres derivades, sempre i quan aquestes es distribueixin sota la mateixa llicència que regula l'obra original i es reconegui l'autoria.https://creativecommons.org/licenses/by-sa/3.0/info:eu-repo/semantics/openAccessoai:ddd.uab.cat:1072672026-06-06T12:50:31Z
dc.title.none.fl_str_mv Diagenetic processes in a partially dolomitized carbonate reservoir : Casablanca oil field, Mediterranean Sea, offshore Spain
title Diagenetic processes in a partially dolomitized carbonate reservoir : Casablanca oil field, Mediterranean Sea, offshore Spain
spellingShingle Diagenetic processes in a partially dolomitized carbonate reservoir : Casablanca oil field, Mediterranean Sea, offshore Spain
Rodríguez Morillas, Noelia
Casablanca oil field
Dolomite reservoir
Vug and fracture porosity
Diagenesis
Mediterranean Sea
title_short Diagenetic processes in a partially dolomitized carbonate reservoir : Casablanca oil field, Mediterranean Sea, offshore Spain
title_full Diagenetic processes in a partially dolomitized carbonate reservoir : Casablanca oil field, Mediterranean Sea, offshore Spain
title_fullStr Diagenetic processes in a partially dolomitized carbonate reservoir : Casablanca oil field, Mediterranean Sea, offshore Spain
title_full_unstemmed Diagenetic processes in a partially dolomitized carbonate reservoir : Casablanca oil field, Mediterranean Sea, offshore Spain
title_sort Diagenetic processes in a partially dolomitized carbonate reservoir : Casablanca oil field, Mediterranean Sea, offshore Spain
dc.creator.none.fl_str_mv Rodríguez Morillas, Noelia
Playà i Pous, Elisabet
Travé i Herrero, Anna|||0000-0002-2735-3733
Martín-Martín, J. D.
author Rodríguez Morillas, Noelia
author_facet Rodríguez Morillas, Noelia
Playà i Pous, Elisabet
Travé i Herrero, Anna|||0000-0002-2735-3733
Martín-Martín, J. D.
author_role author
author2 Playà i Pous, Elisabet
Travé i Herrero, Anna|||0000-0002-2735-3733
Martín-Martín, J. D.
author2_role author
author
author
dc.contributor.none.fl_str_mv Consejo Superior de Investigaciones Científicas (Espanya). Group of Dynamics of the Lithosphere (GDL)
dc.subject.none.fl_str_mv Casablanca oil field
Dolomite reservoir
Vug and fracture porosity
Diagenesis
Mediterranean Sea
topic Casablanca oil field
Dolomite reservoir
Vug and fracture porosity
Diagenesis
Mediterranean Sea
description Mesozoic and Neogene carbonates located in the Valencia Trough (offshore Spain, western Mediterranean Sea) are oil reservoirs. This paper investigates the diagenetic evolution of the Upper Jurassic limestones, currently dolomitized, that constitute the main reservoir of the Casablanca oil field. Core samples from Casablanca-1A well have been studied to determine the diagenetic products and their relation with porosity evolution, and to reconstruct the fluid flow history prior to and during oil emplacement. On the basis of petrological observations and geochemical analyses (major, minor and trace element composition and oxygen, carbon and strontium isotope composition), a major dolomitization event is recognized postdating subaerial exposure, erosion and karstification. The dolomitization event originated two replacive dolomites (RD1 and RD2) and two dolomite cements (saddle dolomite cement, SDC, and milky-white dolomite cement, MDC) which are partially cogenetic. RD1, RD2 and SDC precipitated at increasing temperatures (over 60ºC and below 110ºC), probably from meteoric water mixed with marine water. The last dolomite type (milky-white dolomite cement) precipitated with increasing burial conditions and by arrival of hydrothermal fluids during the Miocene. The post-dolomitization sequence comprises precipitation of calcite cement and partial calcitization of all previous dolomites. The oxygen, carbon and strontium isotope compositions suggest that this calcite cementation occurred from meteoric waters mixed with Burdigalian - Langhian marine waters trapped in the sediments and expelled by compaction in the moderate to deep burial realm. Normal faults were the conduits for upward migration of these fluids as well as for later oil expulsion from the Burdigalian - Langhian source rocks. Late corrosion associated with organic acid-enriched fluids took place prior or simultaneously to oil migration during the Pliocene, enhancing porosity and increasing reservoir quality.
publishDate 2013
dc.date.none.fl_str_mv 2
2013-01-01
2013
2013-01-01
dc.type.none.fl_str_mv Article
http://purl.org/coar/resource_type/c_6501
VoR
http://purl.org/coar/version/c_970fb48d4fbd8a85
dc.type.openaire.fl_str_mv info:eu-repo/semantics/article
format article
dc.identifier.none.fl_str_mv https://ddd.uab.cat/record/107267
https://dx.doi.org/urn:doi:10.1344/105.000001839
url https://ddd.uab.cat/record/107267
https://dx.doi.org/urn:doi:10.1344/105.000001839
dc.language.none.fl_str_mv Inglés
eng
language_invalid_str_mv Inglés
language eng
dc.rights.none.fl_str_mv open access
http://purl.org/coar/access_right/c_abf2
https://creativecommons.org/licenses/by-sa/3.0/
dc.rights.openaire.fl_str_mv info:eu-repo/semantics/openAccess
rights_invalid_str_mv open access
http://purl.org/coar/access_right/c_abf2
https://creativecommons.org/licenses/by-sa/3.0/
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.source.none.fl_str_mv reponame:Dipòsit Digital de Documents de la UAB
instname:Universitat Autònoma de Barcelona
instname_str Universitat Autònoma de Barcelona
reponame_str Dipòsit Digital de Documents de la UAB
collection Dipòsit Digital de Documents de la UAB
repository.name.fl_str_mv
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