Early and Late Surficial Kaolinite Cements: Constrains in a Paleo Petroleum System, Cameros Basin, Spain

Arribas, José and Herrero, María J. and Ochoa, María and Omodeo-Salé, Silvia and Escavy, José Ignacio (2017). Early and Late Surficial Kaolinite Cements: Constrains in a Paleo Petroleum System, Cameros Basin, Spain. In: "International Meeting of Sedimentology 2017 33rd IAS & 16th ASF Joint Meeting", 10-12 Octubre 2017, Toulouse, Francia. p. 52.

Description

Title: Early and Late Surficial Kaolinite Cements: Constrains in a Paleo Petroleum System, Cameros Basin, Spain
Author/s:
  • Arribas, José
  • Herrero, María J.
  • Ochoa, María
  • Omodeo-Salé, Silvia
  • Escavy, José Ignacio
Item Type: Presentation at Congress or Conference (Other)
Event Title: International Meeting of Sedimentology 2017 33rd IAS & 16th ASF Joint Meeting
Event Dates: 10-12 Octubre 2017
Event Location: Toulouse, Francia
Title of Book: 33rd International Meeting of Sedimentology 16ème Congrès Français de Sédimentologie Abstract Book
Date: 2017
Subjects:
Faculty: E.T.S.I. Caminos, Canales y Puertos (UPM)
Department: Ingeniería y Morfología del Terreno
Creative Commons Licenses: Recognition - No derivative works - Non commercial

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Abstract

Several types ofkaolinite textures appearing in Cretaceous sandstones from the intracratonic Cameros Basin (Spain) permit to outline the unconformity between syn-and post-tectonic units. The Cameros Basin is an inverted extensional basin (North-Central Spain) infilled from Tithonian to Early Albian times. During its evolution, a petroleum system was developed in the southern area of the basin. The reservoir of the system is the post-extensional Utrillas Fm. (Middle Albian), where common bitumen accumulations (tar sands) are found. The source rock of this paleo-petroleum system is still controversial. Abundant bitumen residues have been found in the last basin infill clastic units (Valanginian - Early Aptian, Abejar Fm.), which have been considered as oil-carrier beds. The Abejar Fm. is composed ofarkosic sandstones with a diagenetic history consisting ofmechanical and chemical compaction, kaolinite pore-filling and epimatrix derived from K-feldspars alteration, quartz overgrowth, and secondary porosity generation by feldspar dissolution. The porosity is primary and secondary in origin. Kaolinite pore-filling appears as the latest diagenetic process affecting sandstones during telodiagenetic stage (basin uplift). This last cement occurs as pale to dark orange in color with a texture of clay coats covering primary and secondary pore walls, growing over quartz cement crystal faces. Textures denote that this cement grew in a vadose environment, containing abundant ghosts ofbacteria and fungí. These kaolinite "cutans" appear to be locally impregnated in bitumen, suggesting the role as oil pathway ofthe syn-extensional sandstones during oíl migration. The reservoir of the paleo-petroleum system (Utrillas Fm.) is constituted by sandstone channels interbedded with shales. Locally, porosity in the Middle Albian sandstones is almost totally occluded by homogeneous bitumen pore fillings. In these deposits, quartz cement was not developed, indicating that bitumen accumulation occurred in an early diagenetic stage. Sandstone diagenesis reveals early kaolinite cements with severa! textures occluding primary pores. A first stage of cementation occurs as grain coats with the development of orange kaolinite laminae with meniscus textures, suggesting a vadose origin in an eodiagenetic environment. These textures are very similar to the late kaolinite cement in the Abejar Fm. sandstones. In addition, a second kaolinite pore-filling with typical palette aggregates occluded remnant primary pares. Finally, calcite cement replaces kaolinite as a late diagenetic process in the Utrillas Fm.Such a variety of kaolinite textures in the Abejar and Utrillas Fms. demonstrates differences in the timing of kaolinite precipitation (telodiagenetic and eodiagenetic, respectively), outlining the unconformity between syn-and post-extensional stages in the Cameros Basin.

Funding Projects

TypeCodeAcronymLeaderTitle
Government of SpainCGL2011-22709DGICCYTMaría Isabel Benito MorenoLa influencia marina en el registro de la Cuenca de Cameros (Jura. sup.-Creta. inf.): ¿Más que esporádicas incursiones del mar? Implicaciones paleogeográficas y paleoclimáticas.

More information

Item ID: 50921
DC Identifier: http://oa.upm.es/50921/
OAI Identifier: oai:oa.upm.es:50921
Official URL: https://ims2017.sciencesconf.org/data/IMS_2017_Abstracts_book.pdf
Deposited by: Memoria Investigacion
Deposited on: 23 May 2018 16:13
Last Modified: 23 May 2018 16:17
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