Please use this identifier to cite or link to this item:
|Title:||Geochemical Considerations from the Carboniferous Unconventional Petroleum System of SW Iberia||Authors:||Barberes, Gabriel A.
Reis, Rui Pena dos
Pimentel, Nuno L.
Spigolon, André L. D.
Fonseca, Paulo E.
Azevedo, Marco C.
Barata, Maria Teresa
|Keywords:||geochemistry; South Portuguese Zone; shale gas; vitrinite reflectance; total organic carbon; carboniferous;; unconventional petroleum system||Issue Date:||2021||Project:||CNPq (Brazil)
|Serial title, monograph or event:||Minerals||Volume:||11||Issue:||8||Abstract:||The Baixo Alentejo Flysch Group (BAFG) is an important stratigraphic unit that covers over half of the South Portuguese Zone (SPZ) depositional area, and it is composed by three main tectono-stratigraphic units: the Mértola, Mira, and Brejeira formations. All of these formations contain significant thicknesses of black shales and have several wide areas with 0.81 wt.%, 0.91 wt.%, and 0.72 wt.% average total organic carbon (TOC) (respectively) and thermal maturation values within gas zones (overmature). This paper is considering new data from classical methods of organic geochemistry characterization, such as TOC, Rock–Eval pyrolysis, and organic petrography, to evaluate the unconventional petroleum system from the SPZ. A total of 53 samples were collected. From the stratigraphical point of view, TOC values seem to have a random distribution. The Rock– Eval parameters point out high thermal maturation compatible with gas window (overmature zone). The samples are dominated by gas-prone extremely hydrogen-depleted type III/IV kerogen, which no longer has the potential to generate and expel hydrocarbons. The petrographic analyses positioned the thermal evolution of these samples into the end of catagenesis to metagenesis (wet to dry gas zone), with values predominantly higher than 2 %Ro (dry gas zone). The presence of thermogenic hydrocarbon fluids characterized by previous papers indicate that the BAFG from SPZ represents a senile unconventional petroleum system, working nowadays basically as a gas reservoir.||URI:||http://hdl.handle.net/10316/100801||ISSN:||2075-163X||DOI:||10.3390/min11080811||Rights:||openAccess|
|Appears in Collections:||FCTUC Ciências da Terra - Artigos em Revistas Internacionais|
Show full item record
Files in This Item:
|Geochemical-considerations-from-the-carboniferous-unconventional-petroleum-system-of-sw-iberiaMinerals.pdf||3.99 MB||Adobe PDF||View/Open|
This item is licensed under a Creative Commons License