The impact of the early cretaceous igneous intrusion in the Falkland Plateau Basin

27 de novembro de 2019

The Falkland Plateau Basin is an sedimentary basin to the east of the Falkland Islands. The basin was created during the Gondwana breakup, on the Middle Jurassic, and was exposed to extensional forces during the South Atlantic Ocean opening. A system of magmatic intrusions are affecting the basin and date from the Early Cretaceous. The study of these features allows the comprehension of the basin formation as well as assess about the implication on the petroleum system. Eight horizons were interpreted and there were identified 92 magmatic intrusions forming sills. The geometries of the intrusions depend on the depth of emplacement. In greater depths, more planar tend to be the sills. The deeper sills are feeding magma to the upper layers by exploiting fractures. It is also possible to see two points where the magma extrudes, covering most part of the South-East area of the seismic volume. Since these intrusions are contained in a package of black shale with a highly petroliferous potential dated from Upper Jurassic to Early Cretaceous, they could have contributed to the maturation of the source rocks in the basin. It was performed a Basin modelling study, by using a 1D basin model and it was fit to a set of pseudo-wells inside the seismic volume, in order to infer the maturation of the source-rock for the volume. The results show a peak of maturation when the intrusions where emplaced, but the general influence in nowadays maturation is not that visible.

Autores da comunidade :

• 

  A

  Ana Filipa Dâmaso Duarte

  ist178668

  Afiliações e fontes

  De: orcid

  ID: 123866819

Orientadores desta instituição:

• 

  L

  Leonardo Azevedo Guerra Raposo Pereira

  ist168809

Master's in Petroleum Engineering

earth-and-related-environmental-sciences - Ciências da Terra e Ciências do Ambiente

eng - Inglês

Instituto Superior Técnico