RT Journal Article
T1 Diagenesis, carbonate cementation and resevoir quality evolution of Eocene deep-water marine turbidite sandstones of the HechoGroup, South-Central Pyrenees
A1 Caja Rodríguez, Miguel Ángel
A1 Marfil Pérez, Rafaela
A1 García, D.
A1 Mansurbeg, H.
A1 Remacha, E.
AB Sandstone turbidites from the Hecho Group in the South-Central Pyrenees are considered exceptional examples for reservoir modelling and outcrop analogous studies. The Hecho Group is divided into four major tectosedimentary units (TSU-2 to TSU-5) and the sandstone composition varies from quartzarenites to arkoses (TSU-2), lithoarenites to hybrid arenites (TSU-3 and TSU-4), and hybrid arenites (rich in carbonate bioclasts; TSU-5). In TSU-2, the lowermost and most deformed unit, calcite cement precipitation was related to tectonic deformation. In the other turbidite systems (TSU-3, 4 and 5) eodiagenesis is evidenced by precipitation of dolomite cement and pyrite, which are locally abundant in all sandstones. Overall, compaction was more important than cementation in destroying porosity. However, the precipitation of dolomite overgrowth and intragranular mesogenetic ferroan calcite occluded nearly completely the remaining porosity and halted further compaction. Dissolution of calcite and dolomite cements has resulted in creation of minor amounts of secondary porosity.
PB Sociedad Geológica de España.
SN 1576-5172
YR 2006
FD 2006
LK https://hdl.handle.net/20.500.14352/52436
UL https://hdl.handle.net/20.500.14352/52436
LA eng
NO European Science Foundation
NO Ministerio de Educación, Cultura y Deportes (MECD)
DS Docta Complutense
RD 18 abr 2025