Analyse quantitative de fracturation des calcaires ypresiens en Tunisie; l'exemple de jebel Ousselat

Abstract

Field studies performed on the well developed fracture system affecting the Ypresian carbonate series of the nummulitic El Gueria Formation and the Globigerinae Bou Dabbous Formation (Jebel Ousselat; Central Tunisia), has led to a better understanding of the effect of fracture systems on the general petrophysical parametres (porosity and permeability) of these two proven petroleum reservoir systems. In this study, we were able to assess a comprehensive quantitative method integrating many parametres such as: major and minor fault trending systems, fracture density and frequency of each fracture system. Results obtained from applying this methodology attest that fracture system analysis should be necessarily integrated in the general approach for estimating reservoir qualities of similar deposits in Tunisia.

Comparative study between Rock-Eval pyrolysis and biomarkers parameters: A case study of Ypresian source rocks in central-northern Tunisia

“…4) (Boukadi et al, 2000). Within the Metlaoui Formation, three different facies can be distinguished from bottom to top (Rigane et al, 1994): microcrystalline limestones with small pelagic and benthic foraminifera (Bou Dabbous source rock, I), bioclastic and nummulithoclastic limestones (transition facies, II) and massive crystalline limestones with large nummulites (El Garia reservoir, III).…”

“…Ypresian facies distribution in West of Kairouan and the location of Es-Sfeı¨a, Chaker, and Serj Jebels (afterBoukadi et al, 2000).…”

Geochemical Characterization Given by Rock‐Eval Parameters and N‐alkanes Distribution on Ypresian Organic Matter at Jebel Chaker, Tunisia

“…The Lower Eocene outcrops of Jebel Chaker are located in central‐northern Tunisia. These outcrops represent the eastern part of the Ypresian basin, which is situated approximately 40 km east of Kairouan city (Boukadi et al , 2000; Fig. 2[link]).…”

“…The west of Kairouan manifests a carbonatic magasequence surrounded by Palaeocene clays (El Haria Formation) at the base and Lutetian‐Priabonian marls (Souar Formation) at the top (Boukadi et al , 2000). Within the Metlaoui Formation, three different facies can be distinguished from bottom to top (Rigane et al , 1994): microcrystalline limestones with small pelagic and benthic foraminifera (Bou Dabbous source rock, I), bioclastic and nummulithoclastic limestones (transitory facies, II) and massive crystalline limestones with large nummulites (El Garia reservoir, III; Fig.…”

Quatre abris peints découverts au Jebel Ousselat (Tunisie centrale)

“…Les calcaires sont plus massifs au sud qu'au nord, où les divers bancs s'individualisent bien. L'ancienne surface structurale a fait place à des crêtes et à des échines sinueuses (Boukadi et al 2000).…”