Home / Vol. 24 (2019)

MICROFACIES ANALYSIS AND PALEOENVIRONMENTAL TRENDS OF THE PALEOCENE FARRUD AND MABRUK RESERVOIRS, CONCESSION 11, WEST SIRT BASIN, LIBYA

Nisreen Agha, Amin Gheith, Salah El-Beialy, Haitham El-Atfy, Waleed Shukri

Libya
Egypt

DOI: 10.68482/prj.2019.24.003 · Published Dec 2019 · Section: Exploration · Pages: 17–35

Abstract

Investigation of thin sections taken from representative core samples under the petrological microscope reveals common petrographic and mineralogical characteristics with distinct faunal assemblages allow establishing the microfacies associations and deducing the paleoenvironmental trends of the Paleocene Farrud and Mabruk rock units. Recognition of the early and post diagenetic processes particularly dolomitization and micritization as well as dissolution and precipitation of spary drusy calcite as a newmorphism process affecting the reservoir rocks is established. The microfacies trends detected from the investigation of 46 core samples from Farrud Member (Lower Paleocene) representing six wells; QQQ1-11, GG1-11, LLL1-11, RRR1-11, RRR40-11 and RRR45-11 indicate that the deposition was started within the realm of shallow supratidal and intertidal subenvironments followed by deeper environments of the shelf bays with maximum sea level during inner shelf environment where fossiliferous bioclastic packstone dominated. The microfacies associations determined in 8 core samples from two wells LLL1and RRR40 representing Mabruk Member (Upper Paleocene) indicate paleoenvironmental trends marked by sea level fluctuations accompanied with a relatively marine shelf bay conditions intervened with short-lived shallow intertidal and supratidal warm coastal sedimentation. As a result dolostone, evaporitic dismicrites and gypsiferous dolostone of supratidal characters were deposited.

Keywords

Farrud and Mabruk memebers, Paleocene, microfacies associations, diagenesis, sea level oscillation, dpositional  environments

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