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SUBSURFACE GEOLOGY OF THE MIOCENE GHARANDAL GROUP IN THE SOUTH BAKR OILFIELD, GULF OF SUEZ, EGYPT
Author(s) -
Elzarka Mohamed Hossny,
Wally Mokhless M.
Publication year - 1986
Publication title -
journal of petroleum geology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.725
H-Index - 42
eISSN - 1747-5457
pISSN - 0141-6421
DOI - 10.1111/j.1747-5457.1986.tb00391.x
Subject(s) - geology , facies , evaporite , deposition (geology) , group (periodic table) , structural basin , geochemistry , subsidence , geothermal gradient , paleontology , geomorphology , chemistry , organic chemistry
The mineralogical composition of the Miocene Gharandal group has been studied petrographically, and has been confirmed by chemical analyses and Differential Thermal and X‐Ray Diffraction analyses (DTA andXRDA). These investigations have been supplemented by geological mapping, which has revealed the geological setting and paleoenvironmental conditions of the Lower Miocene Gharandal group at the South Bakr oilfield. The lithic association of the Nukhul and Rudeis formations indicates that deposition took place in a shallow‐marine environment in the sublittoral zone. The mineral association of the rocks of the Kareem Formation suggests a semirestricted environment, where the chemical conditions changed from weakly‐oxidising to slightly reducing during the deposition of these sediments. The lithic association of the rocks of the Kareem Formation indicates that their deposition occurred in a barred basin. The basin was affected by gentle subsidence, which might be associated with post Early Miocene growth‐faulting in its western section. The rocks of the Gharandal group represent the lower section of an evaporite cycle of deposition. The structure and variation of the thickness and facies has led the Authors to present some deductions concerning the paleoenvironmental conditions under which the investigated rocks were formed.