Some
sedimentary aspects and oil source-rock inferences of Sudr Formation,
northwest Sinai, Egypt
Ibrahim M. ElMansey and Mohammad A. K.
Barakat
Egyptian Petroleum Research Inst., Cairo, Egypt. |
Sudr Chalk Fm of Upper Cretaceous in Wadi
MatulIa, Sinai, Egypt, was studied in the field as well as petrographically, X-ray
analysis and its total organic carbon. Here Sudr Fm is subdivided into 4 rock units with
eight lithomicrofacies.
Its stratigraphic succession is represented at base by dolostones (gypsiferous,
fossiliferous), followed by an organic rich and reefal limestone unit. Phosphatic
limestone separates the lower unit from the overlying biomicrite which is composed mainly
of fossiliferous, pelagic and dolomitic limemuds (micrite).
The main diagenetic processes which affected these rock units are: Cementation,
compaction, replacement, recrystallization, dolomitization and pyritization.
Two depositional environments are recognized; the lower was non-agitated restricted
shore-line. and the upper was an open and deep marine conditions.
The data of total organic carbon (T.O.C) shows that Sudr Fm. at Wadi Matulla can be
considered as an excellent source rock.
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