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Volume :19 Issue : 1 1992      Add To Cart                                                                    Download

The sedimentology of the Lower Eocene Rus Formation of Qatar and neighboring regions

Auther : SAIF ALI AL-HAJARI* AND CHRISTOPHER G. ST. C. KENDALL+

*Department of Geology, University of Qatar, P.O. Box 2713, Doha, Qatar +Department of Geological Sciences, University of South Carolina, Columbia, South Carolina

29208, U.S.A.

 

ABSTRACT

 

The Lower Eocene Rus Formation generally overlies the Paleocene Umm er Radhuma Formation, and underlies the Middle Eocene Dammam Formation. It is present in the shallow subsurface throughout Qatar. Only the upper part is exposed at the surface and it is a major element of Qatars fresh-water aquifer.

 

The lithofacies and thickness of the Rus Formation are quite variable. More open marine facies are concentrated to the north while evaporite facies increase to the south and to the western, northern and eastern parts of Qatar offshore. A detailed study of the surfacesubsurface lithostratigraphy of the Rus has permitted its subdivision into three units: a dolomitic unit, an evaporite unit and a chalky limestone unit. Cores from well QDH25 show the general character of the Rus sequence. This indicates that it consists of sedimentary cycles that shallow upward, culminating in a typical sabkha-lagoon complex.

 

The original facies distribution and thickness of the units was influenced by structural movements persistent from the beginning of the Tertiary, and eustatic sea-level changes. Carbonate facies were deposited over structurally high areas while the evaporite facies were deposited in the structural lows.

 

The solution and removal of evaporites, at depth in the Rus Formation, subsequently produced numerous depressions which have changed landforms and created caverns, cavities, sinkholes and V-shaped structures. It has also caused the development of secondary porosity and permeability.

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