Abstract
ABSTRACT The Khuff Formation in Abu Dhabi consists mainly of a thick shallow marine sequence of limestone, dolomite and subordinate anhydrite of Late Permian to Early Triassic age. The formation average thickness is about 2800 ft. and shows remarkable lateral consistency in lithology and log response that allow its correlation and sub-division into four major lithostratigraphic units, each of which is characterised by a specific lithofacies or lithofacies association. The formation depth of burial ranges between 11800 ft. and 19800 ft. subsea. The Khuff Formation is generally characterised by poor porosity and low matrix permeability. The porosity types are of primary and secondary origins and are controlled by original depositional facies, depth of burial and diagenesis. Fractures are common in the section and have a significant impact on enhancing the effective porosity and permeability. Production from the Khuff Formation is mainly gas and condensate with a maximum condensate ratio of 10 BBL/MMSCF. The main gas component is methane which forms more than 75% of the total Khuff gas composition, however appreciable amounts of hydrogen sulphide, nitrogen and carbon dioxide were also recorded in some of the wells. The source of the hydrocarbon gas in the Khuff Formation is not yet well defined; however two sources are postulated: the first is a pre-Khuff source which is probably the Silurian Shales and the second is an indigenous one.
Published Version
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