Abstract

The basal part of the Mrar forms the cap rock and possible hydrocarbon source for many of the producing reservoirs in the underlying Tahara sandstones. The Mrar Formation provides a unique opportunity to study a delta system which built out into a slowly subsiding basin and progressively changed from being fluvial to wave dominated. It is considered to provide a valuable model for deltaic systems developed on relatively stable cratonic areas. In particular, the fluvially dominated sequences of the lower Mrar are represented by relatively thin and unusually extensive sheet sandstones preserved within thick prodeltaic shales.--Modified journal abstract.

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