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Depositional environment of the Najmah Formation (Upper Jurassic) in Bardarash, Erbil, and Hawler oilfields, Kurdistan, Northern Iraq
Hamad, Dler Ali
Hamad, Dler Ali
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Fort Worth, Tex. : Texas Christian University,
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2012
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The Najmah Formation was deposited in the Upper Jurassic (Callovian-Oxfordian) on a shallow basin margin of the Gotnia Basin. At the type locality (well Najmah-29) the thickness of the Najmah Formation is 340.9 m. Sadooni (1997) described several microfacies of the Najmah Formation: oolitic packstone and grainstone, pelletal packstone and grainstone, sponge and sponge spicule-bearing wackestone and packstone, algal boundstone, and foraminiferal wackestone and packstone. The possible depositional setting for identified seismic facies is a uniformly subsiding shelf or stable basin plain in the central and northeastern parts of the study area and a basin margin in the southern and southwestern part of the study area. The northern part of the study area is seismically homogenous wackestone with no internal stratification. The northwestern part of the study area is structurally deformed and no seismic facies can be identified.
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Geological Sciences