--> Abstract: Depositional Models for South-East Iraq Mishrif Carbonate Platform, by Pierre Masse, Olivier Ridet, and Alain Roumagnac; #90072 (2007)

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Depositional Models for South-East Iraq Mishrif Carbonate Platform

Pierre Masse, Olivier Ridet, and Alain Roumagnac
Total S.A, Pau, France

Available data from South East Iraq Mishrif formation concerns the Buzurgan Fauqi and Abu Ghirab fields, discovered by Elf-Iraq in the early seventies. Other data in the region concerns the Siba field, the Dehluran field at the iranian border, and limited informations on neighbouring fields.
Revisions of the in-house field data were undertaken, to actualize biostratigraphy, sedimentology and sequential stratigraphy interpretations, according to the Sharland et al. framework. This framework will be an up to date basis for further studies in the region.
Third-order sequence SBK120 to SBK130 was identified. Sequence SBK130 to SBK140 is truncated by Late Cenomanien-Early Turonian emersive event. Mishrif deposits are overlaid by SBK150 to MFSK160 deposits (Khasib formation). 87Sr/86Sr datings in this formation give an Early Santonian age.
Within this third-order framework, detailed correlations of nearly twelve wells were proposed. A fifteen facies typology was established, from proximal lagoon to outer ramp depositional environment, and their related petrophysical properties were established. Stacking patterns and biological content help us defining maximum flooding surface and sequence boundaries. Microfaunistic assemblages are used to define bio-events, like Orbitolinids events. Rudists assemblages variations give information on depositional environments of reservoir intervals. Main reservoir facies are made of Rudistid elements. Different models and geometries are described, according to the depositional environments. Recent analogs are used to evaluate the geometries.
Similarities of sequential evolution and facies with some distant field allow us to expect a regional extension of these depositional models.

 

AAPG Search and Discovery Article #90072 © 2007 AAPG and AAPG European Region Conference, Athens, Greece