Microfacies and depositional environment of Shiranish Formation in kirkuk Oil fields north Iraq

Abstract

This study is reveal the characteristics of Shiranish Formation to elucidate the sedimentological properties of Kirkuk Oil fields north of Iraq from wells k-331, k-334, k-411. The studied rocks are consist of limestone, shaley limestone, marly limestone and thin bedded of marl. Facies analysis showed that the exact composition of Shiranish sequences composed of three facies succession of President rich Balmikarait and shells Alforamenavera floating. These facies and depending on popularity are Lime Wackestone Microfacies and Lime Mudstone Microfacies, these facies are divided in turn into secondary facies which Planktonic Foraminiferal Lime Wackestone Submicrofacies (W1), and Bioclastic Lime Wackestone Submicrofacies (W4). Depending on Facies and environmental analysis shows that the composition of sequences have deposited within the basin foreland achieved on the inactive edge Arabian plate and deposited in deep bathyal and out shelf environment